On the Terrestrial Mollusca of Dominica

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An examination of the New-Brighton skeleton as a whole shows, in the first instance, that it closely resembles in all its principal characteristics that described and figured by Dr. Hector in the Trniisactions of the New-Zealand Institute, with the exception that it has 62 Yertebrs instead of 64 as in the Wellington skeleton. It is, however, possible that there may be some mistake in the number of caudal vertehm of the latter. I have looked carefully over the description of the different species of Balenoptera accessible to me, and find only one, B. sibbaldi, possessing 64 vertebrz, but there are 16 dorsals, or one more than in Dr. Hector's specimen. Till a specimen of this New-Zealand species is obtained, of which the external form can be exactly ascertained, I do not wish to pro- iiounce a decided opinion as to the specific position of Brclcenoptera australis. However, judging from the evidence before us, the skeleton under review resembles so closely in all its osteological peculiarities that of B. muscuhs, that it would be a most remarkable fact if both did riot belong to the same species. 7. On the Terrestrial Mollusca of Dominica, collected By GEORGE FRENCH during a recent visit to that Island. ANUS, F.L.S., C. M. Z. S. [Received November 30, 1883.1 The island of Dominica, lying almost midway between Martinique and Guadaloupe, in about 15' north latitude, is the most lofty of the Lesscr Antilles, some of its peaks rising to an altitude of over 5000 feet. I t is of volcanic formation, and densely wooded, two thirds of the island being still covered by primeval forest. The rainfall averages over 70 inches in the year. 1 was certainly disappointed in finding the number of genera and species of Land-shells so limited, and the forms so small, as, from the favourable conditions of the island for molluscan life, I should have expected a riclier harvest. I give below a list of the species collected by myself during a two months' visit to this beautiful island, being only some 20 in all. IN o P E R c u LATA. SUBUIJNA (STENOGYRA) OCTONA, Chemn. Common in most localities, under stones and decayed leaves. This species appears to have an extended range amongst the West- ZONITES CUNCOLOR, Pkrnssac,= H. baudoni, Petit. Not common, at an altitude of 2000 ft. This species is said to occur also in Porto Rico. India islands, reaching to Mexico and Costa Rica.

Transcript of On the Terrestrial Mollusca of Dominica

Page 1: On the Terrestrial Mollusca of Dominica

An examination of the New-Brighton skeleton as a whole shows, in the first instance, that it closely resembles in all its principal characteristics that described and figured by Dr. Hector in the Trniisactions of the New-Zealand Institute, with the exception that it has 62 Yertebrs instead of 64 as in the Wellington skeleton. It is, however, possible that there may be some mistake in the number of caudal vertehm of the latter.

I have looked carefully over the description of the different species of Balenoptera accessible to me, and find only one, B. sibbaldi, possessing 64 vertebrz, but there are 16 dorsals, or one more than in Dr. Hector's specimen.

Till a specimen of this New-Zealand species is obtained, of which the external form can be exactly ascertained, I do not wish to pro- iiounce a decided opinion as to the specific position of Brclcenoptera australis. However, judging from the evidence before us, the skeleton under review resembles so closely in all its osteological peculiarities that of B. muscuhs, that it would be a most remarkable fact if both did riot belong to the same species.

7. On the Terrestrial Mollusca of Dominica, collected By GEORGE FRENCH during a recent visit t o that Island.

ANUS, F.L.S., C. M. Z. S. [Received November 30, 1883.1

The island of Dominica, lying almost midway between Martinique and Guadaloupe, in about 15' north latitude, is the most lofty of the Lesscr Antilles, some of its peaks rising to an altitude of over 5000 feet. I t is of volcanic formation, and densely wooded, two thirds of the island being still covered by primeval forest. The rainfall averages over 70 inches in the year.

1 was certainly disappointed in finding the number of genera and species of Land-shells so limited, and the forms so small, as, from the favourable conditions of the island for molluscan life, I should have expected a riclier harvest. I give below a list of the species collected by myself during a two months' visit to this beautiful island, being only some 20 in all.

I N o P E R c u L A T A .

SUBUIJNA (STENOGYRA) OCTONA, Chemn. Common in most localities, under stones and decayed leaves. This species appears to have an extended range amongst the West-

ZONITES CUNCOLOR, Pkrnssac,= H . baudoni, Petit. Not common, a t an altitude of 2000 ft. This species is said to occur also in Porto Rico.

India islands, reaching to Mexico and Costa Rica.

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595 1883.1 MOLJ,USCA O F DOMINIC^^.

SUCCINEA APPROXIMANS, Shuttleworth. A small species, of a pale fulvous hue.

Described as coming also from Guadaloupe and Port0 Rice.

SUCCINEA TIGRINA, Lesueur,=Amphihuli?acr: pardelinu, Guppy. A very beautiful hyaline shell, irregularly sprinkled with small

brown spots. My specimens were obtained by negro boys at Laudat (2000 ft.)

and also near the Lihoo River, nestling in the fronds of bananas. One or two were also taken at the base of the falls in the Roseau Valley.

Not abundant, found at an altitude of PO0 or 300 feet.

I t belongs to the group Brachyspira of Pfeiffer.

AMPHIBULIMA PATULA, Brug. This curious species is the type of the genus Ampliibulima of

Blainville. It occurs in company with 8. tigrina amongst the moist stems of the bananas and plantains, ranging, from 2000 feet a t Laudat,

Fig. 1. Shell of Anzph.il,ulimapntuZu with animal, from life; nat. size. 2, 3. Buliinus nicbllsi; nat. size.

to the sea-level. I found a very fine specimen with the animal burrowing in the heart of a pine-apple in a negro clearing not ten yards from the sea. I t was first found at the island of St. Hitts ; and has also been taken in Guadaloupe. I give a figure of the animal from life, which is of a pale greenish yellow, the mantle bordered with orange.

Su CCINEA (OMALONYX) GUADALOUPPNSIS, 'Less. Of this remarkable species I found only a single specimen, alive,

in a damp locality at St. Arament, 200 feet above the sea.

TORNATELLINA (LEPTINARIA) LAMELLATA, Pot. et ptlich., =

Somewhat rare ; nt about 500 feet altitude. Fornatellina antillarum, Shuttleworth.

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5 96 M R . G . F. A N G A S ON THE TERRESTRIAL [Dec. 4,

BULIMUS NICHOLLSI, A . D. Brown, MSS. The discovery of this species is due to the researches of Dr. A.

D. Brown, of New Jersey, U.S.A., who named it in manuscript after our mutual friend Ur. H. A. Nicholls o f Dominica. As, however, he has not given a description of it, I now do so, retaining his manuwript name. It is the largest land-shell hitherto discovered in Dominica, measuririg 1 inch 3 lines in length. I t occurs on the path from Roseau to Rosalie at an altitude of about 2000 feet. I t bears a strong resemblance to some species of the genus PaTtutcl, especially in the expansion and partial thickening of the outer lip. I t is an arboreal species.

Shell rimately perforated, elongately ovate, rather solid, dark olive- brown, filtelJ7 irrregularly longitudinally striated, crossed here and ’there by very thin conceritric lines breaking the longitudinal sculpture, especially on the upper whorls ; spire elevately conical ; sutures im- pressed ; whorls 6-7, flatly convex ; aperture ovate ; outer lip slightly expanded and thickened, paler in colour tban the rest of the shell ; columella triangular, R little thickened and flattened inwards towards the base.

Diani. 7, alt. 10 lines. Nab. Island of Dominica, W. I. BULIMUS (LEPTOMERUS) LILIACEUS, Guildirig, MSS. This pretty species W B S first met with in the island of St. Vincent

by the late Mr. Guilding, who gave it the above MS. name. I t was afterwards described and figured by Reeve in the ‘ Conchologia Iconica.’ I t is rare in Dominica, on trees in the forests at ail altitude of 2000 ft. I t may be at once distinguished by its uniform pale primrose-colour.

BULIMUS (LEPTOMERUS) MULTIFASCIATUS, Lam. On trees a t an altitude of ilbout 2000 ft., very rare.

B u LI M U S ( LE PTOM E T i U s) EXI LIS, Gmelin. This species is very abundant 011 the lower slopes down to the

There are at least three well-marked varieties of the shell, viz :- a. Entirely of R pale fulvous colour. b. With a narrow black band encircling each whorl. c. Tl’itll the base of the last whorl black, and with several broader

1‘1ie shells also vary considerably in their proportions as regards

HELIX (DENTELLARIA) DENTIENS, FBr. This is one of the commonest species of Helix in the island, occur-

ring plentifully in various places from 600 or 800 ft. to the sea-level. Under dead logs, loose stones, and decayed leaves.

sea-level.

bands of the same colour surrounding the whorls.

lengtli a i d breadth. The species is terrestrial in its habits.

HELIX (DENTELLARIA) BADIA, FCr. This species, which is smaller than H. dentiens, is extremely

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1883.1 MOLLUSCA OF DOMINICA. 597

abundant everywhere in the neighbourhood of Roseau, down to the sea-level. I t is terrestrial, and frequents girdens and plantations. There is a variety of a greenish colour with a decided double brown band, but the normal colour of the shell is dark brown throughout. The specimens 1 collected vary much in size. The young shells are um bilicated.

HELIX (DENTELLARIA) NIGRESCENS, Wood. Remarkable for its globular form and strongly marked dentition.

I t is common on the Lake-mountain road, and in various localities above 1000 feet.

HELIX (DENTELLARIA) JOSEPHINA, Fir. This handsomely marked species is common in places above 1500

It occurs also feet. in Martinique and Guadaloupe.

1 met with it in company with H. nigrescens.

VAGINULA OCCIDENTALIS, Guilding. A slug-like creature, without a shell, belonging to the family

I found uiue specimens under dead bark in damp places, not far Veronicellida.

from the sea.

O P E R C u LATA.

CYCLOPHORUS AMETHYSTINUS, Guppy. Mr. Guppy, of Trinidad, has described this species in the ' Annals

of Natural History ' for 1868, but he erroneously calls it a Cyclotus, which it is not, it having a horny operculum, and not a shelly one as in Cyclotus. Above 1200 feet, moderately common.

HELICINA (PACHYSTOMA) RHODOSTOMA, Gray. This beautiful Helicina is found sparingly on the track from

Roseau to Rosalie on the windward side of the island, a t an altitude of about 1500 feet. I t may he at once distinguished from all other species by the vertical spine at the base of the columella. The peristome is sometimes black, sometimes yellow or white, and occasionally of a deep rose-colour.

It is arboreal in its habits.

HELICINA (PACHYSTOMA) FASCIATA, Lam., = H. convexa, Pfr. At an altitude of several hundred feet. Also found at St. Vincent

and Barbadoes ; the Barbadoes specimens are much more brightly coloured and painted. The examples I collected in Dominica vary soriiewhat in size.

HELICINA (IDESA) VELUTINA, Guppy. A small brown species, abundant on all the lower sloi)es, adhering

t o rocks and stones.

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1883.1 ON THE TONGUES 01’ T B R VARSUIIIALS. 599

tions of the body in LucanidE in general. IIe then pointed olit that most of the Lucanissi and Dorcim, unlilze the Odontolahini, differed comparatively little except in size, whereas the latter subfamily muat be regarded as polymcirphic. The variability and plasticity of many Odontolabini was so great, that it was practically impossible to separate them into sharply distinct species. The chitinous por- tions of the male sexual organ were valueless as specific characters in this group.

I n the second, or systematic part of his paper, Dr. Leuthner monographed the three genera Neolucaws, Thorns., Hetrrochthes, Westw., and Odontolabis, Hope, which fcnm the subfamily Odonto- labini, giving full synonymy, and carefully describing the female and the various forms of the male in each species.

This memoir will be published entire in the Society’s ‘ Transac- tions.’

Thc following papers were read :--

1. On the Tongues of tbe Marsupinlia. By EDWAKD B. POULTON, M.A., F.Z.S.

[Received December 18, 1883.1

(Plates LIV., LV.)

I am greatly indebted to the kindness of our Secretary for sup- pljing me from the Society’s collection vith a great part of the materials upon which this paper is written. I have received from him spirit specimens of the tongues of Macropus, Belideus, and Didelphys, and fresh specimens of those of Petrogale and Dasyurus.

Professor Moseley also very kindly gave me excellently prepared tongues of Halmaturiis, Phafangista, and Perameles, and a spirit specimen of Acrobates. l’hese specimens mere obtained in 1874, and are described in the ‘ Xotes by a Naturalist on the Challenger.’ I was also fortunate enough to procure a living specimen of Phalan- gista vulpifia.

I n a previous paper (<‘The Tongue of Perameles nasuta ”) in the ‘ Quarterly Journal of Microscopical Science ’ for January 1883, I described a new type of compound filiform papilla, which I then thought to be peculiar to that animal and modified for the capture of insects. I now find that it is characteristic of the Marsupial tongue, and I propose for it the name “ coronate papilla.” During my work upon this organ I find it absolutely necessary to use new terms in addition to the old ones (which I retaln as far as possible), as these latter do not cover the ground. I therefore add a pro- visional list of the technical terms used in such descriptions as are contained in the present paper.

Circunivallate papille.--lised in Its old sense for the large bulb- bearing papillae (or in some cases ridges) at the hack of the upper

New terms are printed in italics.