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Show 1883.] MOLLUSCA OF DOMINICA. 597 abundant everywhere in the neighbourhood of Roseau, down to the sea-level. It is terrestrial, and frequents gardens 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 I collected vary much in size. The young shells are umbilicated. HELIX (DENTELLARIA) NIGRESCENS, Wood. Remarkable for its globular form and strongly marked dentition. It is common on the Lake-mountain road, and in various localities above 1000 feet. HELIX (DENTELLARIA) JOSEPHINA, Fer. This handsomely marked species is common in places above 1500 feet. I met with it in company with H. nigrescens. It occurs also in Martinique and Guadaloupe. VAGINULA OCCIDENTALIS, Guilding. A slug-like creature, without a shell, belonging to the family Veronicellida. I found nine specimens under dead bark in damp places, not far from the sea. OPERCULATA. 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, aud 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, at an altitude of about 1500 feet. It is arboreal in its habits. It may be 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. HELICINA (PACHYSTOMA) FASCIATA, Lam., - H. convexa, Pfr. At an altitude of several hundred feet. Also found at St. Vincent and Barbadoes ; the Barhadoes specimens are much more brightly coloured and painted. The examples I collected in Dominica vary somewhat in size. HELICINA (IDESA) VELUTINA, Guppy. A small brown species, abundant on all the lower slopes, adhering to rocks and stones. |