Geographical Distribution of Terrestrial Mollusks. 75 



XII. Note on the Geographical Distribution of the Terrestrial Mol- 

 lusJcs which inhabit the Island of St. Thomas, W. I. 



By T. BLAND. Read March 6, 1854. 



The land shells which are common to St. Thomas and Por- 

 torico are indicated in Mr. Shuttle worth's Catalogue of the 

 species of the former island. H. vortex Pfr. is widely dis- 

 tributed in the West Indies. H. Gundhchi Pfr. is found in 

 Cuba, and H. nemoralina Pet. in St. John. H. enclasta Shuttl., 

 so far as our knowledge at present extends, and perhaps also 

 H. incerta Fer., are peculiar to St. Thomas, the latter only sub- 

 fossil. H. notabilis Shuttl. occurs in St. John, Anegada, and St. 

 Bartholomew. Pfeiffer attributes it (H. lima Fer. var. notabilis) 

 to Curagoa, on the authority of Beck. Bulimus virgulatus (Fer.), 

 and B. Gruadalupensw Brug. inhabit St. John, and have other- 

 wise a wide distribution. B. fraterculus (Fer.) occurs in several of 

 the West India Islands. The Stenogyrce. of St. Thomas are, I 

 believe, widely distributed, none are peculiar to that island. 

 Achatina Gundlachi Pfr. is found in Cuba and Jamaica. Spi~ 

 raxis? ejuncida Shuttl., if really distinct from the Cuba and Flo- 

 rida shells, is at present only known from St. Thomas. Pupa 

 servilis Gould inhabits Cuba, and I believe St. Croix and Ber- 

 muda. Hacroceramus microdon (Pfr.) and Cylindrella pallida 

 (Guild.) occur in St. John, and also Cyclostoma Antillarum Sowb. 

 The latter species is likewise attributed to Tortola and St. Yin- 

 cent. 



I possess C. Newcombianum Ad. from St. John and Tortola, 

 and have received from Portorico a shell which seems scarcely 

 distinguishable from that species. Helicina subfusca Menk. and 

 H.foveata Pfr., occur in St. John. 



It appears, then, that of the twenty -five species of Terrestrial 

 Mollusks, now known on original testimony to inhabit St. 

 Thomas (assuming all enumerated in Mr. Shuttleworth's Cata- 



