142 AMERICAN JOURNAL 



and Chondropoma (absent in Jamaica), Haiti has more relation- 

 ship with Cuba than with Jamaica ; but alliance with the latter 

 is shown by 1 species of Stoastomu and 1 of Lucidella^ genera 

 not present in Cuba, I should remark that the land shell 

 fauna of Haiti has been investigated less than those of the 

 neighboring islands, and that further research is much to be 

 desired. It is probable that the islands of the Bahamas group, 

 nearer to Haiti than to Cuba, will, on close examination, be 

 found to have as much, if not more, relationship with the for- 

 mer than the latter * 



4. Porto Rico^ ivith Vieque and the Virgin Islands, including 

 also Anguilla, St. Martin^ and St. Bartholomew. — There is not 

 only no peculiar operculated genus in this group of islands, 

 but several of the genera represented in the three preceding 

 sub-provinces are wanting, viz., Gyclotus, Gtenopoma, Trocha- 

 tella, and Lucidella. This sub-province, having species of 

 Megaloniastoma and Chondropoma, genera not found in Jamai- 

 ca, has, on the whole, less alliance with that island than with 

 Cuba and Haiti. There is no species common to the Con- 

 tinent and this sub-province, but several species are widely 

 distributed in the islands comprised in it. All the species 

 which inhabit Vieque are found in Porto Eico, excepting Cho- 

 anopoma sulculosum, Fer., belonging also to St. Bartholomew. 

 Several species are common to Porto Eico, St. Thomas, and 

 St. John. The only species found in another sub-province is 

 Helicina fasciata. Lam., which is attributed to St. Kitts, Gua- 

 deloupe, and one or two other islands of the same group. 



5. Guadeloupje and Martinique, tvith Barhuda and the Islands 

 betiveeri it and them, and also Islands to the south^ to and inclu- 

 sive of Trinidad. There is no operculated genus absolutely 

 peculiar to this group of Islands, but Cyclop] torus, not found 

 in the other sub-provinces, has 2 species in Guadeloupe, and 

 4 in Martinique ; on the continent, there are 3 in Mexico, 3 

 in Central America, and 8 in South America. Cyclotus., with 

 16 of the 22 continental species in South America, and which 

 inhabits Cuba, Jamaica, and Haiti, but not Porto Eico, is re- 

 presented in Martinique, Grenada, and Trinidad. 



In this sub-province, Megalomastoma and all the genera of 

 the sub-family Licinea, excepting Choanopoma.^ which has 1 

 species only, are absent. On the Continent, Adamsiella alone 

 of that sub-family is represented, and by 2 species, 1 in Central 

 and the other in South America. The family Cychstomea, 

 which has 1 continental species (in Mexico), has 3 species in 

 this group of islands. The family Helicinacea is represented 



* I learn from my friend, Mr. D. Sargent, of Great Inagua, that seveial 

 years ago an alligator landed from a log of mahogany, and lived some time 

 on that island— a colonist, it was supposed, from Haiti. 



