1ft 



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 Stoastoma and 1 of Liicidella^ genera 

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

 fauna of Haiti has been investigated less than those of the 

 neio^hborins^ 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 JRico, with 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, Ctenopoma, Trocha- 

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

 Megalomastoma 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 Yieque are found in Porto Rico, excepting Gho- 

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

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

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

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

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



5. Guadeloupe and Martinique, with Barhuda and the Islands 

 between 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 Cyclophorus, 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. Gyclotus^ with 

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

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

 presented in Martinique, Grenada, and Trinidad. 



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

 the sub-family Licinea, excepting Ghoanopoma^ 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 Gyclostomea, 

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

 this group of islands. The family Selicinacea is represented 



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

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

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



