348 



JAMAICA 



CHAP. 



Glandinae, the Helicidae, and the land operculates. The Glan- 

 dinae belong principally to the sub-genera Varicella^ Melia, and 

 Volutaxis^ Streptostyla being absent, although occurring in Cuba 

 and San Domingo. There are 10 genera of Helix, of which 

 Pleiirodonta is quite peculiar, while Sagda (13 sp.) is common 

 only with S.W. San Domingo (2 sp.), and Leptoloma (8 sp.) only 

 with Cuba (1 sp.). The single Strohila seems to be a straggler 

 from a N. American source. Macroceramus has only 2 species as 

 against 34 in Cuba, and of Cylindrella, in which Cuba (130 sp.) 

 is so rich, only 36 species occur. The genus Leia, however (14 

 sp.), is all but peculiar, occurring elsewhere only in the neigh- 

 bouring angle of San Domingo, which is so closely allied with 

 Jamaica. The complete absence of StropJiia is remarkable. 



Fig. 230. — Characteristic Jamai- 

 can and Haitian Mollusca: 

 A, Sagdae pist>jUum Miill., 

 Jamaica; B, Chondroporna 

 salleanum Pfr., San Domin- 

 go; C, Exit ro chat ell a Tan- 

 kervillei Gray, Jamaica ; D, 

 Cylindrella agnesiana C. B. 

 Ad., Jamaica. 



The land operculates form the bulk of the land fauna, there 

 being actually 242 species, as against 221 of land Pulmonata, a 

 proportion never again approached in any part of the world. 

 As many as 80 of these belong to the curious little genus Stoa- 

 stoma, which is all but peculiar to the island, one species having 

 been found in San Domingo, and one in Porto Rico. Geomelania 

 and Chittya, two singular inland forms akin to Truncatella, are 

 quite peculiar. Alcadia reaches its maximum of 14 species, as 

 against 4 species in San Domingo and 9 species in Cuba, and 

 Lucidella is common to San Domingo only; but, if Stoastoyna be 

 omitted, the Helicinidae generally are not represented by so many 

 or by so striking forms as in Cuba, which has 90 species, as 

 against Jamaica 44, and San Domingo 35. 



