148 



JAMAICA 



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 

 Pleurodonta 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 neighbour- 

 ing angle of San Domingo, which is so closely allied with Jamaica. 

 The complete absence of Strophia is remarkable. 



Fro. 230. — Characteristic Jamai- 

 can and Haitian Mollusca : 

 A, Sagda epistylium. Aliill. , 

 Jamaica ; B, Chondropoma 

 salleoMum Pfr., San Domingo ; 

 C, Eutrochatella TaMkerrillei 

 Gray, Jamaica ; D, Ci/li)i- 

 (IreUa agnesiana C. B. Ad., 

 Jamaica. 



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

 Ijeing 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 

 l^een found in San Domingo, and one in Porto Eico. Geomelania 

 and Chitty a, two singular inland forms akin to Truncatella, are quite 

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

 4 species in San Dondngo and 9 species in Culia, and Lueidella 

 is common to San Domingo only ; but, if Stoastoma 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. 



