88 



BRACHYPODELLA, JAMAICAN. 



The original description is given above. The specimens 

 before me (pi. 8, figs. 52, 53) are narrowly truncate, light 

 brown, sculptured with slightly sinuous, oblique riblets 

 (shown too weak in the lithograph), parted by spaces two or 

 three times their width. The last whorl has a rather strong 

 and stout basal keel, and is distinctly pinched in on both sides 

 of it. The axis is simple and straight. Length 9.6, diam. 2.5 

 mm., whorls 9%. 



It differs from B. angulifera by the far stronger basal 

 carina, more spaced and less regular costulation, brown color 

 and smaller size. The plug is at 8% to 9^ whorls, another 

 whorl persisting above it in the shells examined. It is related 

 to B. dominicensis, but is larger, more closely costulate, and 

 has the last whorl only very shortly free. 



Jamaican Species of Brachypodella. 



All the Jamaican forms, so far as known, are characterized 

 by the very high initial whorl; and the teeth have lost ecto- 

 cones to a greater extent than in Haitian or other forms. 

 The distribution of the species is shown on the following map, 

 prepared by Mr. P. W. Jarvis. 



1. B. alba eos. 



2. B. agnesiana. 



3. B. seminuda. 



4 B. costulata. 



5. B. alba (part) 



6. B. robertsi. 



The area doubly outlined above (3) is that of B. chem- 

 nitziana. 



