CUBAN SUBFAMILY CHONDROPOMINAE — TORRE AND BARTSCH 343 



argue for such a restriction. For this reason we now restrict the 

 typical form to the Sierra Casas race. 



Sr. Chiquitd 



FiGUEB 100. — Distribution of the subspecies of Ohondropotna (Ohondropoma) vespertinum: 

 (1) bibijag-uense; (2) caiallosense J (3) colombense; (4) vespertinum. 



In this subspecies the dark forms prevail ; it is stouter than C. (C.) 

 vespertinum colonibeme but less so than C. {C.) vespertinum cabal- 

 lo sense. 



The specimen figured, U.S.N.M. no. 493139, has a little more than 

 4 whorls remaining and measures: Length, 19.1 mm; greater diameter, 

 10.3 mm ; lesser diameter, 8.8 mm. 



It comes from immediately behind Nueva Gerona. Specimens from 

 the southern end of the range are not differentiated. 



CHONDROPOMA (CHONDROPOMA) VESPERTINUM CABALLOSENSE, new subspecies 



Plate 30, Figure 13 



Shell larger, a little thinner, and paler than C. {€.) vespertinum 

 vespertinum^ which renders the interrupted spiral bands more con- 

 spicuous. 



