CUBAN SUBFAMILY CHONDROPOMINAE — TORRE AND BARTSCH 265 



between them are more or less squarish or rectangular shallow pits. 

 This sculpture holds good also for the base, except that here the 

 axial threads become a little more approximated and the spiral lira- 

 tions are a little stronger. Aperture broadly ovate; peristome dou- 

 ble, the inner slightly excavated, reflected and adnate to the outer, 

 which is very broadly flaringly expanded, slightly fluted and marked 

 by slender concentric lamellae. The outer peristome on the inner 

 lip is reflected in its middle to form a fold, not cut. Posterior to this 

 it is reflected over the base so as to almost close the umbilicus, leav- 

 ing only a narrow chink. On the parietal wall the inner lip extends 

 partly on the base and forms somewhat of an auricle at its junction 

 with the outer lip at the posterior angle. 



The type, U.S.N.M. no. 10981, was collected by Wright at La Guira, 

 a place east of the Sierra San Carlos. It has 4.3 whorls remaining 

 and measures: Length, 27.4 mm; greater diameter, 17.8 mm; lesser 

 diameter, 12.6 mm. 



Figure 8S. — Distribution of tlie species and subspecies of Foveothyra: (1) C. (F.) foveata 

 foveata; (2) foveata toroensisj (3) cumbrensis cumbrensis ; (4) cumbrensis catharina; 

 <5) natensoni. 



Foveothyra, new subgenus 



Shell like Cho7iodrothyra, but with the posterior part of tlie outer 

 peristome of the inner lip punched into the umbilicus, thus forming 

 here a decided pit. 



Type: Chondrothyra {Foveothyra) foveata (Gundlach) Pfeiffer. 



Distribution of the species and subspecies of the subgenus Foveo- 

 thyra is shown in figure 88. 



KEY TO THE SPECIES OF SUBGENUS FOVEOTHYRA 



Shell more than 23.0 mm in length foveata 



Shell less than 15.0 mm in length natensoni 



Shell 16-19 mm in length cumbrensis 



