200 



PROCEEDINGS OF THE ACADEMY OF 



[May-Oct., 



These specimens were formerly identified by the writer as C. 

 guatemalensis (Morelet). The latter is much larger, diameter 3.5 

 mm., and came from the Michatoya River near Istopa, in southern 

 Guatemala. 



The teeth of the radula have denticles according to the formula 

 -^n^, 2.1.3, 13, CO . Those of the outer uncinus are very minute, 

 not clearly seen. The lateral tooth has the boss and socket structure 

 of the broad body, as in many other Amnicolidae. 



Cochliopa izabal new species. Fig. 6. 



The shell is conic, umbilicate (umbiUcus narrow, rapidly widen- 

 ing in the last half whorl), rather thin; very pale brownish-gray; 

 smooth except for faint traces of spiral striae, a little stronger near 

 the umbilicus and sometimes on the penult whorl. The spire is 

 ele\ated, the early whorls eroded. The whorls are strongly con- 



i^y 



Fig. 6. — Cochliopa izabal. 



vex, the last everywhere rounded. The aperture is moderately 

 oblique, angular above, otherwise rounded. The outer lip is thin; 

 columella concave, thickened, continued in a callus across the pari- 

 etal wall. 



Alt. 1.75, diam. 1.9 mm. Type, fig. 5 a, h. 



Alt. 1.7, diam. 2.15 mm. Fig. 5 c, d. 



Alt. 1.85, diam. '1.5 mm. Fig. 5 e. 



Lake Izabal near Jocolo, Guatemala. 



