COCHLIOPA. 59 



Genus COCHLIOPA, Stimpson. 



1. COCHLIOPA ROWELLII, Tnjon. 



Plate 17, fig. 8. 



Shell depressed, wider than high, consisting 

 of 3i whorls, which are regularly convex and 

 rapidly enlarging ; spire small, but little eleva- 

 ted, apex acute, sutures well marked ; base 

 convex, excejDt that the region surrounding the 

 umbilicus is flattened and inclining towards 

 the axis, its outer boundary, consequently, is 

 marked by an angle; umbilicus small, but very 

 distinct ; aperture half ovate, the labrum well 

 rounded and thin, the labium but slightly 

 rounded, thickened, elevated from the body 

 whorl, forming an acute angle with the labrum 

 above, and not impinging on the umbilicus. 

 Color yellowish-green. Operculum paucispiral. 



Alt. 2'5; diam. maj. 4, min. 3 mill. 



Clear Lake, California. 

 (40) 



