16 



7. CYCLAS pusilla. Shell obliquely suboval, convex, 

 slightly striate ; the beaks depressed. 



Cyclas pusilla. Turton, Dith.p. 251. t. II. f. 16, 17. 

 Cyclas fontinalis. Drap. p. 130. t. 10. f. 9 13. ? 

 Tellina pusilla. Turton, Diet. 



Shell about the eighth of an inch in diameter ; and 

 differs from C. amnica in its greater convexity, the 

 obscurity of its transverse strise, and in the flatness 

 of the beaks. 



In most streams and brooks. 



