16 



7. Cyclas 'pusilla. Shell obliquely suboval, convex, 

 slightly striate ; the beaks depressed. 



Cyclas pusilla. Turton, Dith.p. 251. ^.11./. 16, 17. 

 Cyclas fontinalis. Draj^. p. 130. t. 10./. 9—13. ? 

 TeUina pusilla. Turton, Diet. 



Shell about the eighth of an inch in diameter ; and 

 differs from C. amnka in its greater convexity, the 

 obscurity of its transverse striae, and in the flatness 

 of the beaks. 



In most streams and brooks. 



