48 H. B. Preston: New Indian Shells. [Voi.. II, 1908.] 



posterior side somewhat angularly rounded ; lateral margins sloped ; 

 ventral margin rounded, slightly contracted towards the posterior 

 side ; umboes large ; interior of shell purplish white. 



Long. . . . . io"5 mm. 



Lat. .. ..12 



Habitat — Phenchooganj , vSylhet, Assam. 



Allied to C. irawadica ^ Benson, but is more trigonal and more 

 swollen. 



Type in Indian Museum, Calcutta. 



