CONCHYLIA— D/rHYE^. 29. 117 



this genus : beaks central, pointed and a little curved, with a small 

 impression under them : hinge with two teeth in each valve, one of 

 them cloven. 



29. STRIGILL A- TUETOiV. 



Testa ovata vel subglobosa, (Equivalvis, clausa, bifaridm arcuato-striatd. 

 Cardo dentibus subbinis, et laterali in utrdque valvd. Ligamentum 

 externum, ad latus longius. 



Shell oval or somewhat globular, equivalve, closed, with striae curv- 

 ing in different directions. Hinge with one or two teeth, and a 

 lateral one in each valve. Ligament external, at the longer side. 



These shells differ from the Tellina, in having the ligament placed 

 on the longer side ; from the Lucina in having lateral teeth ; and 

 from both in the remarkable arched striae with which they are fur- 

 nished, and which we have adopted as a constituent part of their 

 generic character. 



Stkisilla testa ovatd incequilaterali, striis longitudinalibus obliquis camaria. 



hinc fiexuoso-angulosis. 

 Shell oval inequivalve, with oblique longitudinal striae which on one 



side form flexuous angles. 



