CONCHYLIA— XHTHYliA 6. 25 



HiATELLA testa latere postico rotundato areola nulla, antico subangu- oblonga 



lata hiante. 

 Shell rounded at the hinder end without impression, truncate and 



somewhat angular at the anterior. 



Tab. nost. 2, fig. 13. 

 Mus. nost. From rocks in Dublin bay and Torbay. 



Shell three-eighths of an inch long, and about an inch broad, 

 oblong, whitish, transversely striate, rounded at one end, somewhat 

 truncate and much open at the other; the valves rather unequal, 

 with an obscure, oblique, and nearly smooth angle from the beaks to 

 the anterior end : beaks prominent : teeth as in the last. 



The specimens which we have collected, both in Ireland and 

 Torbay, preserve the regular distinction of having the hinder ex- 

 tremity well rounded and without impression, and the anterior much 

 ^■iping, with the beaks not terminal, and the transverse angles 

 rather obscure, and generally smooth. 



6. VEimCOLA— LAMARCK. 



Testa subtransversa, (squivalvis, inaquilateralis, latere antico hiante. 

 Cardo dentibus duobus inter tres penetrantibus : lateralibus nullis. 

 Ligamentum externum. 



