342 THARINiE. 



Sub-gen. soleka, Browne (Hypogella, Gray). 



Shell rounded at each end; beaks sub-anterior; anterior 

 adductor impression round. 



obliquus, Spengl. vaginatus, Gray. 



Genus ENSIS, Schumacher. 



Siphons separate, short. 



Shell transversely greatly elongated, gaping and rounded 

 at each end, beaks anterior. Hinge with two teeth in one 

 valve, and three in the other. Anterior adductor scar 

 elongate, horizontal; pallial line with a small, truncate 

 sinus. 



Syn. Ensatella, Swainson. 



Ex. E. ensis, Linnaeus, pi. 92, fig. 2. Shell, E. ensis, 

 fig. 2, a, 2, b. 



This genus is distinguished from Soleti by the number 

 of teeth in the hinge, and by the curved form of the valves. 

 The habits of Ensis are similar to those of Solen. 



Species of Ensis. 



Americana, Beck. pellucida, Pennant. 



ensis, Linn. picta, Phil. 



Gaudichaudii, Chenu. siliqua, Linn. 



macha, Molina. vaginoides, Lam. 

 magua, Schum. 



Sub-fam. PHAEIN^. 



Siphons elongated and separate for more than half their 

 length. Foot more or less ovate. 



