122 SPECIFIC- 



PLATE IV. 

 Fig. I. Hinge of Mya truncata. 



Fig. 2. Mya truncata. 



Shell ovate, truncate on the posterior margin, 

 tooth of the hinge projecting forwards and very 

 blunt. 



Lister Conch, tab. 428. fig. 269. 



Specimen dirty white, clothed with a yellowish 

 brown epidermis which extends beyond the trun- 

 cate side ; thick, convex, deeply marked with ir- 

 regular, transverse striae, gaping widely at the 

 truncated end, very smooth within. Solitary broad 

 tooth of the hinge connected with the opposite 

 valve by an interior cartilage. 



Inhabits the English coast. 



Fig. 3. ITiNGE of SoLEN Vagina^ 



Fig. 4. ^ouE^ Ensis. 



Shell linear, rather curved; hinge with two teeth 

 in one valve, and one locking between them in tho 

 other. 



Lister Conch, tab. 411. fig. 25/. 



