134 SPECIFIC 



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 5 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. Hinge of Solen vagina. 



Fig, 4. Solen ensis. 



Shell linear, rather curved; hinge with two teeth 

 in one valve, and one locking between them in the 

 other. 



Lister Conch, tab. 411. fig, 257. 



Specimen white, marked with blueish flesh-co- 

 loured streaks and spots, striated transversely in 

 such a manner as that towards the anterior side the 

 shell appears divided into two triangular compart- 



