122 SPECIFIC 



PLATE IV. 



Fig. 1. Hinge of Mya truncal a, 



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 stria?, 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. 



