246 CONCHYLIA.— 1>/Tflr/M. 55. 



Shell an inch and a quarter long, and nearly three inches broad, 

 narrow oval, covered with a yellowish-green skin, a little flexuous 

 at the anterior side and slightly contracted at the margin near 

 the middle ; inside perlaceous, with often a fawn-colored tint. 



orafa. Mysca testd ovatd, antiie attenuatd, margine suharcuato, nm~ 



bonihus corrugatis. 

 Shell oval, tapering to the anterior end, with the margin slightly 



arcuated, and the beaks wrinkled. 

 Mya ovata. Linn. Trans, viii. p. 39. 



Wood, Conch, p. 105, tab. 19, fig. 5. 

 jDillwyn, Descript. Catal. p. 50. 

 Ttirtou, Conch. Diet. p. 106, 

 Mya ovalis. Montagu, Test. Brit. p. 563. 



Mya depressa. Donovan, British Shells, iii. tab. 101. 

 Musculus angustior. Lister, Conch, tab. 147, fig. 2. 

 Mtis. nost. From the Avon and Froome, Wiltshire. 



Shell an inch and a half long, and two inches and a half broad, 

 covered with a brownish-green skin, much longer in proportion 

 to its breadth than the two last, rather depressed, often radiate : 

 the margin is mostly arched a little outwardly, sometimes con- 

 tracted in the middle, and sometimes with the anterior end 

 slightly falcate; but may be distinguished by its more regularly 

 oval shape. 



loiida. Mysca testd crassd solidd subcylindricd, antice conico-acumi- 

 natd, nmbonibus corrugatis. 

 Shell thick solid and somewhat cylindrical, conically tapering 

 to a point at the anterior end, and the beaks wrinkled. 



4. 



