C0NCHYLIA-Z>/THyi2^. 55. 245 



Montagu, Test. Brit. p. 3Q. 

 Musculus ex flavo-viridescens. Lister, tab. 146, fig. 1. 

 Mus. nost. From Oxfordshire. 



Shell an inch long, and two broad, greenish-brown, rounded at 

 both the extremities. From the Mysca Pictorum it differs, in being 

 narrower in j^roportion to its length, with both the sides nearly 

 equally rounded, and in having no contraction in the front margin : 

 the inside is of a deeper blue tint, and the primary tooth of the left 

 valve is more deeply and distinctly lobed. 



Mysta testa ontice subangulato-acuminatd, margine subcoarctato, um- ' P'*"*"™'". 



bonibus rugoso-verrucosis. 

 Shell somewhat angular and pointed at the anterior side, with the 



margin a little contracted, and the beaks rugged and warty. 

 Mya Pictorum. Linn. Syst. Nat. p. 1112. 



Gmelin, Syst. p. 3218. 



Turton, Linn. Syst. iv. p. 175, 



Pennant, iv. p. 162, tab. 46, fig, I, 



Da Costa, p. 228, tab. 15, fig. 4. 



Wood, Conch, p. 104, tab. 19, fig. 3, 4. 



Linn. Trans, viii. p. 38. 



Dorset Catal, p. 28, tab. 12, fig. 4. 



Dillwyn, Descript. Catal, p. 49. 



Turton, Conch. Diet. p. 106. 

 Mya ovalis. Donovan, British Shells, iii. tab. 89. 



Montagu, Test. Brit. p. 34. 



Turton, British Fauna, p. 146. 

 Mus. nost. In most of our rivers. 



