CONCHYLIA— Z)/T//y/2J. 55. 245 



Montagu, Test. Brit. p. 36. 

 Musculusex flavo-viridescens. JLister, tnh. 146, fig. 1. 



Mas. n')St. From Oxfordshire. 



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

 both the extremities. From the Mysca Picforiini it differs, in 

 being narrower in proportion 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. 



MvscA tesld antiee subangtdato-acuminald, margine subcoarc- Piciorum. 



tato, nmhonihus 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. hinn. Syst. Nat. p. 1112. 



Gmelin, Syst. p. 3218. 



Tui'ton, Linn. Syst. iv. p. 175. 



Pennant, iv. p. 162, tab. 46, fig. 1. 



Ba 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. 

 Mua. most. In most of our rivers. 



