21 



Mysca Pictorum. Turton, Dith. p. 245. 

 Unio Pictorum. Drap. 131. t.ll.f. 1 — 4. 

 Mya Pictorum. Linn. Gmelin. 



Wood, p. 104. t. 19. f. 3, 4. 



Mya ovalis. Montagu, p. 34. 



Shell an inch and a quarter long, and nearly three 

 inches broad, narrow oval, covered with a yel- 

 lowish-green skin ; a little flexuous at the anterior 

 side, and slightly contracted at the front margin ; 

 inside perlaceous or pale fawn-colour. 



In most clear rivers. ^ 



12. Mysca ovata. Shell oval, tapering to the an- 

 terior end, with the front margin slightly arcuated 

 or contracted ; beaks wrinkled. 



Mysca ovata. Turton, Dith. p. 246. 

 Mya ovata. Wood, p. 105. t. 19./. 5. 

 Mya ovahs. Montagu, p. 5Q3. 

 Mya depressa. Donovan, iii. ^ 101. 



Shell an inch and a half long and two and a half 

 broad, covered with a brownish-green skin, often 

 radiate, rather depressed; the anterior end fre- 

 quently slightly falcate. 



In the Thames, the Avon, and the Froome, 



