MYA. 49 



siliqua. 21. Shell thick, strong, gaping; at both 

 ends, and covered with a black epidermis ; 

 hinge without teeth. 



Mya Siliqua. Spengler Cat. Rais. iii. p. 48. Chemnitz, xi. 



p. 192. t. 198. f. 1034. 

 Mya picea. Wood's Conch, p. 06. t. 22. f. 5. 

 Glycimeris incrassata. Lamarck Syst. des Anim. p. 126. 



Found on the shores of North America and Newfoundland. — 

 Spengler. 



Shell about an inch long, and nearly thrice as broad, covered 

 with a very black friable epidermis, and generally decorticated 

 about the hinge ; the inside is of a bluish white, and the ca- 

 vities of both valves are often more or less filled with a de- 

 position of extraneous testaceous matter ; neither of the ends 

 shut close, the hinge is callous, without teeth, and the car- 

 tilage external. 



#*# 



Hinge with Teeth inserted into the opposite 

 Valve. 



batava. 22. Shell sub-oval, rounded at both ends. 



Mya Batava. Maton and Racket in Lin. Trans, viii. 

 p. 57. Wood's Conch, p. 103. t. 10. f . 1 and 2. 



Mya pictorum. Schroeter Fluss. p. 178. t. 3. f. 2. 4. and 5. 

 Chemnitz, vi. p. 19. t. 1. f. 6. Donovan, v. t. 174. 

 Montagu Test. p. 36. 



Mya ovalis. Solander's MSS. 



Unio. Enc. Method, t. 248. f. 3. 



La Moule des Rivieres. Geo fry, p. 141. No. 2. t. 3. 



Lister Conch, t. 146. f. 1. 

 Inhabits the Danube. Lister. Rivers in Germany. Schroeter. 



Holland. Chemnitz. In the Kennet, near Newbury. Mon- 



tagu. 

 Shell about an inch long, and an inch and three-quarters broad, 



of an olive-green colour inclining to brown, and the inside is 



pearly. It differs from M. pictorum, with which it has been 



confounded, in being more rounded, and nearly equally broad 



at both ends. Both these species are used indiscriminately 



by painters to hold their colours. 



pictorum. 23. Shell ovate, with a crenated pri- 

 mary tooth, besides a long lateral tooth in 

 one valve, and two in the other. 



VOL. I. E 



