MYA. 51 



radiata. 25. Shell ovate, pellucid, finely striated 

 transversely; valves very broad at one end, 

 and narrow at the other. 



Mya radiata. Gmelin, p. 3220. Wood's Conch, p. 109. 

 Mya, No. 1. Schroeter Ehil. ii. p. 614. 

 Mya pictorum tenuis. Chemnitz, vi. p. 23. t. 2. f. 7- 

 Unio. Erie. Method, t. 248. f. 5. 



Inhabits the rivers of Malabar. Chemnitz. 



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

 resembles M. pictorum, but the valves are much broader at 

 one end, and more compressed and brittle ; the colour is 

 green, regularly rayed longitudinally, and decorticated about 

 the beaks ; the primary tooth of the hinge is crenated, and the 

 inside pearly. Lister, t. 152. f. 7. has been generally con- 

 sidered a variety of this species, but is too doubtful to be 

 thus retained, and the same figure is quoted in Solander's 

 MSS. for a variety of Myt'dus modiolus. 



ponderosa. 26\ Shell ovate, ponderous, narrow 

 before, and truncated towards the cartilage- 

 slope ; beaks decorticated. 



Mya ponderosa. Solander's MSS. Portland Cat. p. 143. 



Lot 3170. 

 Mya crassa. Wood's Conch, p. 106. t. 20. and t. 21. 



Inhabits the rivers of China. Humphreys. 



Shell about three and a half inches long, by six broad, and the 

 specimen which Mr. Wood has figured from Mr. Jennings's 

 collection, weighs twenty-two ounces; it is covered with a 

 dark brown epidermis, longitudinally wrinkled in two differ- 

 ent directions; the primary tooth is very strong, and shuts 

 into a corresponding cavity in the opposite valve. 



complanata. 27. Shell ovate compressed, with 

 the front margin straight, and obliquely trun- 

 cated towards the cartilage-slope. Hinge 

 with the primary teeth three-sided and striat- 

 ed. 



Mya complanata. Solander's MSS. Portland Cat. p. 100. 



lot 2190. 

 Mytilus, No. 18. Schroeter Einleitung, ii. p. 458. 

 Lister Conch, t. 150. f. 5. 

 Inhabits rivers in Virginia. Lister. Maryland and New Jer- 

 sey. Solander. Mississippi. Humphreys. 

 e2 



