MY A. 109 



RADIATED GAPER. 



32. Mya radiata. M. testa tequivalvi, pellucida, tenuissime transversim 

 striata, viridi Jlavicanle, livido-radiata ; valvis altero latere latissimis, 

 altero angustissimis. Linn. Gmel. p. 3220. 



Shell of equal valves, pellucid, finely striated transversely, yellowish 

 green with livid rays ; valves very broad on one side, and very narrow 

 on the other. 



Chemn. Conch. 6. t. 2. f. 7. Encyclop. Method, pi. 248. f. 5. 



/3. Musculus latior subfuscus, cceruleis lineis radiatus. List. Conch. 

 t. 152. f. 7. 



This shell has much the habit of the M. Batava, but 

 is broader, thinner, and more fragile. It is of a green 

 colour, decorticated about the hinge, and is regularly- 

 rayed from hinge to margin. The primary tooth of the 

 hinge is crenated ; the inside clay coloured. Inhabits 

 the rivers of Malabar. 



Lister has figured a brownish shell, with blue radiate 

 lines, which appears to be a variety of this species. 



ROUGH GAPER. 



33. Mya rugosa. M. testa ovali, rugosa, extrinsecus virescente, intus 

 rnargaritacea ; cardinis dente primario crenulato, laterali longitudi- 

 nali, alterius duplicate. Linn. Gmel. p. 3222. 



Shell oval, wrinkled, on the outside greenish, within pearly ; primary 

 tooth of the hinge crenulated, lateral teeth long, in one valve double. 

 Chemn. Conch. 10. pi. 170. f. 1649. 



This shell is described only by Chemnitz. It is 

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

 broad. It is prettily wrinkled on the outside, and is 

 found in the rivers on the coast of Coromandel. 



