MYA. GAP EH. 103 



Shell somewhat oval, rather convex, white, but mostly 

 covered with a thick tough rust-colored skin, obscurely 

 wrinkled transversely ; inside white, glossy : the front mar- 

 gin nearly straight : beaks obtuse, placed nearer to one 

 end : hinge with two projecting teeth separated by a large 

 triangular cavity, one of them erect, the other turning in- 

 wards and sloping downwards : length about a quarter of 

 an inch j breadth nearly half an inch. 



Belton sands, Scotland 5 and Dublin bay. v. 91, 



13. Mya nitens. Glossy Gaper. 

 Laskey, Wern. Soc. i. pi. 8. f. 4. 



Shell oval, glossy white, growing pink towards the 

 beaks, with regular concentric striae ; inside colored in like 

 manner, but not so glossy : beaks rather prominent, but not 

 /quite central : hinge with a single tooth in one valve, lock- 

 ing into a deep cleft between two slight elevations in the 

 other : length nearly a quarter of ar^ inch ; breadth some-, 

 thing more. 



Dunbar, and Dublin bay : rare. ^?. m. 



14. Mya prismatica. Prismatw Gaper* 

 Montagu, pi. 26. f. 3. 



Shell oblong-oval, flat, thin, glossy white reflecting pris- 

 matic colors in various positions of light, rounded at one 

 <?nd and sloping to a point at the other, obscurely striate 

 concentrically ; inside smooth, glossy : beaks small, nearer 

 to and pointing towards the elongated end : hinge with a 

 broad horizontal tooth, and an erect one, and a somewhat 

 triangular depression in both valves ; in one valve is also a 

 small lateral plate which is wanting in the other : length 

 three eighths of an inch ; breadth as much again. 



On the Scotch coasts, and at Exmouth. v. v. 



15. Mya substriata. Substrlated Gaper. 

 Montagu, Snppl. p. 25. 



Shell somewhat oval, semitransparent, white, with ob- 

 scure distant raised longitudinal lines ; inside smooth, with 

 a plain margin : beaks prominent, straight : hinge with a 

 single projection inwards, margined so as to make it con- 

 cave : diameter the tenth of an inch. 



Devon coast, among Corallines : rare. 



16. Mya 



