MY A. 101 



GLOSSY GAPER. 



20. Mya nitens. M. testa ovata, concentrica, striata ; cardine vnidentato. 



Shell oval, striated concentrically ; hinge with a single tooth. 



Mont. Test. Brit. Suppl. p. 165. Penn. Brit. Zool. 1812. vol. 4. p. 168. 



An oval glossy shell, of a pink and white colour, 

 regularly striated concentrically. The inside is of the 

 same colour as the outside, but not so glossy. The 

 single tooth in one valve shuts into a deep cleft in the 

 other. Length hardly a quarter of an inch ; breadth 

 rather more. 



Mr. Montagu obtained this species from the Scottish 

 coast, near Dunbar, but observes that it is extremely 

 rare. 



PRISMATIC GAPER. 



21. Mya prismatica. M. testa oblonga, alba, anterius rostrata; car- 



dinis dente subcochleariformi. 

 Shell oblong, white, beaked before; hinge with a somewhat spoon-shaped 



tooth. 

 Mont. Test. Brit. Suppl. p. 23. pi. 26. f. 3. (Ligula prismatica.) 



This is a small white shell, three-eighths of an inch 

 long, and twice as broad. It is flat, and thin, and the 

 fore part is produced into a small beak ; the outside is 

 obsoletely striated concentrically, and the inside is 

 smooth and glossy: the hinge, in each valve, has a 

 broad horizontal tooth, besides one which is erect ; and 

 one of the valves has lateral laminae. 



Mr. Montagu, to whom we are wholly indebted for 

 the description of this species, received it from Belton 

 Sands, near Dunbar, in Scotland, and from the sands 

 between Porto Bello and Musselburg. A single valve 

 has also been found on the coast of Devonshire. 



