MYA. 47 



rusty coat of argillaceous earth, which must be removed to 

 discover the real colour of the shell, which is white. 



nitens. 15. Shell oval, striated concentrically; 

 hinge with a single tooth in one valve, which 

 shuts into a deep cleft, between two slight 

 elevations in the other. 

 Mya nitens. Montagu Supp. p. 165. Wood's Conch. 

 p. 101. 

 Inhabits the Scottish coast near Dunbar. Montagu. 

 Length nearly a quarter, and breadth not quite three eighths of 

 an inch ; colour piuk, shaded to white at the shorter end, 

 and regularly marked with concentric striae ; Mr. Montagu 

 says it bears some resemblance to Tellina lata, but besides 

 the dissimilarity in the hinge, it also differs in being more re- 

 gularly oval, and not attenuated at one end. 



prismatica. 16. Shell oblong, attenuated at one 

 end, and obsoletely striated concentrically; 

 hinge with a somewhat spoon-shaped tooth. 



Mya prismatica. Wood's Conch, p. 101. 



Ligula prismatica. Montagu Supp. p. 23. t. 26. f. 3. 



Inhabits the coasts of Scotland and Devonshire. Montagu. 



Shell three eighths of an inch long, and about twice as broad, 

 white, thin, and glossy. The hinge is furnished with a ho- 

 rizontal tooth, having a subtriangular depression for the re- 

 ception of the cartilage, and a minute erect tooth in both 

 valves, besides another remote small lateral tooth in one of 

 the valves. The shell has an irridescent gloss, similar to that 

 of Tellina fausta, from which its trivial name is derived. 



substriata. 17. Shell minute, sub-ovate, with 

 distant obsolete longitudinal striae. 



Mya substriata. Wood's Conch, p. 102. 

 Ligula substriata. Montagu Supp. p. 25. 



Inhabits the coast of Devonshire among corallines in deep 

 water. Montagu. 



Shell about one tenth of an inch in diameter, white, and sub- 

 pellucid. Hinge furnished with a slight projection inwards, 

 and margined so as to form a concavity. 



