MY A. OO 



suborbicularis. 35. Shell sub-orbicular, with a 

 single primary tooth in one valve, locking 

 into a double opposite one ; lateral teeth lami- 

 nated. 



Mya suborbicularis. Montagu Test. p. 39- arid p. 564. t. 26. 

 f.6. Maton and Racket in Lin. Trans, viii. p. 41. 

 Wood's Conch, p. 111. 



Inhabits the sea on the coast of Devonshire, often burrowed in 

 lime stone. Montagu. 



Shell rather more than three-eighths of an inch long, and half 

 an inch broad, covered with a brown glossy epidermis, and 

 faintly striated transversely ; it so much resembles Tellina 

 cornea, that it might be easily mistaken for a variety, except 

 attention is paid to the hinge; this also is a marine, whereas 

 the other is a fresh-water species, and the animals are totally 

 different. 



iNiEQUivALvis. 36. Shell somewhat triangular, and 

 the valves very unequal. 



Mya inzequivalvis. Montagu Test. p. 38. t. 26. f. 7. Ma- 

 ton and Racket, in Lin. Trans, viii. p. 40. t. 1 . f. 6. 

 Wood's Conch, p. 113, 

 Corbula. Enc. Method, t. 230. f. 4. 

 Walkers Min. Shells, t. 3. f. 85. 



Inhabits the coasts of Britain, not uncommon. 



The lower valve is about three-eighths of an inch long, and 

 half an inch broad, but the upper valve is much smaller as 

 well as flatter ; — it is a strong, thick, concentrically striated 

 shell, frequently covered with a brown epidermis, and when 

 closed, the margin of the under valve projects considerably 

 over the upper ; the beaks are central, prominent, and stand 

 high above the hinge, which is furnished with one strong 

 somewhat recurved tooth, shutting into a notch in the oppo- 

 site valve. 



labiata. " 37. Shell sub-oval, with the valves shut- 

 ting very close, and the margin of one valve 

 projecting like a lip. 



Mya labiata. Maton in Lin. Trans, x. p. 326. t. 24. f. 1 

 to 3. Wood's Conch, p. 112. 

 Inhabits rivers in South America. Maton. 

 The specimens figured by Dr. Maton, appear about half an 



inch long, and nearly twice as broad ; shell nearly oval, but 



