466 MOLLUSCA. MYAD^. Pandora. 



Length a quarter of an inch, breadth half an inch ; cuticle brown, wrink- 

 led ; truncate anteally ; beaks rather prominent, with the points not quite 

 opposite, but divaricating from each other ; the elevated tooth running in a 

 gradually narrower and wedge-shaped manner, nearly half way along the 

 back mai'gin. 



583. S. Swainsoni. — Shell oval, wedge-form, with the con- 

 cave tooth projecting horizontally inwards. 



Turt. Biv. Brit. 37- 1. iii. f. 3. t. xix. f. 2 — ^In rocks, Torbay. 

 Length a quarter of an inch, breadth half an inch ; rounded retrally. 



Gen. CXLIl. PANDORA. — Shell inequivalve, inequilate- 

 ral ; two unequal teeth in each valve. 



584. P. incBquwalvis. — Dorsalmargin behind, nearly straight; 

 left valve smooth, the right valve concentrically striated. 



Tellina in. Linn. Syst. Nat. 1118. Do7i. Brit Shells, t. Ixi. Mont. Test. 



Brit. 75- ib Solen pinna, ib. 566. t. xv. f. 3.— P. margaritacea, Turt. 



Biv. Brit. 40. t. cxi. f. 11, 12, 13, 14 — English shores, rare. 



Length half an inch, breadth an inch ; oblong, white, glossy ; anterior ex- 

 tremity rounded ; retral extremity produced and subrecurved ; the left valve 

 along the dorsal margin angular and incurved. — It appears from the observa- 

 tion of M. Eudes Deslongchamp, that on each side the mouth are two long 

 tentacula, directed retrally ; and that the marginal impression of the cloak 

 consists of a series of from 15 to 16 rounded muscular markings, two or three 

 of which are connivent. — Bulletin des Sciences, Fev. 1827, 297. 



Gen. CXLIII. GALEOMA. — Equivalve, equilateral, trans- 

 verse ; with a large oval gape at the front margin ; hinge 

 without teeth. 



585. G. Turtoni. — Tumid in the middle, compressed to- 

 wards the extremities, which are rounded and closed. 



Turt. Zool. Journ. No. 7- 364. t. xiii. f 1 — English Channel 

 Length two lines and a half, breadth not quite half an inch ; dirty white, 

 the surface covered with close set, irregular transverse interrupted opaque 

 lines ; beaks prominent. 



