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 margin. 
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. CXLII. PANDORA. — Shell inequivalve, inequilate- 
ral ; two unequal teeth in each valve. 
584. P. incBqulvalvis. — Dorsalfmargin behind, nearly straight; 
left valve smooth, the right valve concentrically striated. 
Tellina in. Linn. Syst. Nat. 1118. Don. 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 ; Jfche 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. 
