History of British animals - University of Guam Marine Laboratory

4*66 MOLLUSCA. MYAD.E. Pandora.Length a quarter of an inch, breadth half an inch ; cuticle brown, wrinkled; truncate anteally ; beaks rather prominent, with the points not quiteopposite, but divaricating from each other ; the elevated tooth running in agradually narrower and wedge-shaped manner, nearly half way along theback margin.583. S. Swalnsonl.— Shell oval, wedge-form, with the concavetooth projecting horizontallyinwards.Turt. Biv. Brit. 37. t. 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, inequilateral;two unequal teeth in each valve.584. P. incequivalvis.— Dorsalfmargin behind, nearly straight;left valve smooth, the right valve concentrically striated.Tellina in. Linn. Syst. Nat. 1118. Don. Brit Shells, t. lxi. 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 extremityrounded ;retral extremity produced and subrecurved ; the left valvealong the dorsal margin angular and incurved. — It appears from the observationof M. Eudes Deslongchamp, that on each side the mouth are two longtentacula, directed retrally ;and that the marginal impression of the cloakconsists of a series of from 15 to 16 rounded muscular markings, two or threeof which are connivent.— Bulletin des Sciences, Fev. 1827, 297-Gen. CXLIII. GALEOMA.— Equivalve, equilateral, transverse;with a large oval gape at the front margin ; hingewithout teeth.585. G. Turtoni. — Tumid in the middle, compressed towardsthe 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 opaquelines beaks ; prominent.