168 MYAD.T.. 



the Mull of Galloway, in about 145 fathoms of water. 

 Mr. M' Andrew has taken them in 100 fathoms water, 

 twenty-five miles to the east of Zetland. 



This species is not rare in the fossil state ; a variety 

 with the posterior end extremely short, is the most fre- 

 quent fossil form, and still lives in Greenland and the seas 

 of Boreal America, This is the Mya UddemUensis of some 

 authors, examples of which, (but whether recent or fossil 

 is uncertain,) surmised to have been brought from a shell- 

 bank lying about twenty-five miles to the east of Fern 

 Islands, were procured by Mr, King from some Northum- 

 brian fishing-boats. (Ann. N. H. 18, p. 236.) As a British 

 species, Mya truncata dates from the epoch of the coral- 

 line crag. 



M. AKENARIA, LiuuroUS. 



Ovate-oblong, subequilateral, not tumid, merely marked with 

 concentric wrinkles of growth, rounded anteriorly, tapering pos- 

 teriorly to a blunted point. 



Plate X. f. 4, 5, 6. 



Ml/a arenaria, LiNN. Syst. Nat. ed. 12, p. 1112. — Penn. Brit. Zool. ed. 4, vol. 

 iv. p. 79, pi. 42, f. 16.— DoNov. Brit. Shells, vol. iii. pi. 8.5. 

 — Mont. Test. Brit. p. 30. — Linn. Trans, vol. viii. p. 35. — 

 Dorset Catal. p. 28, pi. 4. f. 2. — Turt. Conch. Diction, p. 9ii. 

 — TuKT. Dithyra Brit. p. 32.— Flem. Brit. Anim. p. 463. 

 — Macgil. Moll. Aberd. p. 298. — Brit. Marine Conch, p. 40. — 

 Brown, 111. Conch. G. B. p. 1 1 1 , pi. 45, f. 1.— 0. Fabr. Fauna 

 Graenl. p. 405. — Chemn. Conch. Cab. vol. vi. p. 10, pi. ],f. 

 .3, 4. — Spengl. Skrivt. Naturh. Selskab. vol. iii. part 1, p. 30. 

 Wood, General Conch, p. 91, pi. 17, f. 3. — Dillw. Recent 

 Shells, vol. i. p. 42.— Lam. Anim. s. Vert. ed. 2, vol. vi. p. 74. 

 — Index Testae, pi. 2, Mya, f. 2. — Ma we, Conchologj', pi. 

 4, f. 1. — SowERBV, Genera Shells. — Blainv. Man. Malac, 

 pi. 77, f. 1. — Reeve, Conch. System, pi. 33.— Conrad, Anier. 

 Mar. Conch, p. 42, pi. 9, f. 1. — Gould, Invert. Massach. p. 

 40.— Hanl. Recent Shells, p. 19.— Dekav, New York Moll. p. 

 240, pi. 30, f. 290. 



