MYA. 



65 



My a arenaria. 



Shell elongated ovate, ehalky-wliite, covered with a thin, wrinkled epidermis ; 

 tooth of equal length and l^readth, inclined a little backwards and downwards, 

 witli an oblique rib on the back. 



Mya nrenaria, Lin., Syst. Nat. p. 1112. — Lister, Conch, t. 419, fig. 263 — Pennant, 

 Brit Zoo!, iv. 79, t. 42, tig. 16. — Chemn. Conch, vi. 10, t. 1, fig:^. 3, 4. — F.\I!R., 

 Faun. Gra-nl. 405. — Spenglee, Skrivt. Nat. Selsk. ill. 30. — Dillwyn, Catal. i. 

 42 — Bl.\inville, Malac. pi. 77, fig. 1. — Sowerby, Gen. uf Shells. No. 32. — 

 Montagu, Test. Brit. 30. — Wood, Gen. Conch. 91, t. 17, fig. 3; Index, pi. 2, 

 fig. 2. — Desk., lilncyc. Me'th. Vers, iii .592, pi. 229, fig. 1. — Lam. An. sans Vert. 

 (Desh. cd.) vi. 74. — Maton and Kackett, Lin. Trans, viii. 35. — Turton, 

 Conch. Uict. 98; Brit. Biv. 32. — Donov. Brit. Sh. iii. 92, t. 85. — Fleming, Brit. 

 An. 463. — Conrad, Amcr. Marine Conch. 42, pi. 9, fig. 1 ; Lin. Trans, viii. 35. 

 — Brown, Conch. IH. Gr. Brit. 111. pi. 45, fig. 1 ; Mar. Conch. pL 4, fig. 1. — Han- 

 ley, llec. Sh. 19; Ipsa Lin. Conch. 27. — Forhes and Hanl., Br. MolL i. 163, 

 pi. 10, figs. 1, 2, 3, pL II. fig. 1 (animal). — Reeve, El. Conch, ii. 158, fig. 229; 

 Conch. Syst. pi. 33. — Mawe, Conch, pi. 4, fig. 1. — Adams, Gen. ii. 353, pi. 95, 

 figs. 1, la, 16 (aniin.). — Cuenu, Man. ii. 31, figs. 128, 129. — Middend. Siber. 

 Reise (MolL) 108; Beitr. z. Mai. Ross. iii. 70, pL 20, figs. 1-3. -De Kay, Zooh 

 New York, 240, pi. 30, fig. 290. — Woodw., Man. of Midi. 244, fig. 170 (anim.). 

 -Gray, Cat. Br. M. (Brit, Moll.) 69. — Moller, lad. Mod. Gr. 17. — Collections 

 Mass. Hist. Soc. viii. 193 (1802). 



3f>/ii mercenaria. Say, Journ. Acad. Nat. Sc. ii 313 (1822). 



Mija acuta, Say', Ibid. 



Shell ovate, cqiiivalve, nearly equipartite, moderately thick, gap- 

 ins; at both ends, e8i)ccially at the posterior, which cannot l)e closed 

 on acconnt of an ontward curvatnre of the valves ; anteriorly short- 

 Fig. 375. 



M. arenaria. 



est and regularly rounded ; posteriorly narrowed and rounded ; sur- 

 face wrinkled, and in sonic parts raised into ridges at the lines of 

 growth; faint radiating lines and colors depart from the beaks; 

 color dingy white, covered with a very thin, dirty-brown e])idermis, 



