MYA. 



65 



Mya arenaria. 



Shell elongated ovate, chalky-white, covered w^ith a thin, wrinkled epidermis ; 

 tooth of equal length and breadth, inclined a little backwards and downwards, 

 with an oblique rib on the back. 



^lya are7mr{a, JjIS., Syst. Nat. p. 1112. — Lister, Conch, t. 419, fiff. 26.3 — Pennant, 

 Brit Zool. iv. 79, t. 42, tig. IC. — Chemn. Conch, vi. 10, t. 1, figs. .3, 4. — Fabu., 

 Faun. Groenl. 405. — Spengler, Skrivt. Nat. Selsk. iii. 30. — Dillwyn, Catal. i. 

 42 — Blainville, Malac. pi. 77, fig. 1. — Sowerby, Gen. of Shells. No. 32. — 

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

 fig. 2. — Desk., Encyc. Meth. Vers, iii 592, pL 229, fig. 1. — La.m. An. sans Vert. 

 (Uesh. ed.) vi. 74. — Maton and Rackett, Liu. Traus. viii. 35. — Turton, 

 Conch. Diet. 98; Brit. Biv. 32. — Do\ov. Brit. Sh. iii. 92, t. 85. — Fleming, Brit. 

 Au. 463. — Conrau, Auicr. Marine Couch. 42, pi. 9, fig. 1; Liu. Traus. viii. 35. 



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

 i.EY, Rec. Sh. 19; Ipsa Liu. Conch. 27. — Fouhes and Hanl., Br. Moll. i. 163, 

 pi. 10, figs. 1, 2, 3, pi. II. fig. 1 (animal). — Reeve, EI. Couch, ii. 158, fig. 229; 

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

 figs. 1, 1 a, 1 6 (anim.). — Ciienu, Man. ii. 31, figs. 128, 129. — Middend. Siber. 

 Reise (Moll.) 108; Beitr. z. Mai. Ros.';. iii. 70, pi. 20, figs. 1-3. -De Kay, ZooU 

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



— Gray, Cat. Bi-. M. (Brit. Moll.) 69. — Moller, lud. Moll. Gr. 17. — Collections 

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



Mij'i mercmaria, Say, Journ. Acad. Nat. Sc. ii 313 (1822). 

 Mya acuta, Say, Ibid. 



Shell ovate, equivalve, nearly cquipartite, moderately thick, gap- 

 ing at both ends, especially at the posterior, which cannot be closed 

 on account of an outward curvature of the valves ; anteriorly short- 

 Fig. 375. 



M. arenaria. 



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

 face wrinkled, and in some 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. 



