MY A. 



55 



My a arenaria. 



Shell elongated ovate, chalky-white, covered with a thin, wrinkled epidermis ; 

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

 with an oblique rib on the back. 



M>ja arenaria, Lin., Syst. Nat. p. 1112. — Lister, Conch, t. 419, lig. 26.3 — Penxant, 

 Brit Zool. iv. 79, t. 42, fig. 16. — Chem.n. Conch, vi. 10, t. 1, tigs. 3,4. — Fahu., 

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

 42 — Blain'ville, Malac. pi. 77, fig. 1. — Sowerby, Gen. of Shells. No. 32. — 

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

 fi--. 2. — Desh., Encyc. Meth. "Vers, iii 592, pi. 229, fig. 1. — Lam. An. sans Vert. 

 (Dcsh. cd.) vi. 74. — Maton and Rackett, Lin. Trans, viii. 35. — Turton, 

 Conch. Diet. 98; Brit. Biv. 32. — Doxov. Brit. 81i. iii. 92, t. 85. — Fleming, Brit. 

 An. 463. — Conrad, Anicr. ]\huiue Condi. 42, pi. 9, fig. 1; Lin. Trans, viii. 35. 



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

 ley, Rec. Sh. 19; Ipsa Lin. Conch. 27. — Forre.s and Hanl., Br. Moll. i. 163, 

 pi. 10, figs. 1, 2, 3, pi. H. 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 (anim.). — CiiENU, Man. ii. 31, figs. 128, 129. — Middend. Sibcr. 

 Reise (Mod.) 108; Bcitr. z. Mai. Ross. iii. 70, pi. 20, fig.s. 1-3. — De Kay, ZooL 

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



— Gray, Cat. Br. M. (Brit. Moll.) 69. — Moller, Iiul. xMoll. Gr. 17. — Collections 

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



Mij I merccnaria, Say, Journ. Acad. Nat. Sc. ii 313 (1822). 

 Ml/a acuta, Say, Ibid. 



Shell ovate, equivalve, nearly equipartite, 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- 



FiK. 375. 



i\I. 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 epidermis, 



