﻿436 ANODONTA 



siil>rIionil)()i(l. All, however, have the upcurved posterior ridsjje, 

 the small hut sharp heaks. and the dull, rouyh color, and the 

 rest lines are usualh', thouL'h not always, (juite distinct. I.ea 

 has with his ./. dallasiaiia a number of specimens that I believe 

 are ./. kciniicottii, but a more careful comparison of his type 

 of the former inclines me to believe that it is a near form of 

 f'cf'iliiana and I have accordingly removed it to the synonymy 

 of that species. 



Anodont.v I'KPiNiANA Lea. 



Shell rather small, distinctly rhomboid, subcompressed to 

 subinflated, thin or moderately strong, inequilateral, with 

 slightly elevated, sharp beaks, their sculpture very distinct, 

 doubly-looped, subnodulous ridges ; posterior ridge full, roui;d- 

 ed, ending in a blunt point behind at the hinder base of the 

 shell ; growth lines uneven ; ej>idermis dull, ashy or smoky- 

 green, often quite pale and dark banded ; nacre bluish-white, 

 .sometimes bright. 



Length 55. height 32, diam. 18 mm. 



Length 65, height 34, diam. 20 mm. 



Upper and middle St. Lawrence ; Lake Winnipeg. 



Type locality, Lake Pepin, Portage Co., Ohio. 

 Anodonta pcpinianus Lea, Tr. Am. Phil. Soc . \'L 1838, p. 96, 



pi. XVI, fig. 51 ; Obs., n, 1838, p. 96. pi. xvi, fig. 51. 

 Anodon pepiuiaiius Sowerby, Conch. Icon.. X\'n, 1870, pi. 



XXXVI, fig. 150. 

 Anodonta pcfiniana Clessin, Conch. Cab. Ano.. 1874, p. 158, 



pi. Liii, figs. I, 2. — Simpson, Syn., 1900, p. 647. 

 Mari:,arita (Anodonta) pepiniana Lea, Syn., 1838, p. 30. 

 JSIargaron (Anodonta) pepiniana Lea, Syn., 1852, p. 49; 1870, 



p. 78. 

 Anodonta dalhuiana Lea, Pr. Ac. N. Sci. Phila.. \l\, 1863. ]>. 



T90 ; Jl. Ac. N. Sci. Phila., \'L 1866, p. 29, pi. xi, fig. 28 : 



Obs.. XT, 1863, p. 33, i>l. XI, fig. 28. — Ceessin. Conch. Cab. 



Ano., 1873. p. 107. pi. XXXIII. figs. 3. 4. 

 Mav'^aron (Anodonta) dallasiana Tj-:a, Syn.. 1870, p. yS. 

 Anodonta kcnnicottii (part). Simpsox. Syn., 100:). ]>. 647 



