﻿154 i,\Ml'SlIJS 



ner beliind, where it is usually iridescent. The male shell is 

 short elliptical or subrhomboid. the blunt, roumled posterior 

 point being- at or below the middle of the height of the shell. 

 Tlic female shell is shorter and a little more inflated ; it has a 

 decided ang-ular marsupial swelling- at the posterior base, and 

 the posterior point is elevated two-thirds of the way up from 

 thd base of the shell. 



Length (male) 36, heig-ht 24, diam. 17 mm. 



Length (female) 32, heigfht 24, diam. 18 mm. 



Ohio River drainage; Warsaw, Indiana; (probably St. Law- 

 rence drainage); southern Michigan; White River, Carroll 

 County, Arkansas (Call) ; Etowah River, Georgia. 



Type locality, Ohio River. 

 Unio glans Lea, Tr. Am. Phil. Soc, 1834, p. 82, pi. xviii, fig-. 



12 ; Obs.. I, 1834, p. Q2, pi. VII r, fig. 12. — Conrad, Monog., II, 



1836, p. 21, pi. IX, fig. 2. — Han LEY, Biv. Shells, 1843, P- 19^, 



pi. XXII, fig. 33. — KusTER, Conch. Cab. L^nio, 1852, p. 37, 



pi. VI, fig. 3. — Chenu, 111. Conch., 1858, pi. viii, figs. 9, ga, gb. 



— SowERBY, Conch. Icon., XVI, 1866, pi. xxxvi, fig. 190. 

 Margarita (Unio) glans Lea, Syn., 1836, p. 28; 1838, p. 21. 

 Margaron (Unio) glans Lea, Syn., 1852, p. 31 ; 1870, p. 49. 

 Lampsilis glans Simpson, Syn., 1900, p. 565. 

 Burynia (Cariinculina) glans Ortmann. Ann. Car. Mus., 

 VIII, 1912, p. 339. 



This species is usually quite distinct from all others. It is 

 shorter, solider and more inflated than gerniana and diflfers 

 in having a purple nacre : it is -very much shorter than cylin- 

 drella and the female is shaped differently from either of the 

 above species. Occasional shells have a whitish nacre. 



Lampsilis germ ana (Lea). 



Shell long elliptical or a little rhomboid, that of the female 

 slightly obovate, subsolid, subcompressed to subinflated, with a 

 rounded posterior ridge and small, somewhat compressed, but 

 rather elevated beaks, their sculpture not seen; surface finely 

 concentrically sculptured, rayless, covered with a black or 

 brown, thick epidermis ; left valve with two rather ragged, com- 



