﻿Il6 LAMPSILIS 



Uiiio nuvi-cboraci Lea, Tr. Am. Phil. Soc, VI, 1838, p. 104, 

 pi. XXIV, fig-. 114; Obs., II, 1838, p. 104, pi. XXIV, fig. 114. — 

 De Kav, Zool. of N. Y., Pt. 5, 1843, pi. XX, fig. 240. — 

 Chenu, J 11. Conch., 1858, pi. XIX, figs. 5, 5a, 5&. — Kuster, 

 Conch. Cab. Undo, 1861, p. 221, pi, lxxiv, fig. 4. — Sowerby. 

 Conch. Icon., XVI, 1866, pi. xxxyiii, fig. 206. 

 Margarita (Unio) nozd-eboraci Lea, Syn., 1838, p. iq. 

 Margaron (Unio) nozn-eboraci Lea, Syn., 1852, p. 2y ; 1870, 



p. 60. 

 Unio radiatus DeKay, Zool. of N. Y., Pt. 5, 1843, P- ^^9' P^- 



XVII, fig. 236. 

 Unio siibrostratus Kuster, Conch. Cab. Unio., 186 1, p. 203, pi. 

 Lxvii, fig. 3. — Reeve, Conch. Icon., XVI, 1864, pi. xvii, 

 fig. 78. 



Some shells are scarcely rayed, having only a few faint, 

 broken splashes of green. 



Lea places Unio opalinus Anthony (Am. Jl. Conch. II, 1866, 

 p. 145, pi. VII, fig. 2) in the synonymy of the above species. It 

 is an oval, compressed, greenish-yellow shell according to the 

 figure and descrijjtion, and seems to have been injured ante- 

 riorly. I cannot tell what it is. It is credited by Anthony to 

 Michigan. 



Lampsiijs fatua (Lea). 



Shell rather elongated, sometimes long ovate, round before 

 and usually behind, subinflated, subsolid, generally having a 

 rather elevated, but rounded, posterior ridge, with low beaks, 

 which have very irregular, broken, scarcely doubly-looped 

 sculpture ; surface covered with fine, irregiilar growth lines, 

 yellowish-green, feebly or strongly rayed, rays scarcely broken, 

 the posterior end of the shell usually darker than the anterior 

 end ; there are two small, sometimes irregular, subcompressed 

 pseudocardinals in the left valve, and two delicate laterals ; 

 one pseudocardinal and a vestige of a second in the right 

 valve and one lateral ; beak cavities shallow ; anterior scars 

 scarcelv impressed ; posterior scars rather faint ; nacre bluish- 

 white, verv much thickened in front, richly iridescent behind. 



