﻿l8o I.AMl'SII.IS 



Mexico ; no special locality is recorded with certainty. 1-he 

 habitat, J.ake Chalco in the State of Mexico, given by Say, is 

 very niucli doubted by Fischer and Crosse. 

 Unio mrtalliciis Say, N. Harm. Disseminator (newspaper 



form), January 15, 1S31,; Am. Conch., VI, 1834. 

 Latiipsilis mctallicns Simpson, Syn., 1900, p. 572. 

 Unio cit prill us LtlA, Tr. Am. Phila. Soc, IV^ 183 1, p. 94, pi. 



XII, fig. 24; Obs., I, 1834, pi. xii, fig. 24. — Hanley, Biv. 



Shells, 1843, p. 208, pi. XXII, fig. 7. — Chknu, 111. Conch., 



1858, pi. XI, figs. 3, 3a, 35. — SowiiRBY, Conch. Icon., XVI, 



1868, pi. Lxvi, fig. 336. 

 Margarita (Unio) cuprinus Lea, Syn., 1836, p. 39; 1838, p. 25. 

 Margaron (Unio) cuprinus Lea, Syn., 1852, p. 38; 1870, p. 61. 

 Unio crreiis Reeve, Conch. Icon., X\'I, 1856, pi. xxx, fig. 160. 



A beautiful little species with a shining, coppery epidermis 

 and a rich metallic nacre, which cannot be mistaken for any 

 other. 



Var. ganiiia i'ilsbry. 



"The shell resembles L. metallica (Say) {Unio cuprinus Lea) 

 in general appearance, buit is constantly smaller, more com- 

 pressed and more reniform. Near the beaks there are green 

 rays on a i>alc ground, the rest of the valve being brownish- 

 black. 



Length 47, height 25, diam. 13^ mm. 



Length 47' 2, height 265^, diam. 16 mm. 



Length 39, height 21, diam. 13 mm." (Pilsbry.) 



Type locality, Oanina River, three miles southwest of San 

 Dieguito, Mexico. 

 Lampsilis metallica ganina Pit.srry, Pr. .Ac. N. Sci. Phila., 



1(709. p. 539. ])1. XXVII, fig. 6. 



Var. subventralis (von Martens). 



"Ventral margin distinctly convex. \'ertices in 2/9 long. 



Length 55, alt. vert. 29, ala? 29, diam. 18 mm. 



Type locality. Southeast Mexico : Tabasco." (von Martens.) 

 Unio cuprinus subventralis von Martens, Biol. Cent. .\mer. 



Moll.. 1900. p. 506, pi. xxxvi, figs. I, la, lb. 



