LAMELT.mENS 1 175 



and having a somewhat metalHc kister ; teeth very dehcate, 

 compressed ; laterals straight ; nacre bluish, iridescent. 



Length 54, height 26, diam. 14 mm. 



India ; Burma ; Pegu. 

 Unio corrianus Lea, Tr. Am. Phil. Soc. \'L 1834, p. 65, pi. 



IX, fig. 25; Obs., I, 1834, p. 177. pi. IX, fig. 25.— HanlEy, 



Biv. Shells, 1843, p. 207, pi. xx, fig. 60. 

 Margarita (Unio) corrianus Lea, Syn., 1836, p. 38; 1838, p. 25. 

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

 LameUidens corrianus Simpson, Syn., 1900, p. 857. 

 LamcUidcns marginalis var. corrianus Preston, Rec. Ind. Mus., 



VII, 1912, p. 304. 



A very delicate, highly polished species, the epidermis hav- 

 ing a somewhat metallic or bronzy luster. 



Lameelidens generosus (Gould). 



Shell irregularly elliptical or somewhat obovate, rather thin, 

 convex or subcompressed, inequilateral ; narrowed and rounded 

 in front; posterior ridge rounded, ending in a rounded point 

 at or below the median line; dorsal outline slightly arched; 

 dorsal slope obliquely truncate, its outline straight or incurved, 

 meeting the dorsal line at an angle ; base line rounded, especially 

 full behind the middle; surface more or less concentrically 

 sculptured; epidermis dark chestnut or blackish, reddish in the 

 umbonal region, shining; teeth lamellar; laterals remote and 

 elevated; nacre bluish, sometimes salmon in the cavities. 



Length 91, height 58, diam. 27 mm. 



Burma; Pegu. 

 Unio generosus Gould, Pr. Bost. S. N. Hist., II, 1847, p. 220. 



— HanlEv and Theobald. Conch. Ind., 1876, p. 22. pi. xlvi, 



fig. 4. 

 Margaron (Unio) generosus Lea, Syn., 1870, p. 29. 

 LameUidens generosus Simpson, Syn., 1900, p. 857. 

 LameUidens marginalis var. generosus PrEston, Rec. Ind. 



Mus., VII, 1912, p. 304. 

 fUnio lameUatus Sowerby, Conch. Icon., XVI, 1868, pi. xciv, 



fig. 511- 

 Unio tinvaitesii HanlEy and Theobald, Conch. Ind., 1876, 



p. 20, pi. XLTII, fig. I. 



