ANODONTITES 1435 



pointed about on the median line ; surface with delicate, often 

 faint, concentric striae ; epidermis varying from ashy-green or 

 yellowish-green to brownish, sometimes feebly rayed and 

 banded ; nacre bluish to flesh-color, brilliant, often slightly 

 rayed. 



Length 103. height 60, diam. 37 mm. 



Length 90, height 60, diam. yj mm. 



Length 95, height 56.5, diam. 34 mm. 



Length T04, height 56, diam. 35 mm. 



Length 112, height 68, diam. 38 mm. 



Mexico ; South to Peru and Brazil. 

 Anodonta glaiica Valenciennes, Rec. Obs. Zool., H, 1833, p. 



236, pi. L, fig. 2. — Delessert, Rec. Coq. Lam., 1841, pi. xiii, 



fig. 2)- — Cr.ESSiN, Conch. Cab. Ano.. 1876, p. 222, pi. lxxiii, 



fig. I. — Fischer and Crosse, Miss. Sci., H, 1894, p. 533, pi. 



Lxix, figs. I, la. 

 Margarita (Anodonta) glauca Lea. Syn., 1836, p. 51 ; 1838, 



p. 30. 

 Anodon glauca Cateow and Reeve, Conch. Nom., 1845, P- 67. 

 Margaron f Anodonta) glauca Lea, Syn., 1852, p. 50; 1870, 



p. 80. 

 Monocondylcra glauca II. and A. AnAMS, Gen. Rec. Moll., H, 



1857. p. 501. 

 Glabaris glaucus Simpson, Syn., 1900, p. 926. 

 Anodonta hurfou ghiana Chenu (part). 111. Conch., 1858, pi. 



III. 



This is apparently a widely distributed and very variable 

 species. It varies from long elliptical to a rather short obovate 

 form and there is considerable difference in the degree of in- 

 flation and the color of the epidermis. I cannot separate spec- 

 imens before me, from Colombia. South America, from this 

 species, as they agree essentially with shells in the Stearns Col- 

 lection from JMazatlan, Mexico. Lea has a young shell in his 

 collection from Brazil, which he has labeled "Anodonta glau- 

 ca Valen.," which is probably the same. The species is gen- 

 erally of finer texture, is smoother externally and has a more 

 brilliant nacre than .]. trapesialis, to which it is closely allied. 



