ANODONTITES I419 



Anodonta strcbelii Lea, Pr. Ac. N. Sci. Phila.. XX, 1868, p. 



150; Jl. Ac. N. Sci. Phila.. VII, 1868. p. 322, pi. ui, fig. 135 ; 



O'bs., XII, 1869, p. 82, pi. iji, fig. i35._Ci.ESSiN, Conch. 



Cab. Ano., 1874, p. 138, pi. xiji, figs. 5. 6. 

 Margaron (Anodonta) strebelu Lua, Syn., 1870, p. 79. 

 Glaharis strehelii Simpson, Syn., 1900, p. 920. 



This species was founded on a single, evidently young spec- 

 imen, whose soft parts Dr. Lea examined. Both shell and 

 anatomy go to show that it is an Anodontitcs and not an Ano- 

 donta. The shell is shining and appears rather dark, probably 

 on account of the dark nacre. 



Anodontitus cylindracrus (Lea). 



Shell long obovate or rhomboid, scarcely subsolid, convex, 

 inequilateral ; dorsal outline lightly curved, base nearly straight ; 

 anterior end narrowed and rounded; posterior end obliquely 

 subtruncate above, rounded below ; beaks rather low ; surface 

 with irregular growth lines ; epidermis with faint, loop-like 

 wrinkles arranged in radiating rows, scarcely wrinkled behind 

 the middle of the shell, tawny green with delicate, faint, darker 

 rays, somewhat shining; nacre bluish, violet-tinted and richly 

 iridescent. 



Length 40, height 20, diam. 12 mm. 



Length 57, height ^2, diam. 19 mm. 



Medellin River, Mexico. 

 Margarita (Anodonta) cylindracea Lea, Syn., 1836, p. 54; 



1838, p. 32. 

 Anodonta cylindracea Lea, Tr. Am. Phil. Soc, VI, 1838, p. 



45, pi. XIII, fig. 40; Obs., II, 1838, p. 45, pi. XIII, fig. 40.— 



ClEvSSin, Conch. Cab. Ano., 1874, p. 161, pi. uii, figs. 5, 6. 



— Fischer and Crosse, Miss. Sci., II, 1894, p. 528. — von 



Martens, Biol. Cent. Amer., Moll., 1900, p. 535. 

 Anodon cylindracea Sowerp.y, Conch. Icon., XVII, 1869, pi. 



XXIV, fig. 93. 

 Margaron (Anodonta) cylindracea Lea, Syn., 1852, p. 51; 



1870, p. 82. 

 Glaharis cylindraceus Simpson, Syn., 1900, p. 920. 



