ANOnONTlTES 142^ 



Anodon holtonis Sowerby, Conch. Icon., XMI, 1870, pi. 



XXXVI, fig. 147. 

 Margaron (Anodontn) hoUovis Lha, Syn., 1870, p. 79. 

 Glabaris holtonis vSimpson, Syn., 1900, p. 921. 



A thin, obloiig, somewhat rhomboid, subinflated species 

 with a dirty green epidermis. The beaks are higher than are 

 those of cytindracens and the shell is thinner and only rayed 

 behind. 



Group of Anodontites iiucqitiz'oh'is. 



Shell elliptical, moderately solid and inflated, with a low 

 posterior ridge, slightly produced behind near the base and 

 truncated above the posterior slope; beaks full, smooth; lig- 

 ament imbedded in a sort of groove, which extends to the an- 

 terior point of the shell ; epidermis slightly roughened, often 

 cloth-like, and showing the rest periods, having faint, radiating 

 lines : nacre bluish, soft, but not brilliant. 



Animal unknown. 



Anodontites in.'Dquivalvis (Lea). 



Shell small, slightly inecjuivalve, inequilateral, subelliptical 

 or subrhomboid, convex, scarcely subsolid ; anterior end round- 

 ed, sometimes slightly cut away below ; dorsal and basal re- 

 gions rounded ; posterior end obliquely subtruncate above ; 

 surface with irregular growth lines ; epidermis having concen- 

 tric, delicate folds, which are more or less looped, the loops 

 arranged in radial rows, greenish, tawny or straw-color, 

 sometimes faintly rayed ; nacre bluish, greenish^blue or flesh- 

 color, bright and iridescent. 



Length 42, height 28, diam. 17 mm. 



Length 35, height 24, diam. 15 mm. 



Lake Nicaragua ; Mexico. 

 Anodonta inccquivalvis Lea, Pr. Ac. N. Sci. Phila., XH, 1868, 



p. 95 : Jl. Ac. N. Sci. Phila.. VL 1868, p. 292, pi. xeiii, fig. 



T08; Obs.. Xn, 1869, p. 52. pi. xLiTT, fig. 108. — Clessin, 



Conch. Cab. Ano., 1874, p. 137, pi. xijv, figs. 7, 8. 

 Mavi^aron (Anodonta) incrquk'ah'is Lea, Syn.. 1870. p. 83. 

 Glabaris inccquivakns Simtsox, Syn., 1900, p. 922. 



