1438 ANODONTITES 



line ; base straight or curved ; posterior end obliquely truncate 

 above, rounded below ; surface sculptured with fine, even 

 growth lines ; epidermis ashy-brownish or ashy-greenish, dark- 

 er on the posterior end and sometimes at the anterior end ; 

 nacre greenisli-bluish or flesh-colored, sometimes salmon in the 

 cavities. 



Length to8, height 62, diam. 45 mm. 



Lake Nicaragua. 

 Anodonta jezvettiana Lea, Pr. Ac. N. Sci. Phila., XII, 1868, 



P- 9.S- 

 Glnharis jeivittianus Simpson, Syn., 1900, p. 927. 

 Anodonta je-cvettii Lea, Jl. Ac. N. Sci. Phila., VI, 1869, p. 289, 



pi. xr.i, fig. lOT : Obs., XII, 1869, P- 49- p'- ^Li, fig. loi. — 



Clessin, Conch. Cab. Ano., 1874, p. 135, pi. xliv, figs, i, 2. 

 Margaron (Anodonta) jewettii Lea, Syn., 1870, p. 81. 



A very large series of shells of this species is before me, in- 

 cluding the ty]:ie. which is more strongly cut away at the an- 

 terior base than is the case in most specimens. As a rule the 

 shells are more inflated then those of G. bridgcsii, are 

 more regularly rhomboid, and are paler in color, but there are 

 intermediates, which approach both forms. The close, deli- 

 cate, concentric sculpture seen in the type is not absolutely 

 constant. Like the other species of the group the shell gapes 

 at the anterior base and is slightly open behind. I have seen 

 a few shells with faint, radial sculpture. 



Anotx)ntites FOifDESTANus (Lea). 



Shell trapezoid, somewhat inflated, sul)solid, slightly inequi- 

 lateral ; beaks rather full and high ; hinge line lightly arched ; 

 anterior end narrowed, rounded, angled above ; base nearly 

 straight or lightly curved ; posterior end almost squarely trun- 

 cated ; surface with feeble, concentric stri:ie : epidermis pale 

 brown, sometimes tinted wnth green and banded with burnt 

 brown, dark on the dorsal slope, shining ; nacre bluish-white ; 

 muscle scars somewhat impressed. 



Length 116, height 70, diam. 50 mm. 



I^ruguay ; Peru. 



