1456 ANDDONTITES 



Anodontites falsus (Simpson). 



Shell much elono^ated, scarcely falcate, somewhat rhomboid, 

 scarcely subsolid, subcompressed, very inequilateral ; beaks low 

 and not inflated ; posterior ridge well developed, rounded, end- 

 ing in a blunt point at the base of the shell ; dorsal and basal 

 lines parallel ; anterior end rounded ; posterior end obliquely 

 rounded ; epidermis somewhat concentrically wrinkled, smooth- 

 er on the dorsal slope, with faint, radial markings in front, 

 dull ashy-brownish or greenish-brown, with inconspicuous rays 

 on the dorsal slope ; nacre bluish, dull purplish in the cavities, 

 iridescent. 



Length yj, height 21.5, diam. 11 mm. 



Yuruari River, a branch of the Orinoco. 

 Glabaris falsns Simpson, Syn., 1900, p. ()^2. 



This species stands between /?. ensiformis and A. solenifor- 

 mis, though I should think it considerably nearer to the for- 

 mer. It differs from that in having the dorsal and ventral 

 outlines parallel, in having the posterior end obliquely rounded 

 from above instead of being drawn out to a slender point, in 

 being duller colored exteriorly and internally. A. ensiformis 

 sometimes shows very feeble rays behind. 



The following are unfigured or unidentified species of Ano- 

 dontites : 

 Anodon porcifer Gray, Pr. Zool. Soc. Lond., 1834, p. 58. 



Paraguay. 

 Anodonta nicaragua Philippi, Zeits. fiir Mai., V, 1848, p. 130. 



— VON Martens, Biol. Cent. Am., Moll., 1900, p. 536. 



Nicaragua. 



Von Martens, (1. c), believes this to be the same as A. 

 bridgesii L<ea, in which case it would have priority. 

 Anodonta aperta Rafinesoue, Atl. Jl. No. 4, 1832, p. 134. 



Parana River, South America. 

 Anodonta atrovireits Philippi, Zeits. fiir Mai., V, 1848, p. 130. 



— VON Martens, Biol. Cent. .\m., Moll., iqoo, p. 534. — 



Simpson, Syn., 1900, p. 933. 



