1440 ANODONTITES 



? Anodon c.roticiis Sowkrry, Conch. Icon., XVII, 1867, pl- 



xvr, fig. 57. 

 Anodonta angustata Ci-KSSin, Conch. Cab. Ano., 1876, p. 226, 



pi. i.xxiv, fig's. 6, 7. 

 Anodonta hertungiivo^ Ihering, Arch, fiir Nat., 1890, p. 150, 



pi. IX, fig. 7. 

 Glaban's hert<vigii Simpson, Syn., iqoo, p. 925. 



A fine series of this species is now before me and a careful 

 study of it convinces me that- von Ihering's Anodonta hert- 

 zvigii is the same. He gives a very rough outline figure of his 

 species, in which the ventral region is incurved medially, and 

 refers to the figure and description of A. anserina in the New 

 Conchylien Cabinet. In the figure in that work the base of the 

 shell is considerably produced medially, but I am now convinced 

 that it is the same as Lea's moricandii. A dorsal view of this 

 shell shows the sides to be flattened and nearly parallel. 



Group of Anodontites georgina. 



Shell subsolid, obovate, with a decided, curved posterior 

 ridge, and a smaller one above it, the space between the ridges 

 a shallow groove. 



Anodontites georgin.t^ (Gray). 



Shell irregularly obovate, solid, inequilateral ; beaks not 

 miuch elevated or inflated ; posterior ridge high, sharply an- 

 gled, ending in a point about on the median line; above it 

 there seems to be a low, radial ridge ; dorsal outline arched ; 

 anterior end narrowed, rounded ; base subangularly produced 

 behind the middle; epidermis thick, olive-colored; nacre varie- 

 gated purple and red. 



Length (of figure) 62.5, height T^y mm. 



Rivers of Paraguay. 

 Anodonta georgince Gray, Grifi:'. Cuvier., XII, 1834, pi. xix. 

 Glaharis georgince Simpson, Syn., 1900, p. 927. 



A species, which seems to diflfer very decidedly from all 

 others by having a sharp, high posterior ridge. No measure- 

 ments, and only the briefest description are given, this con- 

 sisting of a few words in the index. 



