1268 DIPLOnON 



pseudocardinals, the upper small, and one lateral ; nacre bluish- 

 white. 



Length 55, height 29, diam. 15 mm. 



South America. 

 Unio bimieyi Lea, Pr. Am. Phil. Soc, IV, 1845, p. 165 ; Tr. 



Am. Phii Soc, X, 1848, p. 72, pi. vi, fig. 18; Obs., IV, 1848, 



p. 51, pi. VI, fig. 18. 

 Margaron (Unio) binneyi Lea, Syn., 1852, p. 29; 1870, p. 46. 

 Diplodon binneyi Simpson, Syn., 1900, p. 878. 



Dr. I.ea received this shell from Dr. Griffith and it is labeled 

 "Alabama" with a question, though he credits it to^ the South- 

 ern States in his description. The type, the only shell I have 

 seen, though eroded at the beaks shows radial sculpture plain- 

 ly, some of this extending on to the healthy epidermis. It is 

 thinner than dunkerianu-s, is much more strongly sulcate, is 

 lighter colored and not so shining, and has shorter pseudocar- 

 dinals. It probably groups with it. 



Diplodon aureus Simpson. 



Shell oblong, irregularly elliptical, subsolid, convex, inequi- 

 lateral ; dorsal outline more strongly curved than that of the 

 base ; beaks moderately full, their sculpture radial ; posterior 

 ridge low and rounded, ending behind in a bluntly rounded 

 point a little above the base ; surface strongly, concentrically 

 sculptured ; bronzy, olivaceous-yellow, shining; pseudocardinals 

 small, crenated ; those of the left valve united ; there are two 

 compressed ones in the right valve, the upper smaller ; left 

 valve with two remote laterals ; right valve with one ; muscle 

 scars impressed ; nacre bluish-white, stained dull purple in the 

 cavities. 



Length 60, height 30, diam. 20 mm. 



Length 68, height 34. diam. 22 mm. 



Chile. 

 Unio onvatiis Ku?Ti:r, Conch. Cab. I'nio, 1856, p. 161, pi. 



XLVI, fig. 3. 

 Diplodon aureus Simpson, Syn., i(po, p. 883. 



A fine species, of which the Lea Collection contains a good 

 specimen. The radial sculjiture occupies Init a small area, the 



