DIPr.ODON 1299 



Unio legrandi Petterd, Pr. R. Soc. Tasm., 1887, P- 22; 1888, 

 p. 81. 



Diplodon aiistralis var. legrandi Simpson, Syn., 1900, p. 891. 



DiPi.ODON jisFFKEYSiANUs (Lea). 



Shell subrhomboid, convex, subsolid or rather thin, some- 

 what inequilateral; beaks slightly elevated, scarcely inflated; 

 anterior end rounded ; base and dorsal lines lig-htly curved ; 

 posterior end obliquely subtruncate ; posterior ridge low, 

 rounded ; above it there are one or two low. rather wide, radial 

 ridges; surface with close, fine, concentric sculpture; epidermis 

 pale ashy brownish to brownish-olive, subshining; teeth deli- 

 cate, compressed ; pseudocardinals double in the left valve, 

 single in the right ; laterals single in each valve, remote ; mus- 

 cle scars shallow ; nacre bluish-white or flesh-colored. 



Length j;^, height 45. diam. 2;^ mm. 



Australia. 

 Unio jeffreysianus Lea, Pr. Ac. N. Sci. Phila., L 1871. p. 188; 



Jl. Ac.N. Sci. Phila., VIII, 1874, p. 2^, pi. vii, fig. 20; Obs., 



Xin, 1874. p. 2y, pi. viT, fig. 20. 

 Diplodon jeffreysianus Simpson, Syn., iqoo, p. 891. 



The type consists of two matched valves and I am a little 

 dubious as to whether the species is a valid one. One valve, 

 the right, is darker, more strongly sulcate, and duller colored 

 than the left. This matched pair is considerably more com- 

 pressed than any specimens I have seen of aiistralis, and it 

 has the super-posterior ridges, which I have not seen in that 

 shell. 



Diplodon profugus (Gould). 



Shell oblong, narrowed a little in front, subrhomboid, sub- 

 compressed or convex, subsolid; beaks somewhat nearer the 

 anterior end, rather full; posterior ridge low. rounded; ante- 

 rior end rounded ; dorsal and basal outlines lightly curved or 

 nearly straight; surface with irregular, strong, concentric 

 sculpture; epidermis dirty greenish; teeth delicate; pseudo- 



