1300 niPLODON 



cardinals double in each valve ; laterals remote ; nacre bluish 

 or flesh-colored, thicker in front. 



Length 75. height 42, diam. 22 mm. 



Hunter's River, New South Wales. 

 Unio profugus Gould, Pr. Bost. Soc. N. H., 1850, p. 295; 



U. S. Expl. Exp., XII, 1852, p. 429, figs. 543, 543a, 543/7. 

 Margaron (Unio) profugus Li-;.\, Syn., 1852, p. 29. 

 Diplodon profugus Simpson, Syn., 1900, p. 891. 



A single right \'alve lalieled "Type" from Hunter's River, 

 New South Wales, is in the National Museum collection, be- 

 sides a smaller shell from Paramatta, which is shorter in pro- 

 portion. I am somewhat doubtful as to the validity of this 

 species. The type is more elongated, more compressed, and 

 rather lighter colored than any specimens of anstraUs I have 

 seen, but the outline of the smaller shell is intermediate be- 

 tween the two. 



Dii'LODON MORKTONicus (Recve). 



Shell subrhomboid, oblong, somewhat inequilateral ; beaks 

 moderately full : posterior ridge well developed, roiuided, end- 

 ing in a broadly rounded point at the base of the shell ; dorsal 

 line lightly curved : anterior end rounded ; base line straight ; 

 dorsal end obliquely striate : epidermis fuscous-black. 



Length of figure 71, lieight 42.5 mm. 



Tasmania. 

 Unio morctoniciis Riiivvr;, Conch. Icon., X\ I, 1865, pl- xxiv, 



fig. IT 8. 

 Diplodon nwrctonicus Simpson, Syn., 1900, p. 891. 

 Margaron (Unio) mortonicus Lea, Syn., 1870, p. 43. 



While Reeve's figure is a good one, his description of this 

 species is utterly inadequate. It is quite probable that he had 

 before him a Unio ohesus hlandingianus from Florida, as his 

 figure and brief, incomplete description absolutely agree with 

 that. 



DiPi.onoN cui.TEi.i.iroRMTS (Conrad). 



Shell somewhat elongate, subelliptical, subobovate or slight- 

 ly rhomboid, inequilateral, scarcely subsolid, compressed ; beaks 



