830 PROCEEDINGS OF THE NATIONAL MUSEUM. 



The following are unfigured species of Grandidieria : 



G. rotundata Bourguignat, Not. Prod., 1885, p. 98. 

 G. mira Bourguignat, Not. Prod., 1885, p. 96. 

 G. locardiana BonTgnignsit, Esp. Ouk., 1885, p. 18. 

 G. incarnata Bourguignat, Moll. Gir., 188.5, p. 101. 

 G. glraudi Bourguiguat, Not. Prod., 1885, p. 95. 

 G. elomjata Bourguiguat, Moll. Gir., 1885, p. 14. 



Genus PHYSUNIO, Simpson, 1900. 

 (Type, Unio gravidns Lea.) 



Shell thin, irregularly obovate, narrowed in front, decidedly produced 

 at post base, pointed behind and posteriorly winged, with a moderate 

 posterior ridge and often a second or third faint ridge above it; beak 

 sculpture zigzag radial, somewhat disposed in two sets, the one down 

 the posterior ridge slightly nodulous ; posterior slope having irregular 

 radial corrugations, the rest of the shell smooth; epidermis often cloth- 

 like, with one or more green rays on the posterior slope; hinge line 

 curved; a single obliquely granularly striate pseudocardinal and gen- 

 erally three laterals in the left valve, and two pseudocardinals and two 

 laterals in the right, all greatly compressed; beak cavities deep; mus- 

 cle scars irregular ; nacre bright, bluish, and iridescent. 



Animal unknown. 



Section PHYSUNIO Simpson, 1900. 

 (Type, Unio gravidus Lea.) 



Shell inflated; beak cavities deep and rounded. 



fPHYSUNIO GRAVIDUS Lea. 



*- Unio gravidml^^A, Pr. Ac. N. Sci. Phila.,VIII, 1856, p. 93; Obs., VI, 1857, p. 12, pi. 

 XXIV, fig. 5; Jl. Ac. N. Sci. Phila., Ill, 1858, p. 292, pi. xxiv, fig. 5.— 

 * VON Martens, Pr. Zool. Soc. Lond., 1860, p. 14. — * Sowerby, Conch. Icon., 

 XVI, 1866, pi. Lii, fig. 271.— *MoRELET, Ser. Conch., IV, 1875, p. 347.— 

 *P^.TEL, Conch. Sam., Ill, 1890, p. 154. 



'^ Mar gar on {Unio) gravidus Lea, Syn., 1870, p. 28. 



""Lampsilis gravidus Eochebrune, Bull. Soc. Phil., VI, 1882, p. 43. 



* Unio ahnormis Mo relet. Rev. et Mag., XIV, 1862, p. 480. 



""Unio superlus Sowerby, Conch. Icon., XVI, 1867, p. LIX, fig. 295. 



Siam; Cambodia; Cochin China. 



tPHYSUNIO SUPERBUS Lea. 



"Unio superhus'LEA, Desc. 12 New Uniones, 1843 (no pagination); Tr. Am. Phil. 



Soc, IX, 1845, p. 281, pi. XLii, fig. 11; Obs., IV, 1848, p. 39, pi. XLii, fig. 11.— 



H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 498.— *V0N Martens, Mai. 



BL, XIV, 1866, p. 14.— *P^TEL, Conch. Sam., Ill, 1890, p. 169. 

 *Margaron (Unio) superbus Lea, Syn., 1852, p. 19; 1870, p. 28. 

 *Unio velaris Hanley, Biv. Shells, 1856, p. 385, pi. xxiii, fig. 42.' 

 *Unio massini Morelet, Jl. de Conch., XII, 1864, p. 288; Ser. Conch., IV, 1875, 



p. 348, pi. XV, figs. 1, 3.— 'PiETEL, Conch. Sam., Ill, 1890, p. 158. 



Sumatra; Cochin China. 



1 Credited to Benson manuscript. 



