NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 875 



tDIPLODON URUGUAYENSIS Lea. 



*Unio uruguayensis Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 90; *J1. Ac. N. Sci. 

 Phila., V, 1863. p. 388, pi. xlv, tig. 298 ; *Obs., X, 1863, p. 241, pi. xlv, iig. 298.— 

 *SowERBY, Conch. Icon., XVI, 1868, pi. lxxxiv, iig. 448. — ''P.etel, Conch. 

 Sam., Ill, 1890, p. 171. 



*Margaron ( Unio) uruguayensis Lea, Syn., 1870, p. 46. 



Uruguay River, South America. 



tDIPLODON WHEATLEYANUS Lea. 



* Unio wheatleyanus Lea, Pr. Ac. N. Sci. Phila., VIII, 1856, p. 94 ; * Obs., VI, 1857,p. 



28, pi. XXIX, iig. 23; Ml. Ac. N. Sci. Phila., 1858, p. 308, pi. xxix, fig. 23.— 

 *SowERBY, Couch. Icon., XVI, 1868, pi. xl, iig. 487. — *Strobel, Mat. Mai., 

 Pt. 1, 1874, p. 71. 

 * Margaron ( Unio) wheatleyanus Lea, Syn., 1870, p. 50. 



Argentina. 



tDIPLODON RUDUS Lea. 



*Unio rudus Lea, Pr. Ac. Nat. Sci. Phila., Ill, 1859, p. 187; *J1. Ac. Nat. Sci. 



Phila.,IV, 1880, p.266, pi. xliii, fig. 146; Obs., VII, 1860, p. 84, pi. xoii, fig. 



146.— *KUSTER. Conch. Cab. Unio, 1861, p. 261, pi. Lxxxviii, fig. 1. 

 ^Margaron ( Unio) rndas Lea, Syn., 1870, p. 50. 



* Unio riidis PzETEL, Conch. Sam., Ill, 1890, p. 166. 



Rio de la Plata. 



tDIPLODON GREEFIANUS von Ihering. 



"Unio greefianus VON Ihering, Arch, fiir Nat., 1893, p. 96, pl.iv, fig. 18.' — *Neii- 

 RiNG, Jl. de Conch., 1894, p. 82, 



Sao Paulo, Brazil. 



tDIPLODON PIGER Lea. 



''Unio piger Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 90; *J1. Ac. N. Sci. Phila., V, 

 1863, p. 388; *Obs., X, p. 23, pi. xlv, tig. 296.— *Sowerby, Conch. Icon., XVI, 

 1868, pi. LXXXIV, fig. 449.— *P.ETEL, Conch. Sam., Ill, 1890, p. 163. 



* Margaron ( Unio) piger Lea, Syn., 1870, p. 46. 



Uruguay River, South America. 



tDIPLODON PRUNOIDES Lea. 



""Unio prunoides Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 150; *J1. Ac. N. Sci. 

 Phila., VI, 1868, p. 323, pi. Liii, fig. 136 ; * Obs., XII, 1869, p. 83, pi. liii, fig. 136. 



* Margaron ( Unio) prunoides Lea, Syn., 1870, p. 47. 



South America.'? 



tDIPLODON BESKEANUS Dunker. 



* Unio beskeaniis Dunker, Zeits. fiir Mai., V, 1848, p. 182.^ 



* Margaron ( Unio) beskeanus Lea, Syn., 1870, p. 61. 



Brazil. 



' Credited to Dunker Manuscript. 



^ There is a specimen in the Lea collection contributed under this name by Dunker 

 himself. It is near locellus and suavidicus. I do not know that it has ever hew 

 figured. 



