NO. 1205. SYNOPSIS OF THE NAIADES SIMPSOX. 875 



tDIPLODON URUGUAYENSIS Lea. 



*Unio urufjuayensis LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 90; *J1. Ac. N. Sci. 

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

 *SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXIV, fig. 448. * PJETEL, Conch. 

 Sam., Ill, 1890, p. 171. 



*Haryaron ( Unio) uruyiiai/ensis 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, fig. 23; Ml. Ac. N. Sci. Phila., 1858, p. 308, pi. xxix, fig. 23. 

 *SOWERBY, Conch. Icon., XVI, 1868, pi. XL, tig. 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. xr.in, fig. 146; Obs., VII, 1860, p. 84, pi. XLIII, fig. 

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



* Margaron ( Unio) rudus LEA, Syn., 1870, p. 50. 



* Unio rudis P.ETEL, Conch. Sam., Ill, 1890, p. 166. 



Rio de la Plata. 



tDIPLODON GREEFIANUS von Ihering. 



* Unio greefianm vox IHERING, Arch, fiir Nat., 1893, p. 96, pi. iv, fig. 18.' *NEII- 



RING, .11. de Conch., 1894, p. 82. 



Sao Paulo, Brazil. 



tDIPLODON PIGER Lea. 



*Unio pigei- LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 90; Ml.. Ac. N. Sci. Phila.,V, 

 1863, p. 388; *Obs., X, p. 23, pi. XLV, fig. 396. * SOWERBY, Condi. Iron., XVI, 

 1868, pi. LXXXIV, fig. 449. M?.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 beskeanus DUNKKIJ, Zeits. fur Mai., V, 1848, p. 182. 2 



* Margaron ( Unio) beskeanus LEA, Syu., 1870, p. 61. 



Brazil. 



'Credited to Dunker Manuscript. 



2 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 been 

 figured. 



