NO. 1205. SYNOPSIS OF THE NAIADES SIMPSOX. 877 



* Margaron (Unio) charruanus LEA, Syn., 1852, p. 29; 1870, p. 54. 



* Unio charrtianus H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 493. * SOWERBY, 



Conch. Icon., XVI, 1868, pi. xcm, figs. 505, 505a, 5056." P.ETEL, Conch. 

 Sam., Ill, 1890, p. 147. 



*Unio fdba D'ORBiGNY, Mag. Zool., 1835, p. 35. *HANLEY, Test. Moll., 1842, p. 

 197. *D'ORBIGNY, Voy. Am. Mer., 1843, p. 606, pi. LXXI, figs. 8-11. * HAN- 

 LEY, Biv. Shell, 1843, p. 197. *CATLOW and REEVE, Conch. Nom., 1845, p. 

 58. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. *P,ETEL, Conch. 

 Sam., Ill, 1890, p. 152. 



* Margarita (Unio) fata LEA, Syn., 1838, p. 21. 

 ^Margaron ( Unio) fala LEA, Syn., 1852, p. 31; 1870, p. 50. 



Uruguay. 



DIPLODON CAIPIRA von Ihering. 



* Unio caipira vox IHKRING, Arch. fur. Nat., 1893, p. 98, pi. iv, fig. 9. *NEHRING, 



Jl. de Conch., 1894, p. 83. 



Southern Brazil. 



t DIPLODON PICEUS Lea. 



* Unio piceus LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 91 ; * Jl. Ac. N. Sci. Phila., V, 



1863, p. 397, pi. XLI, fig. 287; * Obs., X, 1863, p. 15, pi. XLI, fig. 287. 



* Margaron ( Unio) piceus LEA, Syn., 1870, p. 53. 



* Unio suppositus VON IHERING (according to von Ihering), where is it described? 



Uruguay River, South America. 



t ? DIPLODON WAGNERIANUM Simpson.t 



*Unio ellipticus WAGNER, Test. Fluv. Bras., 1827, p. 33, pi. xxvi, figs. 1, 2. "H. 

 and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 497. * KUSTER, Conch. Icon. Unio, 

 1861, p. 238, pi. LXXX, fig. 2.* SOWERBY, Conch. Icon., XVI, 1868, pi. LXXIV, 

 fig. 382. * P^TEL, Conch. Sam., Ill, 1890, p. 151. 



* Margaron ( Unio) ellipticua LEA, Syn., 1852, p. 21; 1870, p. 31. 



Brazil. 



t DIPLODON /ETHIOPS Lea. 



* Unio cetUops LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 91 ; *J1. Ac. N. Sci. Phila., V, 



1863, p. 377, pi. XLI. fig. 285; Obs., X, 1863, p. 13, pi. XLI, fig. 285. * VON 

 MARTENS, Mai. Bl., XVI, 1868, p. 196. 



* Margaron ( Unio) cethiops LEA, Syn., 1870, p. 53. 



DIPLODON ^THIOPS var. PIRICICABANA von Ihering. 



* Unio (Pthiops, LEA, var. piriticabana VON IHERING, Arch, fur Nat., 1893, p. 102. 



* NEHRING, Jl. de Conch., 1894, p. 83. 



Uruguay and Paraguay rivers; southern Brazil. 



1 Barnes applied the name Unio ellipticus in 1823 to a species which is believed to 

 be Unio ligamentinus. Wagner placed this shell in the genus Unio in the text, but 

 Spix called it Diplodon ellipticum in the plate. I therefore change the name to 

 wagnerianum. I have never seen a shell that just agrees with his figure. It is near 

 cethiopiformis von Ihering. 



