NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 877 



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



* Unio charruanus H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 493. — * Sowerby, 



Concli. Icon., XVI, 1868, pi. xciii, iigs. 505, 505a, 505&.— -^ PtETEL, Conch. 

 Sam., Ill, 1890, p. 147. 

 *Unio faha 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, Concli. Nom., 1845, p. 

 58._*H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 494. — *P^tei., Conch. 

 Sam., Ill, 1890, p. 152. 



* Margarita {Unio) fala Lea, Syn., 1838, p. 21. 

 ''Margaron ( Unio) f aba Lea, Syn., 1852, p. 31; 1870, p. 50. 



Uruguay. 



DIPLODON CAIPIRA von Ihering. 



"Unio caipira von Ihering, Arch. fiir. Nat., 1893, p. 98, pi. iv, fig. 9. — *Nehr]ng, 

 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) jyiceus Lea, Syn., 1870, p. 53. 



^ Unio suppositus voN Ihering (according to von Ihering), where is it described? 



Uruguay Eiver, South America. 



t ? DIPLODON WAGNERIANUM Simpson.' 



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

 and A. Adams, Gen. Eec. 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.ETEL, Conch. Sam., Ill, 1890, p. 151. 



""Margaron ( Unio) ellipticus Lea, Syn., 1852, p. 21; 1870, j). 31. 



Brazil. 



t DIPLODON .ffiiTHIOPS Lea. 



* Unio (Btliiops Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 91 ; *JI. 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 cethiops, Lea, var. piridoahana von Ihering, Arch, fiir Nat., 1893, p. 102. — 



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



Uruguay and Paraguay rivers; southern Brazil. 



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

 be Unio ligamentimis. Wagner placed this shell in the genus Unio in the test, but 

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

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

 wthiopiformis von Ihering. 



