NO. 1205. SYNOPSIS or Tin: \Ai.un-:ssiMrsf>.\. 883 



t DIPLODON CUPRINUS Simpson. 

 I'nio f raff His SOWKUBY,' Couch. Icon., XVI, 1856, pi. xxx, fig. ir>r>. 



Island of Chiloe, Chile. 



DIPLODON AUREUS Simpson. 



* Unto auratus KUSTER, Conch. Cab. Unio,1856, p. 161, pi. XLVI, fig. 3. 2 



Chile. 



DIPLODON CORIACEUS Dunker. 



*Unio coriaceiia DUXKKK, Zeits. fiir. Mai., V, 1848, p. 181. * VON IHEKING, Arch, 

 fur Nat., 1893, p. 115. 



Rio Negro, Province of Rio Janeiro, Brazil. 



DIPLODON CHILDRENI Gray. 



* Unio childreni GRAY, Griff. Cuv., XII, 1834, p. 600 (index), pi. xx, fig. 1. * CAT- 



LOAV and REEVE, Conch. Icon., 1845, p. 57. * H. and A. ADAMS, Gen. Rec. 



Moll., II, 1857, p. 493.* P.KTKL, Conch. Sam., Ill, 1890, p. 148. 

 Margarita (Unio) childreni LEA, Syu., 1836, p. 25; 1838, p. 19. 

 *Mar<jaron (Unio) childreni LEA, Syu., 1852, p. 28; 1870, p. 44. 



South America. 



(Group of Diplodon burroughianus.) 



Shell elliptical, moderately solid, inflated, sharply pointed behind, 

 with a high, w ell- developed posterior ridge; beaks rather full; the 

 sculpture consisting of regularly radiating, widely separated, sharp 

 ridges, the intervening grooves rounded out; < piderinis smooth, dark 

 olive with lighter bands; pseudocardinals compressed, rough, vertically 

 ridged, usually trifid or quadrifid in each valve ; laterals curved, com 

 pressed, muscle scars smooth; nacre white, silvery. 



Animal unknown. 



f DIPLODON BURROUGHIANUS Lea. 



* Unio burroughianus, LEA, Tr. Am. Phil. Soc., V, 1834, p. 67, pi. x, fig. 27; * Obs., 



1, 1834, p. 179, pi. x, fig. 27.* D'ORBIGXY, Guer. Mag., 1835, p. 34.* HANLEY, 

 Test. Moll., 1842, p. 197 ; * Biv. Shells, 1843, p.197, pi. xxn, fig. 2.* D'ORBIGXY, 

 Voy. Am. Mer., 1843, p. 609.* CATLOW and REEVE, Conch. Nom., 1845, p. 56. 

 * H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 493. * SOWERBY, Conch. Icon., 

 XVI, 1866, pi. xxxn, fig. 169.* P.ETEL, Conch. Sam., Ill, 1890, p. 146. 



* Margarita ( Unio) burroughianus, LEA, Syn., 1836, p. 29 ; 1838, p. 21. 



* Margaron ( Unio) burroughianus, LEA, Syn., 1852, p. 31 ; 1870, p. 50. 



Parana River, South America. 



1 Sowerby's name being preoccupied in Unio, I change it to cuprinus, which has 

 not been used in Diplodon. The date, 1856 on the, plato. is perhaps a typographical 

 error for 1866. 



-The name auratus is preoccupied in Unio, by Philippi in the Conchylien. This 

 being a different species, I change it to aureus. 



