880 PROCEEDINGS OF THE XATK>\.il. MUSEUM. VOL.XXII. 



tDIPLODON RUFOFUSCUS Lea. 



* Unio rufojuscus LEA, Pr. Ac. N. Sci. Phila., IX, 1865, p. 76; *J1. Ac. N. Sci. Phila., 



VI, 1868, p. 282, pi. xxxix, fig. 96; *Obs., XII, 1869, p. 42, pi. xxxix, fig. 96. 

 *Marayon ( Unio) rufofuacus LEA, Syn., 1870, p. 31. 



South America. 



DIPLODON DEMARARAENSIS Lea. 



* I'nio demararaensis LEA, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 152; *J1. Ac. N. Sci. 



Phila., IV, 1860, p. 253, pi. xxxix, fig. 133; *Obs., VII, 1860, p. 71, pi. xxxix, 

 fig. 133. *REEVE, Conch. Icon., XVI, 1865, pi. xxn, fig. 99. 



* Maragron ( Unio) demararaensis LEA, Syn., 1870, p. 36. 

 t'lrio demararaensis P^TEL, Conch. Sam., Ill, 1890, p. 150. 



Demerara. 



tDIPLODON LEPIDIOR Lea. 



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



V, 1863, p. 390J pi. L, fig. 306; "Obs., X, 1863, p. 25, pi. L, fig. 306. 



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



Uruguay River. 



tDIPLODON PARCUS Lea. 



* Unio parcus LEA, Pr. Ac. N. Sci. Phila., X, 1866, p. 34 ; *J1. Ac. N. Sci. Phila., VI, 



1868, p. 262, pi. xxxin, fig. 77 ; * Obs., XII, 1869, p. 22, pi. xxxni, fig. 77. 

 ' Margaron ( Unio) parcus LEA, Syn., 1870, p. 47. 



South America. 



tDIPLODON CHILENSIS Gray. 



* Unio chilensis GRAY, Spic. Zool., 1828, pi. vi, fig. 12.* PHILIPPI, Conch., Ill, 1847, 



p. 9, pi. iv, fig. 2.* HUPE, Gay's Hist. Chile, VIII, 1854, p. 317.* H. and A. 

 ADAMS, Gen. Rec. Moll., II, 1857, p. 497.* KUSTER, Conch. Cab. Unio, 1862, 

 p. 282,pl. xcv, fig. 12.* SOWERBY, Couch. Icon., XVI, 1867, pi. LVI, fig. 286. 



* P^ETEL, Conch. Sam., Ill, 1890, p. 148. 



* Unio smUhii GRAY and PIDGKON, Griff. Cuv., XII, 1834, p. 600, pi. xx, fig. 3. 2 



* HANLEY, Biv. Shells, 1843, p. 195, pi. xxm, fig. 58. * H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p. 495.* P^ETEL, Conch. Sam., Ill, 1890, p. 167. 



* Margarita ( Unio) smithii LEA, Syn., 1836, p. 27; 1838, p. 20. 



* Margaron ( Unio) smUhii LEA, Syn., 1852, p. 30; 1870, p. 48. 



* Unio auratus PHILIPPI, Conch., Ill, 1847, p. 9, pi. iv, fig. I. 3 * H. and A. ADAMS, 



Gen. Rec. Moll., II, 1857, p. 492. * P/ETEL, Conch. Sam., Ill, 1890, p. 145. 

 * Margarita ( Unio) auratus LEA, Syn., 1836, p. 31; 1838, p. 22. 

 * Margaron ( Unio) atiratus LEA, Syn., 1852, p. 33; 1870, p. 53. 



* Unio araucanus PHILIPPI, Conch., Ill, 1847, p. 50, pi. iv, fig. 3.' KUSTER, Conch. 



Cab. Unio, 1862, p. 283, pi. xcv, fig. 3. 



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



* Unio araucana HUPE, Gay's Hist. Chile, 1854, p. 317. 



Chile. 



1 Changed to lepidior because the name lepidus had been used for a Unio by Gould. 



2 Only the briefest description is given of this in the index. From the figure it 

 seems to be identical with chilensis. 



3 Generally credited to Swainson, and Philippi refers it to him with doubt. But I 

 can not find that Swaiuson ever published it. 



