NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 931 



tGLABARIS SCHROTERIANUS Lea. 



* Anodonta schroteriana LEA, Tr. Am. Phil. Soc.. XI, 1852, p. 292, pi. xxix, fig. 55; 



* Obs., V, 1852, p. 48, pi. xxix, fig. 55.* HUPE, Moll. Nouv., HI, 1857, p. 89, pi. 

 xvm, fig. 3. ^H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 503. *CLESSIN, 

 Conch. Cab. Ano., 1874, p. 151, pi. XLVII, figs. 5, 6. * P.ETEL, Conch. Sam., Ill, 

 1890, p. 184. 



* Margaron (Anodonta) ftchriiteriana LEA, Syn., 1852, p. 51 ; 1870, p. 82. 



* Anodon schroteriana SOWEUUY, Conch. Icon., XVII, 1868, pi. xx, fig. 74. 



* Margaritana schroteriana P^ETEL, Conch. Sam., Ill, 1890, p. 173. 



Amazon drainage. 



(Group of Glabaris obtusus.) 



Shell short, inflated, thin, feebly rayed, rays often broken ; base rather 

 full. 



tGLABARIS OBTUSUS Spix. 



* Anodon obtusits SPIX, Test. Flnv. Bras., 1827, p. 30, pi. xxn, fig. 3. 



* Margarita (Anodonta) obtusa LEA, Syn., 1836, p. 52; 1838, p. 31. 



* Anodonta obiusa HANLEY, Test. Moll., 1842, p. 221; Biv. Shells, 1843, p. 221. 



*POTIEZ and MICHAUD, Gall. Moll., 1844, p. 144, pi. LV, fig. 3. *KUSTER, 

 Conch. Cab. Ano., 1853, p. 8, pi. n, figs. 3, 4. *H. and A. ADAMS, Gen. Rec. 

 Moll., II, 1857, p. 504. *MUSGRAVE, Phot. Conch., 1863, pi. i, fig. 7. * CLES- 

 SIN, Conch. Cab. Ano., 1875, p. 170, pi. LVI, figs. 1, 2. * P.ETEL, Conch. Sam., 

 Ill, 1890, p. 182. 



* Margaron (Anodonta) obtusa LEA, Syu., 1852, p. 51; 1870, p. 82. 



* Anodon obtusa CATLOW and REEVE, Conch. Norn., 1845, p. 67. *SO\VERBY, 



Conch. Icon., XVII, 1867, pi. XH, fig. 39. 



* Anodonta VALENCIENNES, Coq. Mar. Biv., 1827?, pi. XLVIII. figs. 3a, 36. l 



Brazil; Paraguay. 



fGLABARIS LITURATUS Spix. 



* Anodon obtnsus var. b. lituraium SPIX, Test. Flnv. Bras., 1827, p. 30, pi. xxn, fig. 4. 

 .luodonta Utturata HUPE, Moll. Nouv., 1857, p. 87, pi. xvn, fig. 4.- 



* Anodon liturata SOWERBY, Conch. Icon., XVII, 1868, pi. xx, fig. 78. 



Brazil. 



Section VIEGULA Simpson, 1900. 

 (Type, (ilaburia enaiformis Spix.) 



Shell subsolid to solid, moderately inflated, greatly elongated, straight 

 or falcate, rounded in front, sharply pointed at the posterior base, 

 where the high, sharply defined posterior ridge ends and above which 

 it is somewhat obliquely truncated; beaks not high; epidermis green 

 to olive; nacre brilliant, bluish or purplish, iridescent, rayed with very 

 tine, indistinct ridges; posterior end with a slight sinus. 



Animal unknown. 



'Valenciennes gives no name or description with the above, but the figure is, no 

 doubt, G. obtusa. 



2 Hupe is certain that this is different from obtusus, and says that the small angular 

 marks on its surface are very distinct; that it is thinner and less inflated. I doubt 

 whether it is more than a variety of obtusus. 



