NO. 1205. SYNOPSIS OF TSi: NAIADES— SIMPSON. 931 



tGLABARIS SCHROTERIANUS Lea. 



'^ Aiiodotita 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., Ill, 1857, p. 89, pi. 

 XVIII, fig. 3.— ^H.nml A. Adaws, Gen. Rec. Moll., II, 1857, p. 503.— ^Clessin, 

 Concli. Cab. Auo., 1874, p. 151, pi. xlvix, figs. 5, 6. — "P.etel, Conch. Sam., Ill, 

 1890, p. 184. 



* Margaron {Avodonta) ftchroteriana Lea, Syn., 1852, p. 51; 1870, p. 82. 



*■ Anodon schroteriana Sowerby, Couch. Icon., XVII, 1868, pi. xx, fig. 74. 

 '' Margaritana schroieriana P.etel, Couch. 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 oltusus Spix, Test. Fluv. Bras., 1827, p. 30, pi. xxii, fig. 3. 



* Margarita (Anodonta) ohtiisa Lea, Syn., 1836, p. 5i; 1838, p. 31. 



*Anodonta ohtusa 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. ii, figs. 3, 4.— -"H. and A. Adams, Gen. Rec. 

 Moll., II, 1857, p. 504.— *MusGRAVE, Phot. Couch., 1863, pi. i, fig. 7.— *Cles- 

 siN, Conch. Cab. Auo., 1875, p. 170, pi. lvi, figs. 1,2. — "P^tel, Couch. Sam., 

 Ill, 1890, p. 182. 



* Margaron (Anodonta) ohtusnJ^'EA,Syn., 1852, p. 51; 1870, p. 82. 



* Anodon ohtusa Catlow and Reeve, Conch. Nom., 1845, p. 67. — ^* Sowerby, 



Couch. Icon., XVII, 1867, pi. xii, fig. 39. 

 "^ Anodonta Valenciennes, Coq. Mar. Biv., 1827?, pi. xi,viii. figs. 3a, 3?>.' 



Brazil ; Paraguay. 



tGLABARIS LITURATUS Spix. 



* Anodon obtusus var. i. lituratum Spix, Test. Fluv. Bras., 1827, p. 30, pi. xxii, fig. 4. 



* Anodonta Utiuraia Hupe, Moll. Kouv., 1857, p. 87, pi. xvii, fig. 4.- 



"" Anodon Uttirata Sowerby, Conch. Icon., XVII, 1868, pi. xx, fig. 78. 



Brazil. 



Section VIRGULA Simpson, 1900. 

 (Type, Glaharis ensiformis Spix.) 



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

 or falcate, rouuded in front, sharply pointed at the i^osterior 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 

 fine, 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. ohtusa. 



-Hupe is certain that this is difi'ereut from obtusus, and says that the small angular 

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

 whether it is more than a variety of obtusus. 



