916 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxh. 



LEILA SPIXII von Ihering. 



* Anodon giganteus Spix (part), Test. Fluv. Bras., 1827, p. 27, pi. xix, tig. 1 (young). 

 ""Anodonta gigantea Kuster, Conch. Cab. Ano. 1853, p. 6, pi. i, fig. 2 (young). 

 * Columba sjjwii von Ihering, Arch, flir Nat., 1890, p. 135, pi. ix, fig. 4. 



Amazon River. 



Genus GLABARIS Gray, 1847. 

 (Type, Anodonta exotica Lamarck.) 

 Glabaris Gray, Pr. Zool. Soc. Lond., 1847, p. 197. 



Shell rounded to elongated, inflated, subsolid; beakw full, smooth; 

 epidermis smooth or clothlike, rarely having faint rays; hinge line 

 straight or slightly curved, edentulous, sometimes a little sinuous, the 

 escutcheon distinct and large; nacre soft tinted, the prismatic border 

 wide and well defined. 



Animal with the marsupium occupying the whole of the inner 

 branchiae, which are united their entire length to the abdominal sac; 

 palpi generally semicircular or kidney shaped; attached along their 

 entire upper length, not projecting posteriorly; branchial and anal 

 openings with or without papilhe, not united into siphons in the speci- 

 mens examined, separated by a strong bridge; superanal opening not 

 closed below. 



Section GLABARIS Gray, 1847 

 (Type, Anodonta exotica Lamarck.) 



Shell rounded to elliptical; posterior ridge low or wanting. 

 (Group of Glaharis patagonicus.) 



Shell solid, inflated, obovate, usually somewhat produced behind the 

 center of the base; beaks quite full, projecting above the hinge line; 

 epidermis olive brown, rather smooth, generally ray less ; an-terior muscle 

 scars well defined. 



Animal with the gills large, rounded below; palpi rather large; 

 mantle thickened at edge and furnished with palpi in front of the 

 branchial opening; branchial opening large, with numerous minute 

 papillie; anal opening large, with no papillae. 



t GLABARIS PATAGONICUS Lamarck. 



'^Anodonta patagonica Lamarck, An. sans. Vert., VI, 1819, p. 88. — * Lamarck, Enc. 

 M6th., II, 1827, p. 147, pi. 203, fig. 1.—* Stark, Nat, Hist., II, 1828, p. 89.— 

 *HANLEY,Test. Moll., 1842, p. 221 ; *Biv. Shell8,1843, p. 221.— *KusTER,Conch. 

 Cab. Ano., 1853, p. 50, pi. xii, fig. 2.— *H. and A. Adams, Gen. Rec. Moll., II, 

 1857, p. 504.— *VON Martens, Mai. Blatt., XV, 1868, p. 198.— *P^tel, Conch. 

 Sam., Ill, 1890, p. 183. 



*Margarita (Anodonta) patagonica Lea, Syn., 1836, p. 52; 1838, p. 31, 



*Anodon patagonica Catlow. and Eeeve, Couch. Nom., 1845, p. 67. 



*Margaron {Anodonta) patagonica Lea, Syn., 1852, p. 51; 1870, p. 82. 



