932 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. xxn. 



tGLABARIS ENSIFORMIS Spix. 



*J notion ensiformis SPIX, Test. Fluv. Bras., 1827, p. 31, pi. xxiv, figs. 1, 2. 

 *CATIX>W and REEVE, Conch. Nom., 1845, p. 66. * SOWEKBY, Couch. Icon., 

 XVII, 1867, pi. xi, fig. 31. 



* Iridina ensiformis LEA, Syn., 1836, p. 57. 



* Anodonia ensiformis HANLEY, Test. Moll., 1842, p. 223; *Biv. Shells, 1843, p. 



223. * D'ORBIGNY, Voy. Am. Mer., 1843, p. 618, pi. LXXIX, fig. 10. * Kus- 

 TER, Conch. Cab. Ano., 1853, p. 8, pi. n, fig. 12. * H. and A. ADAMS, Gen. Rec. 

 Moll., II, 1857, p. 503. * ? CHENU, Man., 1859, II, p. 146, fig. 721. * P^TEL, 

 Conch. Sam., Ill, 1890, p. 179. 



* Margarita (Anodonta) cnsiformis LEA, Syn., 1838, p. 32. 



* Maryaron (Anodonta) ensiformis LEA, Syn., 1852, p. 51; 1870, p. 82. 



Tropical South America. 1 



t GLABARIS FALSUS Simpson.* 



Yuruari Kiver, a branch of the Orinoco. 



t GLABARIS LEGUMEN von Martens. 



* Anodonta legumen VON MARTENS, S. B. Nat. Fr., 1888, 'p. 65. 

 Southern Brazil. 



The following are unfigured or indeterminate species of Glabaris. 



*Anodon bra-is SOWERBY, Conch. Icon., XVII, 1870, pi. xxxi, fig. 124. 



La Plata, South America. 3 



* Anodon porcifer GRAY, Pr. Zool. Soc. Lond., 1834, p. 58. 



Paraguay. 



* Unio (Anodontes) spixii D'ORBIGNY, Guer. Mag., 1835, p. 39. 4 

 Brazil. 



* Anodon cheeziana SOWERBY, Conch. Icon., XVII, 1867, pi. xv, fig. 52. 

 Probably a Glabaris. 



* Anodonta nicaragua PHILIPPI, Zeits. fur Mai., V, 1848, p. 130. 



Nicaragua. 



1 The three very peculiar species of this section seem to show relationship with G. 

 wheatleyi and G. clessini. 



2 Shell elongated, rather thin, subrhoinboid and pointed at the posterior base, 

 slightly rayed on the low, rounded posterior ridge ; beaks low ; epidermis olive 

 green, somewhat cloth-like; hinge line nearly straight; anterior scars deep; 

 escutcheon small, dark; nacre shaded bluish and greenish, lurid purplish in the 

 center, iridescent behind. Length, 76 mm. ; height, 21 mm. ; diameter, 11 mm. 

 This was supposed by Dr. Lea to be ensiformia and I thought it was that until a 

 more careful examination convinced me of its distinctness. It is a smaller, thinner, 

 more rhomboid shell, and has a somewhat cloth-like epidermis, while that of ensi- 

 formis is smooth. I regret that I can not figure this species, and that I must describe 

 it in a footnote, but I only discovered that it was a distinct species as the Synopsis 

 was about ready for the press. 



3 1 can not tell what this is. If it is a true Glabaris, it would be the type of a 

 group perhaps near G. tenebricosus. 



^D'Orbigny refeas to figures in Spix, but his references are badly mixed up. 



