FOSSITLA 



1397 



tooth ; right valve with two teeth, one in front of the beak, the 

 other behind it; anterior scars impressed; nacre lurid, bkiish 

 to flesh-colored ; prismatic border wide. 



Length 80, height 63.5, diam. 35 mm. 



Length 83, height 57. diam. T,y mm. 



Parana River, South America. 

 Monocondylcea fosskulifera d'ORBiGNY, Guer. Mag., 1835, p. 



38; Voy. Am. Men, 1843, P- 614. pi. i.xxx, figs. 5-7. — 



Clkssin, Conch. Cab. Ano.. 1876, p. 249, pi. xr.xix, figs. 



I, 2. 

 Margarita fMargan'tanaJ fossicnlifera Lea, Syn., 1838, p. 28. 

 Unio fossicnlifera Hanley, Biv. Shells, 1483, p. 213, pi. xxii, 



fig. 19.— SowERP.Y. Conch. Icon., XVI, 1868, pi. xcvi, fig. 



521. 

 Margaron (Monocondylcea) fossicnlifera Lea, Svn., 1852, p. 



45 : 1870. p. 73. ' • ' " 



Fossula fossicnlifera von Ihering, Arch, fiir Nat., 1893, p. 64, 



pi. iiT, fig. 2. — Simpson, Syn., 1900, p. 914. 

 Unio fossicnliferns Cati.ow^ and Reeve, Conch. Norn., 1845, 



P- 59- 

 Anodonta fuscicnlifera P.^^Tel, Conch. Sam., ITL 1890, p. 179. 



The cavities or pits in the hinge of this species are often 

 partly filled with a sort of ligamental matter, which is decidedly 

 pitted. The nacre is often considerably thickened in the front 

 part of the shell. 



Fossur.A BAi.ZANi von Iherins". 



Shell solid, su'binflated, irregularly subtriangular or sub- 

 trapezoid, concentrically subrugose, somewhat inequilateral ; 

 beaks moderately elevated; hinge line sinuous, regularly cre- 

 nate in the middle ; anterior end narrowed, subtruncate'; base 

 curved; posterior end obliquely subtruncate, rounded where 

 It joins the base; epidermis fuscous-olivaceous; nacre lead- 

 colored, wM'th bronzy maculations. 



Length ^6, height 66, diam. 40 mm. 

 ^ Rio Paraguay ; Rio Apae, South America. 

 Fossnla bahani von Iherjng, Arch, fiir Nat., 1893, p. 65, pi. 



Ill, fig. 1.— Simpson, Syn., 1900, p. 914. 



