914 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XXII. 



IHERINGELLA BALZANI von Ihering. 



* Plagiodon balzani vox IHERING, Arch, fur Nat., 1893, p. 69, pi. in, fig. 3. 

 Eio Paraguay; San Paulo, Brazil. 



Genus FOSSULA Lea, 187O. 

 (Type, Monocondyla'afossiculifera d'Orbigny.) 

 Foasula LEA, Syn., 1870, p. 72 (footnote). 



Shell obovate, inflated, solid, with rather high beaks and a low 

 posterior ridge; epidermis olive brown, somewhat smooth, sometimes 

 slightly rayed; there is an irregular tooth in the left valve under the 

 beak, and behind it a cavity; in the right valve there is a cavity under 

 the beak, and an irregular tooth in front of and another behind it; 

 the teeth and cavities are generally partly covered with brownish or 

 amber colored matter, and more or less pitted; anterior cicatrices well 

 marked, united; posterior faint; prismatic border wide. 

 Animal unknown. 



t FOSSULA FOSSICULIFERA d'Orbigny. 



* Monocondylwa fossiculifera D'ORBIGNY, Gner. Mag., 1835, p. 38; * Voy. Am. Mer., 



1843, p. 614, pi. LXXX, figs. 5-7.* H. and. A. ADAMS, Gen.Rec. Moll., II, 1857, p. 

 501. * CLESSIN, Concli. Cab. Ano., 1876, p. 249, pi. XLXIX, figs. 1, 2. * P/RTEL, 

 Conch. Sam., Ill, 1890, p. 174. 



* Margarita (Margaritana) fossiculifera LEA, Syn., 1838, p. 28. 



* Unio fossiciilifera HANLEY, Test. Moll., 1842, p. 213 ; * Biv. Shells, 1843, p. 213, pi. 



xxii, fig. 19. * SOWERHY, Conch. Icon., XVI, 1868, pi. xcvi, fig. 521. 



* Margaron (Monocondyhra) fossiculifera LEA, Syn , 1852, p. 45; 1870, p. 73. 



* Foasula fossiculifera VON IHERING, Arch, fiir Nat., 1893, p. 64, pi. in, fig. 2. 



* Cuiofossiculiferus CATLOW and REEVE, Conch. Nom., 1845, p. 59. 



* Anodonlafnsciculifera PJETEL, Conch. Sam., Ill, 1890, p. 179. 



Parana River, South America. 



FOSSULA BALZANI von Ihering. 



* Fossula balzani vox IHERING, Arch, fur Nat., 1893, p. 65, pi. in, fig. 1. 

 Eio Paraguay; Rio Apae, South America. 



Genus LEILA Gray, 184O. 

 (Type, Anodonla MainriUeana Lea.) 



Columba LEA (not Columla Linn;uus, aves, 175S), Tr. Am. Phil. Soc., V, 1833, p. 78. 

 Leila GRAY, Syn. Brit. Mus., 1840, p. 142. 



Shell large, obovate, inflated, with a straight hinge line which is 

 produced into a slight wing before and behind, the posterior end 

 bluntly pointed and somewhat truncate above, with a faint posterior 

 ridge; beaks full, smooth, epidermis olive, generally smooth; hinge 

 edentulous; beak cavities rather shallow; dorsal scars small and 

 numerous, running in a straight line from behind the beaks downward 

 and forward; posterior muscle scars united, large; palleal line gen- 

 erally showing a shins.' 



1 Conchologically this genus seems to be very closely related to Glabaris, especially 

 to the group of G. trnpesiaHs. Some of the shells of that genus have a slight dorsal 

 wing in front and behind, and traces of a palleal sinus. 



