914 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xsii. 



IHERINGELLA BALZANI von Ihering. 



* Plagiodon halzani VON Ihering, Arch, flir Nat.., 1893, j). 69, pi. iii, fig. 3. 

 Eio Paraguay; San Paulo, Brazil. 



Genus FOSSULA Lea, 1870. 

 (Type, Monocondylcea fossicuUfera d'Orbigny.) 



Fossula Lea, Syii., 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. 



* Monocondylcea fossicuUfera d'Orbigny, Guer. Mag., 1835, p. 38 ; * Voy. Am, Mer., 



1843, p. 614, pi. Lxxx, figs. 5-7.—* H. and. A. Adams, Gen.Eec. Moll., II, 1857, p. 

 501.—* Clessin, Conch. Cab. Ano., 1876, p. 249, pi. XLXix, figs. 1, 2.—* P.etel, 

 Conch. Sam., Ill, 1890, p. 1 74. 



* Margarita (Margaritana) fossicuUfera Lea, Syn., 1838, p. 28. 



* Unio fossicuUfera IIanley, Test. Moll., 1842, p. 213 ; '' Biv. Shells, 1843, p. 213, pi. 



XXII, fig. 19. — * Sowerby, Conch. Icon., XVI, 1868, pi. xcvi, fig. 521. 

 '" Margaron {Monocondylcea) fossicuUfera Lea, Syn., 1852, p. 45; 1870, p. 73. 



* Fossula fossicuUfera von Ihering, Arch, fiir Nat., 1893, p. 64, pi. iii, fig. 2. 



* Unio fossiculiferus Catlow and Eeeve, Conch. Norn., 1845, p. 59. 



* AnodoniafuscicuUfera P.etel, Conch. Sam., Ill, 1890, p. 179. 



Parana Eiver, South America. 



FOSSULA BALZANI von Ihering. 



* Fossula halzani von Ihering, Arch, fiir Nat., 1893, p. 65, pi. iii, fig. 1. 

 Eio Paraguay; Rio Apae, South America. 



Genus LEILA Gray, 1840. 



(Type, Anodonia Mainvilleana Lea.) 



Coluniba Lea (not Columba liinnsBUS, aves, 1758), 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 sinns.' 



' Conchologically this genus seems to be very closely related to Glaharis, especially 

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

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



