816 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



NODULARIA SCOBINA Hanley. 



""Unio scoMna Hanley, Biv. Shells, 1856, p. 382, pi. xxiii, fig. 40.'— "* Hanley aud 

 Theobald, Conch. Incl., 1876, p. 22, pi. xlvi, figs. 2, 3.— *P.etel, Conch. Sam., 

 Ill, 1890, p. 167. 



Assam. 



(Group of JSfodularia pazii.) 



Shell thin, with the hinder point long drawn out; posterior ridge 

 double, low, and sharp, the dorsal line above it straight or incurved ; 

 beak sculpture not seen ; surface of the shell smooth, dull olive colored; 

 teeth exceedingly compressed; pseudocardinals long, lamellar. 



tNODULARIA PAZII. 



"" Unto pazii Ij-E,A,Vr. Ac. N. Sci. Phila., VI, 1862, p. 176; *J1. Ac. N. Sci. Phila., 

 VI, 1866, p. 61, pi. XXI, fig. 60; *Obs., XI, 1867, p. 65, pi. xxi, fig. 60.— 

 " SowERBY, Couch. Icon., XVI, 1868, pi. xcii, fig. 502. 



^ Margaron iUnio) pazii Lea, Syn., 1870, p. 39. 



China; Siam; Cambodia. 



NODULARIA JOURDYI L. Morlet. 



* Unio jourclyi Morlet, Jl. de Conch., 1886, p. 289, pi. xiii, figs. 5, 5a. 

 Tonkin. 



t NODULARIA INGALLSIANA Lea. 



* Unio infjallsianus Lea, Tr. Am. Phil Soc, X, 1852, p. 282, pi. xxiv, fig. 41 ; " Obs., 



V, 1852, p. 38, pi. XXIV, fig. 41.—" H. and A. Adams, Gen. Eec. Moll., II, 1857, 

 p. 491. — *Eeeve, Conch. Icon., XVI, 1865, pi. xxvi, fig. 126. — * Morelet, 

 Ser. Conch., IV, 1875, p. 351.— "^P-ETEL, Conch. Sam., Ill, 1890, p. 155. 

 ^ Margaron {Unio) ingalhsianns Lea, Syn., 1852, p. 36; 1870, p. 58. 



Cochin-China; Sii^m; Cambodia. 



(Group of Nodular ia tro)npi.) 



Shell small, subtrapezoidal, wider behind, slightly inflated, with a 

 rounded posterior ridge ; beaks full, sculpture not seen ; surface covered 

 with very fine, nodulous, somewhat zigzag corrugations, with upcurved 

 posterior ridges on the posterior slope; epidermis reddish brown or 

 black; hinge teeth compressed; pseudocardinals vertically striate. 



t NODULARIA TROMPI Drouet and Chaper. 



* Unio trotnpi Drouet aud Chaper, Mem. Soc. Zool. Pr., V, 1892, p. 153, i)l. vi, 



figs. 8-10; Jl. de Conch., XLI, 1893, p. 45. 



Borneo. 



(Group of Nodularia oUvaria.) 



Shell thin, inflated, blue green or olive green, smooth, shining, with 

 two or more faint ridges on the posterior slope; beaks and disk almost 

 or quite destitute of sculpture; teeth greatly compressed, lamellar. 



1 Credited to Benson manuscript. 



