816 PROCEEDINGS OF THE XATIOXAL MUSEUM. VOL.XXU. 



NODULARIA SCOBINA Hanley. 



'Unio seolnna HANLEY, Biv. Shells, 1856, p. 382, pi. xxm, tig. 40.' HANLKY and 

 THEOBALD, Conch. Ind., 1876, p. 22, pi. XLVI, tigs. 2, 3. * P.ETEL, Conch. Sam., 

 Ill, 1890, p. 167. 



Assam. 



(Group of Nodularia paaii.) 



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; pseudocardiuals long, lamellar. 



t NODULARIA PAZII. 



-Unio pazii LEA, Pr. 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, Conch. Icon., XVI, 1868, pi. xcu, fig. 502. 



* Margaron ( Unio) pazii LEA, Syn., 1870, p. 39. 



China; Siain; Cambodia. 



NODULARIA JOURDYI L. Morlet. 



* Unlo joiirdyi MOKLET, Jl. do Conch., 1886, p. 289, pi. xin, figs. 5, 5a. 

 Tonkin. 



t NODULARIA INGALLSIANA Lea. 



" Unio intjallsianun 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. Rec. Moll., II, 1857, 

 p. 491. * REEVE, Couch. Icon., XVI, 1865, pi. xxvi, fig. 126. * MOUELET, 

 Ser. Couch., IV, 1875, p. 351. *P.ETEL, Conch. Sam.. Ill, 1890, p. 155. 



"Margaron (Unio) inyallsianus LEA, Syn., 1852, p. 36; 1870, p. 58. 



Cochin-China; Siian; Cambodia. 



(Group of Nodular ia trompi.) 



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 trompi DROUET and CHAFER, Mem. Soc. Zool. Fr., V, 1892, p. 153, pi. vi, 

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



Borneo. 



(Group of Nodularia olivaria.) 



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 Beusou manuscript. 



