812 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XXII. 



* Margaron ( Unio) evitatus LEA, Syn., 1870, p. 47. 



* Unio trirostris SOWERBY, Conch. Icon., XVI, 1868, pi. LXV, fig. 331. 



f Unio andersonianus NEVILL, Jl. As. Soc. Beng., XLVI, 1877, p. 40; Researches 

 Ynn. Exp. 1877, p. 900, pi. LXXX, figs. 8, 12. ' 



India; southeast Asia. 



tNODULARIA TERETIUSCULA Philippi. 



* Margarita ( Unio) cailliaudi LEA, Syn., 1838, p. 24. 



* Margaron ( Unio) cailliaudi LEA, Syn., 1852, p. 36; 1870, p. 58. 2 



" Cnio ieretiusculus PHILIPPI, Conch., Ill, 1847, p. 45, pi. in, fig. 3. 3 *?KUSTER, 

 Conch. Cab., 1856, p. 133, pi. xxxv, fig. 5.* SowERBY,Conch. Icon., XVI, 1868, 

 pl.Lxxv, fig. 389. * JICKELI, Faun. N. O. Af., 1874, p. 276, pi. xi, figs. 1-3. 

 "P.KTEL, Conch. Sam., Ill, 1890, p. 169. * vox MARTENS, Besch. Dents. 

 Ost-Af., 1897, p. 220. 



Unio lithophagns ZIEGLER, manuscript, probably. 



Upper Nile drainage. 



NODULARIA LEDOULXIANA Charmes. 



* Unio ledoulxianits CHARMES, Bull. Soc. Mai. Fr., II, 1885, p. 173. * BOURGUIGXAT, 



Moll. Af. Eq., 1889, p. 194.* vox MARTENS, Besch., 1897, p. 229.* 



Central Africa. 



NODULARIA GAUDICHAUDI Eydoux. 



* Unio gaudichaudi EYDOUX, Guer. Mag., 1838, p. 10, pi. cxvni, fig. 3. *H. and A. 



ADAMS,Gen. Rec. Moll., II, 1857, p. 494. *P/ETEL,Conch. Sam., Ill, 1890, p. 153. 



* Margaron ( Unio) gaudichaudi LEA, Syn., 1850, p. 32; 1870, p. 50. 



Small streams of Bengal. 



NODULARIA KERAUDRENI Eydoux. 



*Unio keraiidreni EYDOUX, Guer. Mag., 1838, p. 8, pi. cxviu, figs. 1. la. *H. and 

 A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494.* P.ETEL, Conch. Sam., Ill, 1890, 

 p. 156. 



' Margaron ( Unio) keraiidreni LEA, Syn., 1852, p. 30; 1870, p. 46. 



Itivers and swamps of Bengal. 



'I have not seen the figure of andersonianm, but Nevill states that it is near 

 ccei'iileus. The Nodularia cicrulea is an abundant and very widely distributed form, 

 and therefore quite variable in size, form, solidity, color, and sculpture, and it is 

 possible that other so-called species should be merged with it. Some of the above 

 might rank as varieties, but I can hardly separate them. 



2 Lea credits this name to Ferussac manuscript. So far as I know neither Ferussac 

 or anyone else has ever described it. Lea makes U. ieretiusculus a synonym of it in 

 his Synopsis. 



3 Philippi's figure is a little more rounded posteriorly than are any of the shells I 

 have seen from Africa bearing this name. After a critical comparison of numerous 

 specimens, which are undoubtedly of African origin, I can only place this in the 

 caarulews group (with which it agrees in every essential character) and close to cceruleus 

 itself. There are other undoubtedly close relations between species of Naiades of the 

 Ethiopian and Oriental regions. 



4 Unfignred. Von Martens places it in the group of U. ieretimculus. 



