812 . PBOCEEDINGS OF THE NATIONAL MUSEVM. vol.xxii. 



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



* Unio trirostris Sowerby, Conch. Icon., XVI, 1868, pi. lxv, fig. 331. 



? Unio andersonianus Nevill, Jl. As. Soc, Beng., XLVI, 1877, p. 40; Eesearclies 

 Yun. 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 "Lka, Syn., 1852, p. 36; 1870, p. 58.^ 



*Unio teretiusculus Philippi, Conch., Ill, 1847, p. 45, pi. iii, fig. 3.'' — ""fKusxER, 

 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/ETEL, Conch. Sam., Ill, 1890, p. 169.— * von Martens, Besch. Dents. 

 Ost-Af., 1897, p. 223. 



Unio litJiophagus Zieglep., manuscript, probably. 



Upper Nile drainage. 



NODULARIA LEDOULXIANA Charmes. 



* Unio ledoidxianus CuAKyiKS, Bull. Soc. Mai. Fr., II, 1885, p. 173. — * Bourguignat, 



Moll. Af. Eq., 1889, p. 194.—* von Martens, Besch., 1897, p. 229.^ 



Central Africa. 



NODULARIA GAUDICHAUDI Eydoux. 



* Unio gaudicliaudi Eydoux, Guer. Mag., 1838, p. 10, pi. cxviii, fig. 3. — *H. and A. 



Adams, Gen. Rec. Moll., II, 1857, p. 494.— *PyETEL,Conch. Sam., Ill, 1890, p. 153. 

 ""Margaron ( Unio) gaudicliaudi Lea, Syn., 1850, p. 32; 1870, p. 50. 



Small streams of Bengal. 



NODULARIA KERAUDRENI Eydoux. 



*Unio Iceraitdreni Eydoux, Guer. Mag., 1838, p. 8, pi. cxviii, figs. 1, la. — *H. and 

 A. Adams, Gen. Rec. Moll., II, 1857, p. 494.—* P.etel, Couch. Sam., Ill, 1890, 

 p. 156. 



^Margaron ( Unio) kerandreni Lea, Syn., 1852, p. 30; 1870, p. 46. 



liivers and swamps of Bengal. 



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

 cmr ideas. The Nodularia ca'vulea 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. 



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

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

 his Synopsis. 



■■'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 

 c(eruleus grouji (with which it agrees in everj- essential character) and close to cmrideus 

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

 Ethiopian and Oriental regions. 



'' ITnfigured. Von Martens places it in the grouji of U. ieretiusculus. 



