758 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. xxn. 



* Margarita ( Unio) rubellus LEA, Syn., 1836, p. 33 ; 1838, p. 28. 



*Margaron ( Unio) rubellun LEA, Syn., 1852, p. 34 ; 1870, p. 55. 



t * Uniorudia CONRAD, ' Monog., No. 9, 1837, p. 76, pi. XLIII, fig. 1. *B. H. WRIGHT, 

 Check List, 1888. 



\*Un\o pulmnulus LEA, Pr. Am. Phil. Soc., IV, 1845, p. 164; *Tr. Am. Phil. Soc., 

 X, 1848, p. 81, pi. vni, fig. 24; * Obs., IV, 1848, p. 55, pi. vin, fig. 24.* CONRAD, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 255. * II. and A. ADAMS, Gen. Eec. Moll., 



II, 1857, p. 495.* B. H. WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., 



III, 1890, p. 164. 



*Margaron (Unio) pulmnulus LEA, Syn., 1852, p. 26; 1870, p. 41. 



Black Warrior and Cahawba rivers, Alabama. 



t PLEUROBEMA FURVA Conrad.* 



*Unio furvus CONRAD, New F. W. Shells, 1834, p. 39, pi. vi, fig. 3, page 69. 

 * FERUSSAC, Guer. Mag., 1835, p. 29.* M6LLER, Syn. Nov. Gen., 1836, p. 205. 

 *CHENU, Bib. Conch., 1st ser., Ill, 1845, p. 20, pi. 11, fig. 4. * CONRAD, Pr. 

 Ac. N. Sci. Phila., VI, 1853, p. 250.* B. H. WRIGHT, Check List, 1888. 



Black Warrior Eiver, Alabama. 



t PLEUROBEMA AVELLANA Simpson. 



*Pleurobema avellana SIMPSON, Pr. Ac. N. Sci. Phila., 1900, p. 81, pi. n, figs. 6, 7. 

 Cahawba Eiver, Alabama. 



t PLEUROBEMA NUX Lea. 



* Unio nux LEA, Tr. Am. Phil. Soc., X, 1852, p. 283, pi. xxiv, fig. 43 ; * Obs. V, 1852, 



p. 39, pi. xxiv, fig. 43.* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. 



*B. H. WRIGHT, Check List, 1888. * P^TEL, Conch. Sam., Ill, 1890,p. 161. 

 *Margaron ( Unio) nux LEA, Syn., 1852, p. 31; 1870, p. 49. 

 t Unio cinnamomicus LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 39; * Jl. Ac. N. Sci. 



Phila., V, 1862, p. 100, pi. xvi, fig. 248; *Obs., VIII, 1862, p. 104, pi. xvi, tig. 



248. * SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXIII, fig. 438. *B. H. 



WRIGHT, Check List, 1888. 



* Margaron ( Unio) cinnamomicus LEA, Syn., 1870, p. 49. 



Alabama Eiver system. 



f PLEUROBEMA PINKSTONI S.H.Wright. 



* Unio pinlfstoni S. H. WRIGHT, Nantilus, X, 1897, p. 136. 



* Pleurobema pinksloni SIMPSON, Pr. Ac. N. Sci. Phila., 1900, p. 81, pi. I, fig. 8. 



Alabama Eiver system. 



1 Conrad says that U. ravenelianus of Lea is the same as his U. rudus, which, accord- 

 ing to Ravenel, is found in the French Broad River, though Conrad obtained his 

 species in the Black Warrior. The species of Conrad is, however, quite distinct from 

 that of Lea, the two never occurring in the same drainage system. 



2 1 have seen what I believe are specimens of this species from the collections of 

 the Hon. T. H. Aldrich and Mr. Bryant Walker, taken from the Black Warrior 

 River, Alabama, but I think it riot improbable that it may run into P. rubella. 



