NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 755 



ser., Ill, 1845, p. 16, pi. in, fig. 2. * CATLOW and REEVE, Conch. Norn., 1845, p. 



57. * CONRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 247. *H. and A. ADAMS, 



Gen. Rec. Moll., II, 1857, p. 495. ' B. H.WRIGHT, Check List, 1888.* P^ETKL, 



Conch. Sam., Ill, 1890, p. 149. 



*Margarita ( Unio) cor LEA, Syn., 1836, p. 21; 1838, p. 18. 

 *Margaron ( Unio) cor LEA, Syn., 1852, p. 26; 1870, p. 39. 

 t*J7nio crapulus LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 39; *J1. Ac. N. Sci. 



Phila., VI, 1866, p. 42, pi. xv, fig. 40; * Obs., XI, 1867, p. 46, pi. xv, fig. 



40." B. H. WRIGHT. Check List, 1888. 

 *Margaron ( Unio) crapulus LEA, Syn., 1870, p. 41. 

 t*Pnio leivisii LBA, Pr. Ac. N. Sci. Phila., V, 1861, p. 40; * Jl. Ac. N. Sci. Phila., 



V, 1862, p. 71, pi. vm, fig. 220; *Obs., VIII, 1862, p. 75, pi. vin, fig. 220. 



* B. H. WRIGHT, Check List, 1888. 

 *Maryaron (Unio) leivinii LEA, Syn., 1870, p. 56. 



Alabama River system ; Flint River, Georgia. 



fPLEUROBEMA PEROVATA Conrad. 



* Unio perovatus CONRAD, Am. Jl. of Sci., XXV, 1834, p. 338, pi. L, fig. 3 ; * f New 

 F. W. Shells, 1834, p. 47, pi. n, fig. 3. J FERUSSAC, Guer. Mag., 1835, p.29 

 *MOLLER, Syn. Nov. Gen., 1836, p. 199; "Test. Moll., 1842, p. 190. *HANLEY, 

 Biv. Shells, 1843, p. 190. f CHENU, Bib. Conch., 1st ser., Ill, 1845, p. 22, pi. i, 

 fig. 3.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 254. *H. and A. 

 ADAMS, Gen. Rec. Moll., II, 1857, p. 494. *B. H. WRIGHT, Check List, 1888. 



"Margarita ( Unio) perovatus LEA, Syn., 1836, p. 23; 1838, p. 19. 



Margaron ( Unio) peroratus LEA, Syn., 1852, p. 27; 1870, p. 42. 



Prairie Creek (tributary of the Tombigbee), Marengo County, 

 Alabama. 



fPLEUROBEMA NUCLEOPSIS Conrad. 



Unio nucleopsis CONRAD, Ann. and Mag. Nat. Hist., IV, 1849, p. 301 ; 3 *Pr. Ac. 



N. Sci. Phila., IV, 1849, p. 154; Ml.- Ac. N. Sci. Phila., I, 1850, p. 276, pi. 



xxxvn, fig. 81. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 492. 



"KusTER, Conch. Cab. Unio, 1861, p. 217, pi. LXXIII, fig. 3. * REEVE, Conch. 



Icon., XVI, 1864, pi. xvi, fig. 68. *B. H. WRIGHT, Check List, 1888. 



*PJETEL, Conch. Sam., Ill, 1890, p. 161. 

 * Margarita ( Unio) nucleopsis LEA, Syn., 1852, p. 35; 1870, p. 56. 



Coosa River system. 



tPLEUROBEMA STABILIS Lea. 



1 



*Unio stabilis LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 59; Ml. Ac. N. Sci. Phila., 

 V, 1862, p. 71, pi. vm, fig. 221; *Obs., VIII, 1862, p. 75, pi. vin, fig. 221. 

 *B. H.WRIGHT, Check List, 1888. 



*Margaron ( Unio) siaWis LEA, Syn., 1870, p. 38. 



tUnio mediae LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 40; * Jl. Ac. N. Sci. Phila., 

 V, 1861, p. 78, pl.x, fig. 227; * Obs., VIII, 1862, p. 82, pi. x, fig. 227. * Sow- 

 ERBY, Conch. Icon., XVI, 1868, pi. LXXIII, fig. 375.* B. H. WRIGHT, Check 

 List, 1888. * P.KTEL, Conch. Sam., Ill, 1890, p. 158. 



Margaron ( Unio) medius LEA, Syn., 1870, p. 40. 



Coosa River, Alabama. 



1 This figure differs a good deal from that in the American Journal of Science, and 

 it may be taken from a younger, less inflated shell. 



a Very close to P.irrasa, and it may be that when a sufficient amount of material 

 is examined the two will have to be placed together. 



