NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 755 



ser., Ill, 1845, p. 16, pi. iii, fig. 2. — ^ Catlow and Eeeve, Conch. Nom., 1845, p. 



57.— * Conrad, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 247.— *H. and A. Adams, 



Gen. Eec. Moll., II, 1857, p. 495.—^ B. H.Wright, Check List, 1888.—* P^tel, 



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. 

 f'Unio 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. 

 i*Unio lewisii Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 40; * Jl. Ac. N. Sci. Phila., 



V, 1862, p. 71, pi. VIII, fig. 220; ^Ohs., VIII, 1862, p. 75, pi. viii, fig. 220.— 



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

 *Margaron {Unio) leioisii Lea, Syn., 1870, p. 56. 



Alabama Eiver system ; Flint Eiver, Georgia. 



tPLEUROBEMA PEROVATA Conrad, 



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

 F. W. Shells, 1834, p. 47, pi. ii, fig. 3.'— Ferussac, Guer. Mag., 1835, p. 29— 



* MoLLER, Syn. Not. Geu., 1836, p. 199; *Test. Moll., 1842, p. 190.— 'Hanley, 

 Biv. Shells, 1843, p. 190.— ■ 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) perovatus Lea, Syn., 1852, p. 27; 1870, p. 42. 



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

 Alabama. 



tPLEUROBEMA NUCLEOPSIS Conrad. 



Unio nucleopsis Conrad, Ann. and Mag. Nat. Hist., IV, 1849, p. 301; ^ ^'Pr. Ac. 

 N. Sci. Phila., IV, 1849, p. 154; *J1. Ac. N. Sci. Phila., I, 1850, p. 276, pi. 

 xxxvii, fig. 81. — *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 492. — 

 "KusTER, Conch. Cab. Unio, 1861, p. 217, pi. lxxiii, fig. 3.—* Eeeve, Conch. 

 Icon., XVI, 1864, pi, xvi, fig. 68.— *B. H. W^right, Check List, 1888.— 

 *P^TEL, Conch. Sam., Ill, 1890, p. 161. 



* Margarita {Unio) nucleopsis Lea, Syn., 1852, p. 35; 1870, p. 56. 



Coosa Eiver system. 



tPLEUROBEMA STABILIS Lea. 



*Unio stahilis Lea, Pr. Ac, N. Sci. Phila., V, 1861, p. 59; *J1. Ac. N. Sci. Phila., 

 V, 1862, p. 71, pi. viii, fig. 221;= *Obs., VIII, 1862, p. 75, pi. viii, fig. 221.— 



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



* Margaron ( Unio) stahilis Lea, Syn., 1870, p. 38. 



\Unio medius Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 40; * Jl. Ac. N. Sci. Phila., 

 V, 1861, p. 78, pi. 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^TEL, Conch. Sam., Ill, 1890, p. 158. 



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



Coosa Eiver, Alabama, 



' This fignre differs a good deal from that in the American Journal of Science, and 

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



^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. 



