708 PBOCEEBINGS OF THE NATIONAL MUSEUM. 



*t Unio corvus Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 112; *J1. Acad. N. Sci., 



Phila., IV, 1859, p. 217, pi. xxvii, lig. 97; Obs.,VII, 1859, p. 35, pi. xxvii, fig. 



97.— 'SowERBY, CoDch. Icon., XVI, 186S, pi. Lxxvni, fig. 411. — *B. H. 



Wkight, Check List, 1888.— " P^tel, CoDch. Sam., Ill, 1890, p. 149. 

 ^Margaron ( Unio) corvus Lea, Syn., 1870, p. 37. 

 '^ Unio vestitus Lea, Pr. Ac. N. Sci., Phila., V, 1861, p. 393; * Jl. Ac. N. Sci., Phila., 



V, 1862, p. 189, pi. XXV, fig. 259; *Obs., IX, 1863, p. 11, pi. xxv, fig. 259.— 



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

 Margaron ( Unio) vestiius Lea, Syn., 1870, p. 50. 



Streams from the Congaree Eiver, South Carolina, south to northern 

 Florida. 



tUNIO DANIELSII B. H. Wright. 



* Unio danielsii B. H. Wright, Naut., XIII, 1899, p. 31. 

 Spring Creek, Decatur County, Georgia. 



tUNIO PUSILLUS Lea.i 



* Uniointsillus Lea, Pr. Ac. N. Sci. Phila., 1,1840, p. 286; * Tr. Am. Phil. Soc, VIII, 



1842, p. 220, pi. XVIII, fig. 36; * Obs., Ill, 1842, p. 58. pi. xviii, fig. 36.—* Con- 

 rad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 256.—* H. and A. Adams, Gen. Rec. 

 Moll., II, 1857, p. 494.—* Chenu, 111. Conch., 1858, pi. xxxii, figs. 5, 5a, 5b.— 

 * KusTER, Conch. Cab., 1861, p. 197, pi. lxiu, figs. 3, 4.—* B. H.Wright, Check 

 List, 1888.—* P^TEL, Conch. Sam., Ill, 1890, p. 164.—* Simpson, Pr. U. S. Nat. 

 Mus., XV, 1892, p. 411. pi. li, figs. 2, 6. 



"Margaron ( Unio) pusillus Lea, Syn., 1852, p. 31; 1870, p. 48. 



*iUnio huxeus Lea, Tr. Am. Phil. Soc, X, 1852, p. 261, pi. xv, fig. 13; *Obs.,V, 

 1852, p. 17, pi. XV, fig. 13.—" Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 245.— 

 *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 493.— *B. H. Wright, Check 

 List, 1888.— *PyETEi,, Conch. Sam., Ill, 1890, p. 147. 



*Margaron ( Unio) huxeus Lea, Syn., 1852, p. 29; 1870, p. 46. 



* t Unio antlionyi Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 41 ; *J1. Ac. N. Sci. Phila., V, 



1862, p. 197, pi. XXVII, fig. 266; * Obs., IX, 1863, p. 19, pi. xxvii, fig. 266.— *B. H. 

 Wright, Check List, 1888. 

 Margaron {Unio) antlionyi. Lea, Syn., 1870, p. 43. 



Abbeville district, South Carolina; south to northern Florida. 



tUNIO MERUS Lea. 



* Unio merus Lea, Tr. Am. Phil. Soc, X, 1852, p. 260, pi. xv, fig. 10; ■ Obs., V, 



1852, p. 16, pi. XV, fig. 10.—" Conrad, Pr. Acad. N. Sci. Phila., VI, 1853, 

 p. 252.— * B. H. Wright, Check List, 1888.— * Pjetel, Conch. Sam., Ill, 

 1890, p. 159. 



* Margaron ( Unio) merus Lea, Syn., 1870, p. 54. 



*t Unio castus Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 306; * Jl. Ac. N. Sci. 

 Phila., IV, 1860, p. 349, pi. lvii, fig. 174; * Obs., VIII, 1860, p. 31, pi. LVii, 

 fig. 174.—* B. H. Wright, Check List, 1888. 



* Margaron ( Unio) castus Lea, Syn., 1870, p. 40. 



South Carolina. 



1 The type is a young shell identical with one of Lea's U. antlionyi. The type of 

 the latter is a little larger, lighter colored, and less rayed. 



