NO. 1205. SYJStOPSIS OF THE NAIADES— SIMPSON. 709 



UNIO MASONI Conrad.i 



* Unio masoni Conrad, New F. W, Shells, 1834, p. 34, pi. v, fig. 2, p. 70.— *Fer- 



USSAC, Guer. Mag., 1835, p. 29.— *Conkad, Monog., Ill, 1836, p. 28, pi. xii, fig. 

 2.—'^ MoLLER, Syn. Nov. Gen., 1836, p. 204.—* Hanley, Test. Moll., 1842, p. 201 ; 

 *Bi . Shells, 1843, p. 201, pi. xxiii, fig. 18.— '*Catlow and Eeeve, Conch. 

 Norn., 1845, p. 61.— *Chenu, Bib. Conch., 1st ser., Ill, 1845, p. 18, pi. ii, fig. 

 1. — TRUSTER, Conch. Cab. Unio, 1852, p. 34, pi. v, fig. 6.—* Conrad, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 2.52.— H. and A. Adams, Gen. Eec. Moll., II, 1857, 

 p. 492.— *B. H. Wright, Check List, 1888.— *PiETEL, Conch. Sam., Ill, 1890, 

 p. 158. 



* Margarita ( Unio} masoni Lea, Syn., 1836, p. 33; 1838, p. 23. 



* Margaron ( Unio) masoni Lea, Syn., 1852, p. 34; 1870, p. 55. 



Savannah Eiver, Georgia. 



tUNIO FRATERNUS Lea. 



* Unio fraternus Lea, Tr. Am. Phil. Soc, X, 1852, p. 263, pi. xvi, fig. 15; *0b8., V,. 



1852, p. M, pi. XVI, fig. 15.— * Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, 

 p. 249.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 493.— *Kuster, 

 Conch. Cab. Unio, 1861, p. 201, pi. Lxvii, fig. 2.— *B. H. Wright, Check List, 

 1888.— " P.ETEL, Conch. Sam., Ill, 1890, p. 153. 

 "" Margaron ( Unio) fraternus Lea, Syn., 1852, p. 32; 1870, p. 51. 



Abbeville district, South Carolina, to Columbus, Georgia. 



tUNIO CONGARiEUS Lea. 



''Unio congarmis Lea, Tr. Am. Phil. Soc, IV, 1831, p. 72, pi. vi, fig. 4; Obs., I, 



1834, p. 82, pi. VI, fig. 4.— *CONRiiD, New F. W. Shells, 1834, p. 68.—* Fekus- 



SAC, Guer. Mag., 1835, p. 26.—* Conrad, Monog., Ill, 1836, p. 27, pi. xii, fig. 



L—* Hanley, Test. Moll., 1842, p. 200; *Biv. Shells, 1843, p. 200, pi. xxii, fig. 



31. — * Catlow and Reeve, Conch. Nom., 1845, p. 57. — * Conrad, Pr. Ac. N. Sci. 



Phila., VI, 1853, p. 247.— * H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 



493. — *Chenu, 111. Conch., 1858, pi. in, figs. 5, 5a, 5&.— -*Sowerby, Conch. 



Icon., XVI, 1867, pi. lix, fig. 296.— *B. H. Wright, Check List, 1888.— 



*Pjltel, Conch. Sam., Ill, 1890, p. 148. 

 ^Margarita {Unio) congarauis Lea, Syn., 1836, p. 32; 1838, p. 22. 



* Margaron (Unio) congarams Lea, Syn., 1852, p. 33; 1870, p. 54. 



*t Unio fnlvus Lea,^ Tr. Am. Phil. Soc, V, p. 96, pi. xiii, fig. 39; *Obs., I, 1834 

 p. 208, pi. XIII, fig. 39.—* Ferussac, Guer. Mag., 1835, p. 29.—* Hanley, Test. 

 Moll., 1842, p. 200; * Biv. Shells, 1843, p. 200, pi. xxiii, fig. 32.—* Catlow and 

 Reeve, Conch. Nom., 1845, p. 59. — *H. and A. Adams, Gen. Rec. Moll., II, 

 1857, p. 493.— *Sowerby, Conch. Icon., XVI, 1858, pi. Lxxxix, fig. 483.— 

 ^B. H. Wright, Check List, 1888.—* P^etel, Conch. Sam., Ill, 1890, p. 153. 



* Margarita ( Unio) falvus Lea, Syn., 1836, p. 32 ; 1838, p. 22. 



* Margaron (Unio) fulvns Lea, Syn., 1852, p. 33; 1870, p. .54. 



Cape Fear River, North Carolina; south to Savannah, Georgia. 



'I have never seen this species, but should judge from the figure that it groups 

 with U. crassidens. 



2 The type is a young shell, and is not the same as adult shells which are in the 

 Lea collection under that name. 



