728 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Vi;i866, p. 23, pi. VII, fig. 21; Obs., XI, 1867, p. 27, pi. vii, fig. 21.— *B. H. 

 Wright, Check List, 1888.— *P^tel, Conch. Sam., Ill, 1890, p. 149. 

 *Margaron {Unto) curatus Lea, Syn., 1870, p. 46. 



* t Unio datus Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 161 ; * Jl. Ac. N. Sci. Phila., 



VI, 1868, p. 299, pi. XLiv, fig. 3 ; * Obs., XII, 1869, p. 59, pi. xliv, fig. 3.—* B. H. 

 Wright, Check List, 1888.— *P/etel, Conch. Sam., Ill, 1890, p. 150. 

 *Mar(jaron ( Unio) datus Lea, Syn., 1870, p. 45. 



* Unio vatus PiETEL, Conch. Sam., Ill, 1890, p. 172. 



* t Unio cuspidatm, Lea, Pr. Ac. N. Sci. Phila., IT, 1872, p.l59 ; * Jl. Ac. N. Sci. Phila., 



VIII, 1874, p. 43, pi. XIV, fig. 50; *Obs., XIII, 1874, p. 47, pi. xiv, fig. 40.— 



* B. H. Wright, Check List, 1888.— *P.i:tel, Conch. Sam., Ill, 1890, p. 150. 



North Carolina to Georgia. 



tUNIO ROANOKENSIS Lea. 



'"Margarita {Unio) roanolensis Lea, Syn., 1836, p. 30; 1838, p. 21. 



* Unio roanokensis Lea, Tr. Am. Phil. Soc, VI, 1838, p. 27, pi. viii, fig. 21; Obs., 



II, 1838, p. 27, pi. VIII, fig. 2].—" Troschel, Arch, fur Nat., V, 1839, Pt. 2, p. 

 235.—* Hanley, Test. Moll., 1842, p. 199; * Biv. Shells, 1843, p. 199.—* Cat- 

 low and Reeve, Conch. Nom., 1845, p. 63.—* Conrad, Pr. Ac. N. Sci. Phila., 

 VI, 1853, p. 275.—* Chenu, 111. Conch., 1858, pi. xx, figs. 6, 6a, 66.-* H. and 

 A. Adams, Gen. Rec. Moll., II, 1857, p.493.— * Sowerby, Conch. Icon., XVI, 

 1868, pi. Lxvi, fig. 341.—* B. H. Wright, Check List, 1888.—* P^etel, Conch. 

 Sam. Ill, 1890, p. 165. 



* Margaron {Unio) Lea, Syn., 1852, p. 32; 1870, p. 51. 



*t Unio macer Lea, Pr. Ac. N. Sci. Phila., I, 1857, p. 86; * Jl. Ac. N. Sci. Phila., 

 VI, 1862, p. 202, pi. XXIX, fig. 271; ^ Obs., IX, 1863, p. 24, pi. xxix, fig. 271. 



* Ma,rgaron { Unio) macer Lea, Syn., 1870, p. 51. 



*t Unio latus Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 171 ; * Jl. Ac. N. Sci. Phila., 

 IV, 1860, p. 334, pi. Liii, fig. 159; * Obs., VIII, 1860, p. 16, pi. liii, fig. 159.— 

 *B. H. Wright, Check List, 1888.—* P^etel, Conch. Sam., Ill, 1890, p. 157. 



* Margaron {Unio) latus Lea, Syn., 1870, p. 57. 



fUNIO ROANOKENSIS var. NORTHAMPTONENSIS Lea. 



* UniQ northamptonensis Lea,i Pr. Ac. N. Sci. Phila., V, 1861, p. 392; *J1. Ac. N. 



Sci. Phila., V., 1862, p. 190, pi. xxv, fig. 260; * Obs., IX, 1863, p. 12, pi. xxv, 

 fig. 260.—* B. H. Wright, Check List, 1888. 

 *Margaron {Unio) nortliamptonensis Lea, Syn., 1870, p. 51. 



Connecticut Eiver at Nortbampton, Massachusetts; south to the 

 Savannah Eiver, Georgia. 



tUNIO HOPETONENSIS Lea. 



* Unio hopetonensis Lea, Tr. Am. Phil. Soc, VI, 1838, p. 29, pi. ix, fig. 24; * Obs., II, 



1838, p. 29, pi. IX, fig. 24.—" Troschel, Arch, fiir Nat., VI, 1839, Pt. 2. p. 235.— 



* Hanley, Test. Moll., 1842, p. 198; * Biv. Shells, 1843, p. 198, pi. xx, fig. 21.— 

 *Catlow and Reeve, Conch. Nom., 1845, p. 60.—* H. and A. Adams, Gen. Kec. 

 Moll., II, 1857, p. 493.— *Chenu, 111. Conch., 1858, pl.xx, figs. 5, 5a, 5?;.— 

 *KusTER, Conch. Cab. Unio, 1861, p. 196, pi. Lxiii, fig. 1.—* Sowerby, 

 Concb. Icon., XVI, 1868, pi. Lxviii, fig. 349.—* B. H. Wright, Check List, 



1 A large, compresserl form, biaugulate behind, the posterior point elevated above 

 the base line. Certain specimens are considerably inflated in the post basal region. 

 This is generally taken for U. complanatus, but it differs in the characters given 

 above, and seems to be merely a northern variety of roanokensis. 



