728 PROCEEDINGS OF THE NATIONAL Ml'SKI'M. TOL.XXU. 



VI. 1866, p. 23, pi. vu, fig. 21; Obs., XI, 1867, p. 27, pi. VH, fig. 21.-*!'. It. 

 WRIGHT, Check List, 1888. *P/KTEL, Conch. Sam., Ill, 1890, p.149. 

 "Mart/aron (Unio) curatus LEA, Syn., 1870, p. 46. 



* t Unio daius 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*:TEL, Conch. Sam., Ill, 1890, p. 150. 

 *Mar<jaron ( Unio) datits LEA, Syn., 1870, p. 45. 



* Unio ratns P.fcTEL, Conch. Sam., Ill, 1890, p. 172. 



/ nio cuspidal us, LEA, Pr. Ac. N. Sci. Phila., II, 1872, p.159 ; * 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.*:TEL, Conch. Sam., Ill, 1890, p. 150. 



North Carolina to Georgia. 



tUNIO ROANOKENSIS Lea. 



* Margarita (Unio) roanokensis LEA, Syu., 1836, p. 30; 1838, p. 21. 



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



II, 1838, p. 27, pi. vm, fig. 21.* TROSCHEL, Arch, fiir Nat., V, 1839, Pt. 2, p. 

 235.* HANLEV, Test. Moll., 1842, p. 199; *Biv. Shells, 1843, p. 199. * CAT- 

 LOW and REEVE, Conch. Norn., 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. * SOWERUY, 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. 



* Maryaron (J'nio) 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. 



* Maryaron ( Unio) latus LEA, Syn., 1870, p. 57. 



fUNIO ROANOKENSIS var. NORTHAMPTONENSIS Lea. 



* Unif northamptonensis LEA,' 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. xx v, 

 fig. 260.* B. H. WRIGHT, Check List, 1888. 

 *Margaron (Unio) northamptonensis LEA, Syn., 1870, p. 51. 



Connecticut Kiver at Northampton, Massachusetts: south to the 

 Savannah River, 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. Noin.. 1845, p. 60. *H. and A. ADAMS, Gen. Rec. 

 Moll., II, 1857, p. 493. *CHENU, 111. Conch., 1858, pl.xx, figs. 5, 5a, 57;. 

 *KUSTER, Conch. Cab. Unio, 1861, p. 196, pi. LXIII, fig. 1. * So WEBBY, 

 Conch. Icon., XVI, 1868, pi. LXVIII, fig. 349.* B. H. WRIGHT, Check List, 



1 A large, compressed form, biangulate behind, the posterior point elevated above 

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

 This is generally taken for I', cojnplanalitx, but it differs in the characters given 

 above, and- seems to be merely a northern variety ofroanokemis. 



