740 PROCEEDINGS OF THE NATIONAL MUSEUM. 



* Margarita (Unio) tetralasmus Lea, Syn., 1836, p. 30; 1838, p. 21. ' 

 ^Margarcn ( Unto) tetralasmus Lea, Syn., 1852, p. 32; 1870, p. 50. 



* Umo excultus Conrad, Monog., XI, 1838, p. 99, pi. Liv, fig. 1; Pr. Ac. N. Sci, 



Phila., VI, 1853, p. 249.—* P^tel, Conch. Sam., Ill, 1890, p. 152. 



* i Unio parallelus Conrad, Pr. Ac. N. Sci. Phila., I, 1841, p. 20; * Jl. Ac. Phila., 



VIII, 1842, p. 179.' 



*tCwio symmetricHs Lea, Pr. Am. Phil. Soc, IV, 1845, p. 164; ^^rr. Am. Phil. Soc, 

 X, 1853, p. 73, pi. IV, fig. 11 ; *0b8., IV, 1848, p. 47, pi. iv, fig. 11.— 'Conrad, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 258.—* H. and A. Adams, Gen. Rec. Moll., IF, 

 1857, p. 493.— "^ B. H. Wright, Check List, 1888.— '^ P^tel, Conch. Sam., Ill, 

 1890, p. 169. 



*Margaron ( Unio) symmetricus Lea, Syn., 1852, p. 32 ; 1870, p. 52. 



* t Unio 2}or rectus Conrad, Jl. Ac. N. Sci. Phila., 1854, p. 296, pi. xxvi, fig. 7. — * B. H. 



Wright, Check List, 1888. 



* t Unio sulcroceus Conrad, Jl. Ac. N. Sci. Phila., VII, 1854, p. 297, pi. xxvii, fig. 1. 



* Unio jamesianus Lea, Pr. Ac. N. Sci. Phila., I, 1857, p. 84 ; *J1. Ac. N. Sci. Phila., 



IV, l''5S, p. 53, pi. VI, fig. 35; * Obs., VI, 1858, p. 52, pi. vi, fig. 35.— *B. H. 

 Wright, Check List, 1888. 

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



tUNIO TETRALASMUS var. CAMPTODON Say. 



* Unio camptodon Say, Am. Conch., V, 1832, pi. xiii. — * Conrad, New F. W. Shells, 



1834, p. 68.— *Ferussac, Guer. Mag., 1835, p. 26.— *Hanley, Test. Moll., 

 1842, p. 198 ; * Biv. Shells, 1843, p. 198, pi. xxi, fig. 17.—* Chenu, Bib. Conch., 

 1st ser., Ill, 1845, p. 53, pi. xiv, figs. 2, 2a, 2h. — *Catlow and Rkea'e, 

 Conch. Norn., 1845, p. 56.— ' Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 246.— 

 *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 492. — * Sowerby, Couch. 

 Icon., XVI, 1868, pi. Lxx, fig. 356.— *B. H. Wright, Check List, 1888.— 

 *P^tel, Conch. Sam., Ill, 1890, p. 147. — *Stearns, Pr. U. S. Nat. Mus , 

 XIV, 1891, p. 105. 



* Margarita (Unio) camptodon Lea, Syn., 1836, p. 30; 1838, p. 21. 

 "" Margaron (Unio) camptodon Lea, Syn., 1852, p. 32; 1870, p. 50. 



*\Unio geometricus Lea, Tr. Am. Phil. Soc, V, 1832, p. 38, pi. iv, fig. 10; * Obs., 

 I, 1834, p. 150, pi. IV, fig. 10. 



tUNIO TETRALASMUS var. MANUBIUS Gould. 



* Unio manubius Gould, Pr. Bost. Soc. Nat. Hist., V, 1856, p. 229; *Otia Couch., 



1862, p. 218.— *B. H. Wright, Check List, 1888.— * Fischer and Crosse, 

 Miss. Sci., Pt. 7, II, 1894, p. 592. 



* Margaron ( Unio) manuhius Gould, Syn., 1870, p. 54, 



* Unio manubrius PiETEL, Conch. Sam., Ill, 1890, p. 158. 



tUNIO TETRALASMUS var. DECLIVIS Say. 



Unio declivis Say, Transylvania Jl. IV, 1831, p. 527; * Am. Conch., Ill, 1832, pi. 

 XXXV.—* Conrad, New F. W. Shells, 1834, p. 68.— *Ferussac, Guer. Mag., 



1835, p. 26.—* Deshayes, An. sans. Vert., 2d ed., VI, 1835, p. 556; 3d ed., II, 

 1839, p. 675.—* Hanley, Test. Moll., 1842, p. 200; * Biv. Shells, 1843, p. 200, 

 pi. XXIII, fig. 50.—* Chenu, Bib. Conch., 1st ser.. Ill, 1845, p. 46, pi. xiii, figs. 

 1, la, 16.—* Catlow and Reeve, Conch. Nom., 1845, p. 58.—* Kuster, 

 Conch. Cab. Unio, 1852, p. 60, pi. xiv, fig. 1.—* Conrad, Pr. Ac. N. Sci. 



1 This name had been used by Sowerby for a fossil Unio, and Conrad subsequently 

 changed it to porrectus on that account, but Sowerby had also used that name for a 

 Unio. 



