740 PROCEEDINGS OF TTIK \ATIOXAL MUSEUM. 



"Margarita (Unio) tetralasmus LEA, Syn., 1836, p. 30; 1838, p. 21. 

 ' Murgarcn ( Unio) tetralasmiis LEA, Syu., 1852, p. 32; 1870, p. 50. 



* Unio excultus CONRAD, Monog., XI, 1838, p. 99, pi. LIV, fig. 1; Pr. Ac. N. Sci. 



Philsi., VI, 1853, p. 249.* PJETEL, Conch. Sam., Ill, 1890, p. 152. 



* \tlnio jHirallelus CONRAD, Pr. Ac. N. Sci. Phila., I, 1841, p. 20; * Jl. Ac. Phila., 



VIII, 1842, p. 179. ' 



* t I'nio symmetric!!? LEA, Pr. Am. Phil. Soc., IV, 1845, p. 164; * Tr. Am. Phil. Soc., 



X, 1853, p. 73, pi. iv, fig. 11; *Obs., 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., II, 

 1857, p. 493.* B. H. WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 

 1890, p. 169. 



* Hargaron ( Unio) symmetric^ LEA, Syn., 1852, p. 32; 1870, p. 52. 



* t Umoporrectus CONRAD, Jl. Ac. N. Sci. Phila., 1854, p. 296, pi. xxvi, fig. 7.* B. H. 



WRIGHT, Check List, 1888. 



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



* Unio jamesianm LEA, Pr. Ac. N. Sci. Phila., I, 1857, p. 84 ; *J1. Ac. N. Sci. Phila., 



IV, 1-'5S, p. 53, pi. vi, fig. 35; *Obs., VI, 1858, p. 52, pi. vi, fig. 35. *B.H. 

 WRIGHT, Check List, 1888. 

 Hargaron ( Unio) jamesianus LEA, Syn., 1870, p. 50. 



fUNIO TETRALASMUS var. CAMPTODON Say. 



* Unio camptodon SAY, Am. Conch., V, 1832, pi. xni. * 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, 2b. *CATLOW and REEVE, 

 Couch. Norn., 1845, p. 56. x 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;ETEL, 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. 



* Hargaron ( 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 Conch., 



1862, p. 218. * B. H. WRIGHT, Check List, 1888. * FISCHER and CROSSE, 

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



* Margaron ( Unio) manulnus GOULD, Syn., 1870, p. 54. 



* Unio manubrius P/ETEL, 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. xxni, fig. 50." CHENU, Bib. Conch., 1st ser., Ill, 1845, p. 46, pi. xm, 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. 



