NO.IL"'.-,. SYNOPSIS (>!' THE NAIADESSIMPSON. 527 



* Lampailia ventricosa STIMI-SOX, Shells of N. Eng., 1851, p. 14. 



* A 'it io radiatus HILUHKTH, Am. Jl. Sci., XIV, 1828, p. 286. 



Cnio occidcns LEA, Tr. Am. Phil. Soc., Ill, 1829, p. 435, pi. x, iig. 16. SHORT and 

 EATON, Transylvania Jl., 1831. p. 78.* LEA, Obs., 1, 1834, p. 49, pi. x, fig. 16. 

 * HANLEY, Test. Moll., 1842, p. 189 ; * Biv. Shells, 1843, p. 189.* CATLOW aud 

 REEVE. Conch. Norn., 1845, p. 62. * KUSTER, Conch. Cab. Unio, 1856, p. 170, 

 p!. LI, figs. 1,2. *CHENU, 111. Conch., 1858, pi. xn, figs. 5, 5a, 5ft. *H. and 

 A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. * CALKINS, Pr. Ottawa A< ad. Sci., 

 1874, p. 44. *LATCHFORD, Tr. Ottawa Field. Nat. Club, 1882, p. 51. * 13. H. 

 WRIGHT, Check List, 1888. 



* Mariiarlia ( Unio) occidens LEA, Syn., 1836, p. 23; 1838, p. 18. 



* Margaron (Unio) Occident LEA, Syn., 1852, p. 26; 1870, p.41. 1 



* I'nio sttboratns LEA, Tr. Am. Phil. Soc., IV, 1831. p. 118, pi. xviij, fig. 46; 2 



' Obs., 1, 1834, p. 128, pi. xvm, fig. 46. *HANLEY, Test, Moll., 1842, p. 184; 

 *Biv. Shells, 1843, p. 184, pi. xxn, fig. 43. * CATLOW and REEVE, Couch. 

 Norn., 1845, p. 64. - OHENU, 111. Conch., 1858, pi. xn, figs. 6, 6a, 60. *H. 

 and A. ADAMS, Gen. Rcc. Moll., II, 1857, p. 496. *SOWKRBY, Conch. Icon., 

 XVI, 1866, pi. xxxi, fig. 163; 1868, pi. LXXXV, iig. 456. *B. H. WEIGHT, 

 Check List, 1888. * P.-KTEL, Conch. Sara., Ill, 1890, p. 168. 



* Margarita ( Unio) aiibocatua LEA, Syn., 1836, p. 19; 1838, p. 17. 



* Margaron ( Univ')8uboratua LEA, Syn., 1852, p. 24; 1870, p. 37. 



* rnio cardium CONRAD, New F. W. Shells, 1834, p. 68. 3 SAY. Am. Conch., VI, 



1834. CONRAD, Pr. Ac.N. Sci. Phila., VI, 1853, p.246. KUSTER, Conch. Cab. 

 Unio, 1856, p. 169, pi. L, figs. 1-4. 



* Unio cardium Raf. v. occidens P.ETEL, Conch. Sam., Ill, 1890, p. 174. 



* f'nio cardium Raf. v. rentricosus P.ETEL, Conch. Sam., Ill, 1890, p. 147. 

 f Utiiofasciohts, FEKCSSAC, Guer. Mag. 1835, p. 26. 



* Unio orata, DESHAYES, An. sans. Vert., 3d ed. 1839, p. 669. 



* Uuio oraius KUSTER, Couch. Cab. Unio, 1852, p. 55, pi. xn, fig. 1. 

 ^Unio lenis CONRAD, Monog., XII, 1840, p. 106, pi. LVIII, fig. 2. 4 



* I'nio canadensis LEA, Proc. Acad. N. Sci. Phila., I, 1857, p. 85; * Jl. Ac. Nat. Sci. 



Phila., IV, 1860, p. 268, pi. XLIV, fig. 148 ; * Obs., VII, 1860, p. 86, pi. XLI v, fig. 

 148. B. H. WRIGHT, Check List, 1888. 



* Hargaron ( Unio) canadensis LEA, Syn., 1870, p. 37. 



* rnio dolabra'formis SOWERBY, Conch. Icon., XVI, 1867, pi. LIX, p. 298. 



* Unio latissimm SOWERBY ?, Conch. Icon., XVI, 1868, pi. LXVI, fig. 337. 



fLAMPSILIS VENTRICOSUS var. SATUR Lea. 



* Unio salur LEA, Pr. Am. Phil. Soc.,V., 1852, p. 252; e Tr. Am. Phil. Soc., X, 1852, 



p. 205, pi. xvii, fig. 19 ; *Obs., V, 1852, p. 21, pi. x vn, fig. 19. *CONRAI>, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 257. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, 



1 Lea says this is so close to U. ventricosus that it would be well to unite them. 

 Foot note in Synopsis, 1870, p. 41. 



2 This is, I am .sure, a fine male U. rentricosiis Barnes. Dr. Lea is inclined to this 

 opinion iu a footnote on p. 118 of the Transactions. 



: Conrad refers this species to Rafinesque. From the latter author's figure and 

 description of Lampailia cardium it is evident that it is a member of the ventricosus 

 group, but whether it is the U. rentricosus of Barnes, the U. capax of Green, or some 

 other species, I am unable to determine. Conrad and some other authors believe it to 

 be Barnes's species. 



The type in the Philadelphia Academy is a young U. ventricosus. 



6 The type is a diseased individual, and is probably a compressed male rentricosua. 



6 1 believe this to be merely a rather delicate, dark-colored variety of ventricosus, 

 which inhabits the southwestern part of the Mississippi drainage. 



