NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 527 



* Lampsilis ventricosa Stimpson, Shells of N. Eng., 1851, p. 14. 



* Unto radiatus Hildiietii, Am. Jl. Sci., XIV, 1828, p. 286. 



Unto occidens Lea, Tr. Am. Phil. Soc, III, 1829, p. 435, pi. s, fig. 16. — Short and 



Eaton, Transylvania JL, 1831, p. 78. — * Lea, Obs., 1, 1834, p. 49, pi. x, fig. 16. 



* Haxley, Test. Moll., 1842, p. 189 ; * Biv. Shells, 1843, p. 189.—* Catlow and 

 Reeve, Couch. Nom., 1845, p. 62. — *Kuster, Conch. Cab. Unio, 1856, p. 170, 

 pi. LI, figs. 1, 2.— *Chenu, 111. Conch., 1858, pi. xii, figs. 5, 5o, 5&.— *H. and 

 A. Adams, Gen. Rec. Moll., II, 1857, p. 494. — * Calkins, Pr. Ottawa Acad. Sci., 

 1874, p. 44.— *Latchford, Tr. Ottawa Field. Nat. Club, 1882, p. 51.—" B. H, 

 Wright, Check List, 1888. 



* Margarita (Unio) occidens Lea, Syn., 1836, p. 23; 1838, p. 18. 



* Margaron (Unio) occidens Lea, Syn., 1852, p. 26; 1870, p. 41.i 



* Unio suboratus Lea, Tr. Am. Phil. Soc, IV, 1831, p. 118, pi. xviii, fig. 46 ;2 



*■ Obs., 1, 1834, p. 128, pi. xviii, fig. 46.— *Hanley, Test. Moll., 1842, p. 184; 

 *Biv. Shells, 1843, p. 184, pi. xxii, fig. 43.— "Catlow and Ree-n^e, Conch. 

 Nom., 1845, p.'64.— ' Chenu, 111. Conch., 1858, pi. xii, figs. 6, 6a, 6&.— *H. 

 and A. Adams, Gen. Rec. Moll., II, 1857, p. 496.— "Sowerby, Conch. Icon., 

 XVI, 1866, pi. XXXI, fig. 163; 1868, pi. lxxxv, fig. 456.— *B. H. Weight, 

 Check List, 1888.— * P^etel, Conch. Sam., Ill, 1890, p. 168. 



* Margarita ( Unio) suhovatus Lea, Syn., 1836, p. 19; 1838, p. 17. 



* Margaron ( Unio')suhovatus Lea, Syn., 1852, p. 24; 1870, p. 37. 



* Unio cardium Conrad, New F. W. Shells, 1834, p. 68.3— Say. ^q^_ 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. 



* Unio cardium Raf. v. ventricosiis P.etel, Conch. Sam., Ill, 1890, p. 147. 

 " Unio fasciolus, Ferussac, Guer. Mag. 1835, p. 26. 



* Unio ovata, Deshayes, An. sans. Vert., 3d ed. 1839, p. 669. 



* Unio ovaliis Kusteh, Conch. Cab. Unio, 1852, p. 55, pi. xii, fig. 1. 

 *Unio lenis Conrad, Monog., XII, 1840, p. 106, pi. lviii, fig. 2.^ 



* Unio 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. xliv, fig. 



148.— B. H. Wright, Check List, 1888. 

 ^Margaron ( Unio) canadensis Lea, Syn., 1870, ]>. 37. 

 "^Unio dolabra'formis Sowerby, Couch. Icon., XVI^ 1867, pi. lix, p. 298. 

 *Unio latissimus Sowerby?, Conch. Icon., XVI, 1868, pi. lxyi, fig. 337. 



fLAMPSILIS VENTRICOSUS var. SATUR Lea. 



* Unio satur Lea, Pr. Am. Phil. Soc, V., 1852, p. 252 ; s Tr. Am. Phil. Soc, X, 1852, 



p. 205, pi. XVII, fig. 19 ; *Obs., V, 1852, p. 21, pi. xvii, fig. 19.— ^Conrad, Pr. Ac. 

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



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

 Foot note in Synopsis, 1870, p. 41. 



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

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



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

 description of LampsiUs cardium it is evident that it is a member of the ventricosiis 

 group, but whether it is the U. ventricosus of Barnes, the Z7. 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. ventricosiis. 



^ The type is a diseased individual, and is probably a compressed male ventricosus. 



" I believe this to be merely a rather delicate, dark-colored variety of ventricosus, 

 which inhabits the southwestern part of the Mississippi drainage. 



