774 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tQUADRULA METANEVRA Rafinesque. 



* Obliquaria (Quadrula) metanevra Rafinesque, Anu. Gen. Sci. Brux., V, 1820, p. 



305, p]. Lxxxi, figs. 15, 16.'— «Chenu, Bib. Conch., 1st ser., Ill, 1845, p. 18, 

 pi. II, figs. 15, 16. 



* Unio {Theliderma) metanevra Swainson, Treat, on Mai., 1840, p. 268, figs. 50, 54&. 

 *Unio metanever Short and P^^aton, Transylvania Jl., 1831, p. 76. — * Conrad, 



New F. W. Shells, 1834, p. 70.— *Hanley, Test. Moll., 1842, p. 179; *Biv. 

 Shells, 1843, p. 179, pi. xxi, fig. 31.— * Conrad, Pr. Ac. N. Sci. Phila., VI, 

 1853, p. 252.— *Eeeve, Conch. Icon., XVI, 1864, pi. VII, fig. 25.— *PiETEL, 

 Conch. Sam., Ill, 1890, p. 159. 



* Margarita {Unio) metanever Lea, Syu., 1836, p. 15; 1838, p. 15. 



*Unio metanevrus Say, Am. Couch., VI, 1834. — *Ferussac, Guer. Mag., 1835, p. 



27.— * Conrad, Monog., I, 1835, p. 10, pi. v, fig. 2.— *H. and A. Adams, Gen. 



Eec. Moll., II, 1857, p. 497.— * Calkins, Pr. Ottawa Ac. N. Sci., 1874, p. 43.— 



■" B. H. Wright, Check List, 1888.— Call, Tr. Acad. N. Sci. St. Louis, VII, 

 1895, p. 28, pi. X. 

 * Margaron {Unio) metanevrus Lea, Syn., 1852, p. 22; 1870, p. 33. 

 *■ Unio metaniver Catlow and Reeve, Conch. Nom., 1845, p. 61. 

 "Unio metaneurus Kuster, Conch. Cab. Unio, 1852, p. 50, pi. x, fig. 4. — *P^tel, 



Conch. Sam., Ill, 1890, p. 159. 

 *fUnio nodosiis Barnes, Am. Jl. Sci. VI, 1823, p. 124, pi. vi, figs. 7, 7a, Ib.^—* HiL- 



DRETH, Am. Jl. Sci., XIV, 1828, p. 281.— *Chenu, Manual, 1859, II, p. 138, 



fig. 663. 

 *Mya nodosa Eaton, Zool. Test-Book, 1826, p. 216. 



t QUADRULA METANEVRA var. WARDII Lea. 



*Unio wardii Lea, Pr. Ac. N. Sci. Phila., V, 1861, p, 392; * Jl. Ac. N. Sci. Phila., 

 V, 1862, p. 187, pi. XXIV, fig. 257; *Obs., IX, 1863, p. 9, pi. xxiv, fig. 257.— 

 *Sowerby, Conch. Icon., XVI, 1868, pi. Lxxxii, fig. 434.— *B. H. Wright, 

 Check List, 1888.— * PiETEL, Conch. Sam., Ill, 1890, p. 172. 



*Margaron { Unio) ivardii Lea, Syn., 1870, p. 33. 



Mississippi drainage area except its southern portion, extending to 

 the Tennessee and Arkansas rivers. 



t QUADRULA TUBEROSA Lea. 



* Unio tuherosus Lea, Pr. Am. Phil. Soc, I, 1840, p. 286 ; * Tr. Am. Phil. Soc, VIII, 



1842, p. 210, pLxiv, fig. 25; *Obs.,III, 1842, p. 48, pi. xiv, fig. 25.— * Conrad, 

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

 II, 1857, p. 497.— *Chenu, 111. Conch., 1858, pi. xxviii, figs. 7, 7a, 7&.— *B. H. 

 Wright, Check List, 1888.—* P^etel, Conch. Sam., Ill, 1890, p. 170. 

 ""Margaron Unio tuherosus Lea, Syn., 1852, p. 22; 1870, p. 33. 



Cumberland and Tennessee river systems. 



' By common consent this species — which is a most striking one — has been allowed 

 to stand to the credit of Rafinesque. The outlines of the figures bear some resem- 

 blance to the species. 



2 It is hard to tell from these figures just what Barnes had before him when he 

 described this species. They are as much like metanevra as anything. 



