778 FBOCEEDINGS OF THE NATIONAL MUSEUM. vol. xxii. 



* Unio tracjosus Hanley, Test. Moll., 1842, p. 178; *Biv. Shells, 1843, p. 178, pi. xx, 



fig. 40.' — " Catlow and Reeve, Conch. Nom., 1845, p. 64. 

 Ohio, Cumberland, and Tennessee river systems ; westward probably 

 to Minnesota, Nebraska, and Kansas. 



t QUADRULA FORSHEYI Lea. 



* Unio forslieyi Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 155; * Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 357, pi. LX, fig. 182; *Obs.,VIII, 1860, p. 39, pi. lx, fig. 182.— 



* Eeeve, Conch. Icon., XVI, 1864, pi. vi, fig. 21 .— * B. H.Wright, Check List, 

 1888.— *P.ETEL, Conch. Sam., Ill, 1890, p. 153. 



* Margaron ( Unio) forslieyi Lea, Syn., 1870, p. 32. 



Alabama to Texas, in streams flowing into the Gulf of Mexico. 



t QUADRULA SPECIOSA Lea. 



* Unio speciosus Lea, Pr. Ac. N. Sci. Phila., VI, 1862, p. 168 ; ^ Jl. Ac. N. Sci. Phila., 



V, 1862, p. 207, pi. XXXI, fig. 276; * Obs., IX, 1863, p. 29, pi. xxxi, fig. 276.— 

 *SowERBY, Conch. Icon., XVI, 1868, pi. Lxxxiv, fig. 447.— * B. H.Wright, 

 Check List, 1888.— * PiETEL, Conch. Sam., Ill, 1890, p. 168. 



* Margaron ( Unio) si^eciosus Lea, Syn., 1870, p. 33. 



Kansas, south to Texas. 



t QUADRULA APICULATA Say. 



* Unio apicidatus Say, New Harm. Diss., II, No. 2, 1829, p. 309; * Am. Conch., VI, 



1834, pi. LII.2— * Conrad, New F. W. Shells, 1834, p. 67.—* Ferussac, Guer. 

 Mag., 1835, p. 27.—* Conrad, Monog., IX, 1837, p. 78, pi. xliv, fig. 1.—* Han- 

 ley, Test. Moll., 1842, p. 178; * Biv. Shells, 1843, p. 178, pi. xxiii, fig. 51.— 

 *(3atlow and Reeve, Conch. Nom., 1845, p. 55. — * Conrad, Pr. Ac. N. Sci, 

 Phila., VI, 1853, p. 245.— * PI. and A. Adams, Gen. Eec. Moll., II, 1857, p. 497.— 



* Chenu, Manual, 1859, II, p. 142, fig. 696.— * Reeve, Conch. Icon., XVI, 1864, 

 pi. Ill, fig. 11.— "B. H. Wright, Check List, 1888.— *P.etel, Conch. Sam., Ill, 

 1890, p. 144. 



* Margarita ( Unio) apiculatus Lea, Syn., 1836, p. 15; 1838, p. 15. 



* Margaron (Unio) apiculatus Lea, Syn., 1852, p. 22; 1870, p. 33. 



* Unio nobilis CoNRAD (part), Jl. Ac. N. Sci. Phila., 1854, p. 297, pi. xxvii, figs. 2, 3.^ 



Louisiana to Texas. 



t QUADRULA RUMPHIANA Lea. 



* Unio rumpUanus Lea, Tr. Am. Phil. Soc, X, 1852, p. 276, pi. xxii, fig. 34; Obs., 



V, 1852, p. 32, pi. XXII, fig. 34.— * Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 

 257.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 497.— B. H.Wright, 

 Check List, 1888.—* P.etel, Conch. Sam., Ill, 1890, p. 166. 



* Margaron ( Unio) rumphianus Lea, Syn., 1852, p. 21 ; 1870, p. 33. 



i*Unio hlandianiis Lea,* Pr. Ac. N. Sci. Phila., VIII, 1856, p. 263; * Jl. Ac. N. Sci. 



' Written tragosus in text, no doubt a typographical error, as it is written cor- 

 rectly in the explanation of the j)late. 



2 Say says that U. asper Lea is the same as his apiculatus. I think he is wrong. 



■'One specimen figured (fig. 2) is Q. apiculata. The other (fig. 3) is a nondescript, 

 possibly Q. asper, or it may be the form of Q. laclirymosus which I have placed under 

 var. lunulatus Pratt. 



* Certain forms of rnmpliianus are very different from Mandianus, being more 

 inflated, and showing a high, biangulate posterior ridge and a deep radial sinus in 

 front of it, while specimens of the latter are much less inflated and have a low, some- 

 what rounded, posterior ridge. But the difterence between the two seems to be 

 absolutely briged by intermediate specimens. 



