770 PBOCEEBINGS OF THE NATIONAL MUSEUM. vol.xxii. 



Mississippi basin generally; St. Lawrence drainage; Eed Eiver of 

 the North; Lake Winnipeg; Alabama Eiver system; southwest to west- 

 ern Texas, the varieties in the southwestern area. 



QUADRULA DIGITATA Morelet. 



* Unio digitatus Morelet, Test. Noviss., Pt. 2, 1851, p. 24. — * B. H. Wright, Check 



List, 1888.— * Fischer and Crosse, Miss, Sci., Pt. 7, II, 1894, p. 563, pi. lx, 

 fig. 1. 



Eio Usumaciuta, Guatemala. 



t QUADRULA TRIUMPHANS B. H. Wright. 



* Unio iriumplians B. H. Wright, Nautilus, XI, 1898, p. 101. 



""Quadrula triumphans Simpson, Pr. Ac. N. Sci. Phila., 1900, p. 83, pi. iii, fig 3. 



Coosa Eiver, St. Clair County, Alabama. 



t QUADRULA BOYKINIANA Lea. 



*Unio boyUnianus Lea, Pr. Am. Phil. Soc, I, 1840, p. 288; * Tr. Am. Phil. Soc, 

 VIII, 1812, p. 208, pi. XIII, fig. 22; * Ohs., Ill, 1842, p. 46, pi. xiii, fig, 22.— 

 *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 498.—* Chenu, 111. Conch., 

 1858, pi. xx^aI, figs. 2, 2a, 2&.— * Kuster, Conch. Cab., 1861, p. 181, pi. lvii, 

 fig. 1.—* Sowerby, Conch. Icon., XVI, 1868, pi. i, fig. 1.— *B. H. Weight, 

 Check List, 1888.—* P.etel, Conch. Sam., Ill, 1890, p. 146. 



*Margaron {Unio) Jjoylcinianus Lea, Syn., 1852, p. 19; 1870, p. 28. 



" Plectomeriis hoyUnianus Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 260. 



*Unio iaylcinianus PyETEL, Conch. Sam., Ill, 1890, p. 145. 



Chattahoochee Eiver system; Claiborne, Alabama; Pine Barren 

 Creek, Escambia County, Florida. 



t QUADRULA HEROS Say.' 



Unio heros Say, New Harm. Diss., II, No. 19, 1829, p. 291; *Am. Conch., VI, 

 1834, (part).— 'Conrad, New F. W. Shells, 1834, p. 69— * Ferussac, Guer. 

 Mag., 1835, p. 27.— * Conrad, Monog., XII, 1840, p. 107, pi. lix.— * Hanley, 

 Test. Moll., 1842, p. 175; * Biv. Shells, 1843, p. 175, pi. xxii, fig. 28.— *B. H. 

 Wright, Check List, 1888.— * P^etel, Conch. Sam., Ill, 1890, p. 155. 



* Unio lieros var. multipUcatus PyETEL, Conch. Sam., Ill, 1890, p. 155. 



* Unio undulatus Say, Am. Conch., I, 1831, pi. xvi (April). 



t * Unio muliiplicatus Lea, Tr. Am. Phil. Soc, IV, 1831, p. 70, pi, iv, fig. 2 (latter 

 part of the year); * Obs,, I, 1834, p. 80, pi, iv, fig. 2, — *Potiez and Mi- 

 CHAUD, Gall. Moll., 1844, p. 155, pi. Lix, fig. 1. — * H. and A. Adams, Gen. 

 Eec. Moll., II, 1857, p. 498.—* Chenu, 111. Couch., 1858, pi. ix, figs. 2, 2a, 2h; 

 * Manual, 1859, II, p. 143, fig. 703.—* Calkins, Pr. Ottawa Acad. Sci., 1874, 

 p. 43. — * B. H. Wright, Check List, 



1 There hag been some dispute as to what name should be applied to the above 

 species. In 1829 Say fully described iu the New Harmony Disseminator a species 

 which he called Unio heros, but diduotfigure it. Later in the American Conchology 

 ho placed it in the synonymy of Unio undulatus Barnes, though the figure which he 

 gives as imdulatus in that work and to which his description refers is plainly not 

 Barnes's species, but the lieros described in the Disseminator. In 1831 Dr. Lea 

 described Say's species as Unio multipUcatus. Notwithstanding the fact that Say 

 placed his own species in the synonymy, it is perfectly distinct and was properly 

 characterized in his description, and his name will have to take the place of the bet- 

 ter known one of Dr. Lea. 



