770 PIiOCEEl>/\<:* or THE NATIONAL MUSEUM. VOL.XXII. 



Mississippi basin generally; St. Lawrence drainage; Red River of 

 theNorth; Lake Winnipeg; Alabama River system; southwest to west- 

 ern Texas, the varieties in the southwestern area. 



QUADRULA DIGITATA Morelet. 



* Unio digitatus MORELKT, Test. Noviss., Ft. 2, 1851, p. 24.* B. H. WRIGHT, Check 



List, 1888. * FISCHER and CKOSSK, Miss. Sci., Pt. 7, II, 1894, p. 563, pi. LX, 

 fig. I- 

 Rio Usuinacinta, Guatemala. 



j QUADRULA TRIUMPHANS B. H. Wright. 



*Unio triumpliaiis B. H. WRIGHT, Nautilus, XI, 1898, p. 101. 



*Qiiadmla Iriumplians SIMPSON, Pr. Ac. N. Sci. Phila., 1900, p. 83, pi. in, fig 3. 



Coosa River, St. Clair County, Alabama. 



f QUADRULA BOYKINIANA Lea. 



*Unio boykinianus LEA, Pr. Am. Phil. Soc., I, 1840, p. 288; *Tr. Am. Phil. Soc., 

 VIII, 1812; p. 208, pi. xui, fig. 22; * Obs., Ill, 1842, p. 46, pi. xm, fig. 22. 

 *H. and A. ADAMS, Gen. Kec. Moll., II, 1857, p. 498.* CHENU, 111. Conch., 

 1858, pi. xxvn, figs. 2, 2a, 2b.* KUSTER, Conch. Cab., 1861, p. 181, pi. LVII, 

 fig. 1. *SOWERBY, Conch. Icon., XVI, 1868, pi. i, fig. 1. *B. H. WRIGHT, 

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



*Mar(jaron ( Unio) boykinianus LEA, Syn., 1852, p. 19; 1870, p. 28. 



*Plectomen<s boyJcinianus CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 260. 



*Unio baykinianus P/ETEL, Conch. Sam., Ill, 1890, p. 145. 



Chattahoochee River system; Claiborne, Alabama; Pine Barren 

 Creek, Escambia County, Florida. 



t QUADRULA HEROS Say.' 



Unio heros SAY, New Harm. Bias., 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. xxn, fig. 28. *B. H. 

 WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 155. 



* Unio lieros var. muUiplicatus PJETEL, Conch. Sam., Ill, 1890, p. 155. 



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



t * Unio mullipncatns 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. 

 Rec. Moll., II, 1857, p. 498.* CHENU, 111. Conch., 1858, pi. ix, figs. 2, 2a, 21-, 

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

 p. 43.* B. H. WRIGHT, Check List, 1888. 



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

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

 which he called Unio lieros, but did not figure it. Later in the American Conchology 

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

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

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

 described Say's species as Unio mnltipHcatus. 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. 



