780 PROCEEDINGS OF THE NATIONAL MUSEUM. 



-* Call (part), Tr. Ac. N. Sci. St. Louis, VII, 1895, p. 40, pis. xii, xiii, 

 XIV, XV, figs. 1, 2. 



^Margarita ( Unio) dorfeuillianus Lea, Syn., 1838, p. 15. 



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



*fUnio uher Conrad, Am. Jl. Conch., II, 1866, p. 279, pL xv, fig. 16.' 



\*Unio schooler af ten sis Lea, Tr. Am. PhiL Soc, V, 1834, p. 37, pL in, fig. 9;^ *0b8., 

 I, 1834, p. 149, pi. Ill, fig. 9.— *Ferussac, Guer. Mag., 1835, p. 29.— *Hanley, 

 Test. Moll., 1842, p. 178; *Biv. Shells, 1843, p. 178.— -^Catlow and Reeve, 

 Conch. Nom., 1845, p. 63.— 'H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 497.— 

 '^SoWERBY, Couch. Icon., XVI, 1868, pi. i, fig. 3; xiii, fig. 47. 



*Mar;/arita (Unio) sehoolcraftensis Lea, Syn., 1836, p. 15; 1833, p. 15. 



*Marrjaron (Unio) sehoolcraftensis Lea, Syu., 1852, p. 22. 



* Unio bullatus var. sehoolcraftensis PyETp:L, Conch. Sam., Ill, 1890, p. 146. 

 * Margaron ( Unio) sehoolcraftit Lea, Syn., 1870, p. 33. 



* Unio schoolcrafiii, B. H. Wright, Check List, 1888. 



tQUADRULA PUSTULOSA var. PERNODOSA Lea. 



*Unio pernodosus Lea, Pr. Am. Phil. Soc, IV, 1845, p. 163; *Tr. Am. Phil. Soc, 

 X, '1848, p. 71, pi. Ill, fig. 8; *Obs., IV, 1848, p. 45, pi. in, fig. 8.—* Conrad, 

 Pr. Ac.N. Sci. Phila., VI, 1853, p. 2.54.— * Reeve, Conch. Icon., XVI, 1864, pi. 

 XII, fig. 46.— *B. H. WriCxHT, Check List, 1888.— *P.etel, Conch. Sam., Ill, 

 1890, p. 163. 



^Margaron ( Unio) pernodosus Lea, Syn., 1870, p. 34. 



t* Unio asperatus Lea,^ Pr. Ac. N. Sci. Phila., V, 1861, p. 41 ; * Jl. Ac. N. Sci. Phila., 

 V, 1862, p. 68, pi. VII, fig. 218; "Obs., VIII, 1862, p. 72, pi. vii, fig. 218.— 

 *SowERBY, Conch. Icon., XVI, 1868, pi. lxxxv, fig. 450. — *B. H. Wright, 

 Check List, 1888.— *P^tel, Conch. Sam., Ill, 1890, p. 145. 



*Margaron ( Unio) asperatus Lea, Syn., 1870, p. 33. 



tQUADRULA PUSTULOSA var. KEINERIANA Lea. 



*Unio keinerianus Lea, Pr. Am. Phil. Soc, V, 1852, p. 251; *Tr. Am. Phil. Soc, 

 X, 1852, p. 281, pi. xxni, fig. 40; ^*Obs., V, 1852, p. 37, pi. xxiii, fig. 40.— 

 * Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 251.— *H. and A. Adams, Gen. 

 Rec. Moll., II, 1857, p. 496.— *B. H. Wright, Check List, 1888.— * P^tel, 

 Conch. Sam., IH, 1890, p. 156. 



*Margaron (Unio (keifterianus Lea, Syn., 1852, p. 22; 1870, p. 34. 



Entire Mississippi drainage; Michigan; Lake Erie;"? Alabama River 

 system; westward to central Texas; the varieties in streams draining 

 into the Gulf of Mexico. 



' Probably a smootli form of j^ustulosits. 



^The type is a nearly smooth, compressed form of pustiilosus, I am sure. Lea 

 includes with it in his collection a number of strongly pustulous, compressed shells. 

 Quadrula pustiilosa is a very widespread, abundant, and variable species. A large, 

 solid, inflated, and somewhat quadrate form has been called Unio dorfeuillianus by 

 Dr. Lea, and various smooth races have received names, but they so completely 

 blend into the typical form that it does not seem to me they are worthy of varietal 

 names. A somewhat triangular variety, often haviug a broad, faint ray, is found iu 

 the Ohio River and southward which probably equals the Ynxiety pernodosa. 



^ Seems to be about the same as U. pernodosHS, only a little smoother. These two 

 are more rounded posteriorly, and are doubtfully worthy of a varietal name. 



