782 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



*Umo (Theliderma) jnistulata Swainson, Treat, on Mai., 1840, p. 271, fig. 5id. 



*Umo nodulatus Say, Am. Couch., VI, 1834. — "" Conrad, New F. W. Shells, 1834, 

 p_ 70.— * Ferussac, Guer. Mag., 1835, p. 28.— * Conrad, Monog., 1837, p. 80, 

 pi. XLV, fig. 1. — * KusTER, Conch. Cab., 1861, p. 254, pi. lxxxvi, fig. 1. — 

 * Keeve, Conch. Icon., XVI, 1864, pi. xiii, fig. 51. 



* Unio nodulatus Rafinesque var. pustulatus P/ETEL, Conch. Sam., Ill, 1890, p. 161. 



Ohio, Cumberland, and Tennessee river systems; Mississippi River 

 and tributaries from eastern Iowa south to Louisiana; southern 

 Michigan. 



tQUADRULA NODIFERA Conrad.i 



* Unio nodiferus Conrad, Pr.Ac. N. Sci. Phila., 1, 1841, p. 19 ; * Jl. Ac. N. Sci. Phila., 



VIII, 1842, p. 179; I, 1850, p. 277, pi. xxxviii, figs. 4, 8; *Pr. Ac. N. Sci. 

 Phila., VI, 1853, p. 253. 



Louisiana and eastern Texas. 



t QUADRULA CAHABENSIS Lea. 



*Umo cahabensis 'L-EA, Pr.Ac.N. Sci. Phila., XXIIl, 1871, p. 190; "^ Jl. Ac. N. Sci. 

 Phila., VIII, 1874, p. 17, pi. v, fig. 14; * Ohs., XIII, 1874, p. 21, pi. v, fig. 14.— 

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



Oahawba Eiver, Alabama. 



t QUADRULA VALLATA Lea. 



* Unio vallatus Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 145 ; *" Jl. Ac. N. Sci. Phila., 



1869, p. 315, pi. I., fig. 128; * Obs., XII, 1869, p. 75, pi. L, fig. 128.-* B. H. 

 Wright, Check List, 1888. 

 ""Margaron (Unio) raUatns Lea, Syn., 1870, p. 34. 

 Alabama and Black Warrior rivers, Alabama. 



tQUADRULA REFULGENS Lea. 



* Unio refiiloenft Lea, Pr. Ac. N. Sci. Phila., Xll, 1868, p. 145 ; -^ Jl. Ac. N. Sci. Phila., 



VI, 1869, p. 317, pi. LI, fig. 130; * Obs., XII, 1869, p. 77, pi. li, fig. 130.—* B. H. 

 Wright, Check List, 1888. 

 ""Margaron ( Unio) refulgens Lea, Syn., 1870, p. 34. 



* Unio pusiulosus Call (part), Tr. Ac. Sci. St. Louis, VII, 1895, p. 42, pi. xv, figs. 3, 4. 



Mississippi and probably Alabama. 



tQUADRULA HOUSTONENSIS Lea. 



*Unio honstonensis Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 155; *.n. Ac. N. Sci. 

 Phila., IV, 1860, p. 358, pi. lx, fig. 183; ^ Obs., VIII, p. 40, pL lx, fig. 183.— 

 *SowERBY, Couch. Icon., XVI, 1868, pi. lxxxi, fig. 425.— *B. H.Wright, 

 Check List, 1888. 



* Margaron (Unio) houstonensis Lea, Syn., 1870, p. 55. 



Texas, Louisiana, and southern Arkansas, Verdigris River, Kansas? 



1 There are six shells bearing the name Unio nodiferus Conrad in the Philadelphia 

 Academy of Natural Sciences. Part of them ure the same as figured in the Journal, 

 and the rest are jirobably mortoni. 



