742 PBOCEEDjy&S OF'THS NATIONAL MrxKUM. VOL.XXII. 



* Unio (ledivis (.'<>M:.\I>, Mouog., V. IXii!. p. 15, }>]. xxm, fig. 1. 



M Unio'ineptus LEA. Tr. Am. Phil. Soe.,X, 1*52, p.L'tM. ..'. \v. fig. 12; * Qbs.. V, 

 ]>52, p. 17. pi. xv, fig. 12. M'ONHAD. I'r. Ar:nl. X. Sci. Phila.. VI. 1853, p. 

 250. "H. and A. ADAMS. Gen. Rec. Moll.. II, 1857, p. 494. * B. H. WRIGHT, 

 Check List. 1888. T.KTEL. Conch. Sam. .III. J90 p. 1",. 

 Murgnron filial inejilux LEA. Syu.. lS52.p. lil ; 187i>. p. 50. 



*t Unio hcbes LEA, Tr. Am. Phil. Soc.. X, 1852, p. 267, pi. xvm, fig. 21 ; *Obs., V, 

 1852, p. 23, pi. xvm, fig. 21. * CONRAD, Pr. A . V Sci. Phila., VI, 185:;, p. 

 250. 'H. and A. ADAMS, Gen. Rec. Moil. ,11, 1857, p. 494. *B. H. WRIGHT, 

 Check List. 1S8X. ^ P.KTEL, Conch. 8am., Ill, 1890. p. 151. 

 Mnrgaion . I'nio hebes LEA, Syn.. 1852. p. 2b: 1870. p. 51. 

 I'nio nrularis COXRAD. Pr. Ac. X. Sci. Phila., VI, 1853, p. 257. * CONRAD, Jl. 



Ac. N. Sci. Phila., 1*54, p. L'96. 

 *t / 'nio cicur LEA. Pr. Ac. N. Sci. Phila.. V. 1861, p. 39; Ml. Ac. N. Sci. Phila., 



V, 1862, p. 93, pi. xm, fig. 241. Obs., VIII, 1862, p. 96, pi. xin, fig. 241. 

 B. H. WRIGHT, Check List, 1888. 



* Margaron ( Uio cicur LEA, Syu., 1870, p. 52. 



l'n'\n xi/Hulidus LKA. ( part Pr. Ac. X. Sci. Phila., XV. 1863, p. 192. * Jl. Ac. N. 

 Sci. Phila., VI, 1866. p. 22. pi. vn, fig. 20; *Obs., XI, 1867, p. 26, pi. vn, fig. 

 20. ^B. H. WRIGHT. Check List, 1888. 



* Afargaron ( I'nio) squalidus LEA, Syn., 1870, p. 51. 



* t rniojewettii LEA, Pr. Ac. N. Sci. Phila., XI, 1867, p. 81 ; * Jl. Ac, N. Sci. Phila., 



VI, 1868, p. 276. pi. xxxvn, fig. 89; *Obs., XII, 1869, p, 36, pi. xxvn, fig. 89. 



* B. H. W RIGHT, Check List, 1888. 



* Margaron ( Uiiio i jewettii LEA, Syu.. 1870, p. 51. 



* U'nio paicensis LEA, J Pr. Ac. X. Sci. Phila.. XII, 1868, p. 161; * Jl. Ac. N. Sci 



Phila.. VI, 1868.p. 302, pi. xi.v. fig. 114 ; Obs., XII, 1869, p. 62, pi. XLV, fig. 

 114.* B. H. WRIGHT, Check List, 1888. 



* Margaron ( Unin txi ><'<' HI n LEA, Syn., 1870, p. 51. 



*iUnio rivicoliis COXRAD, Am. Jl. Conch., IV, 1868, p. 280, pi. xvm, fig. 4. 

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



MUNIO OBESUS var. BLANDINGIANUS Lea. 



Unio Wandingianus LEA, Tr. Am. Phil. Soc., V, 1834, p, 101, pi. xv, fig. 44; 3 

 *Obs., I, 1834, p. 213, pi. xv, fig. 44. * FERUSSAC, Guer. Mag., 1835, p. 29. 



* CONRAD. Monog., V, 1836, p. 46. pi. xxm, fig. 2.* HANLEY, Test. Moll., 1842, 

 p. 200 : * Biv . shells, 1843. p. 200, pi. xxn, fig. 1. * CATLOW aud REEVE, Conch. 

 Norn., 1845, p. 56. Ki STER, Couch. Cab. Unio, 1852, p. 36, pi. vi, fig. 2. 



* COXRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 245. * H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p. 492. * SOWKRBY, Couch. Icon., XVI, 186<>, pi. xxxv, 

 fig. 187.* B. H. WRIGHT, Check List. 1888." S. H. WRIGHT, Conch. Ex., II, 

 1888, p. 95. * P.KTKL, Conch. Sam., Ill, 1890, p. 146. 



* Margarita (Unio) IJandiiigianns LEA, Syn., 1836, p. 32: 1838, p. 22. 



* Margaron (Tnio) l>ltidingianua LEA, Syn., 1852, p. 33; 1870. p. 54. 



"Under this name Dr. Lea has certainly described t\v> species, a heavy quadrate. 

 form biangnlate behind, with purple uacre a variety of complanatiis aud another 

 which is, no doubt, U. obesus, aud is the shell figured. 



-A rough, apparently diseased obcsits. 



"A decidedly trapezoidal form with cloth-like, dark epidermis, possibly worthy of 

 a varietal name. The transition to the typical state is, however, very complete. 



