NO. 1205. SYNOPSIS OF THE NJIJDES—SDJFSON. 523 



' Margaron {Unio) per plexus Lea, Syn., 1852, p. 23; 1870, p. 31. 



" Unio gibbosus Ferussac, Guer. Mag., 1835, p. 27. — Conrad, Monog. VI, 1836, p. 



50, pi. XXVII, fig.l.— Reeve, Conch. Icon., XVI, 1864, pi. xi, tig. 11, 41a, 41&. 

 ^Bysnomia gibbosa AOtASSiz, Arch, fiir Nat., I, 1852, p. 43. 

 *Unio gibbosus, Eaf. r. perplexus P^.tel, Conch. Sam., Ill, 1890, p. 153. 

 *Unio torulosiis Conkad, New F. W. Shells, 1834, p. 72; * Proc. Acad, N. Sci. 



Phila., VI, 1853, p. 259. - 

 *Unio obliqnus Potiez and Michacd, Gall. Moll., 1844, p. 153, pi. lviii, figs. 3, 4. 



tTRUNCILLA PERPLEXA var. RANGIANA Lea. 



^Unio rangianus Lea, Trans. Am. Phil. Soc, VI, 1839, p. 95, pi. xviir, fig. 56 ;i 

 * Obs., II, 1838, p. 95, pi. xviii, fig. 56.—* Troschel, Arch, flir Naturg., V, 1839, 

 p. 237.—* Hanley, Test. -Moll., 1842, p. 187 ; * Biv. Shells, 1843, p. 187, pi. xxi, 

 fig. 48. — - Catlow and Reeve, Conch. Nom., 1845, p. 63. — * Conrad, Pr. Ac. 

 Nat. Sci. Phila., VI, 1853, p. 256.—* H. and A. Adams, Gen. Rec. Moll., II, 1857, 

 p. 495. — * Chenu., 111. Conch., 1858, pi. xxxv, figs. 5, 5a, bb. — * Kuster, Conch. 

 Cab. Unio, 1861, p. 257, pi. lxxxvii, fig. 1; lxxxix, fig. 1.—* Reeve, Conch. 

 Icon., XVI, 1864, pi. xiv, fig. 54.— '^P.etel, Conch. Sam., Ill, 1890, p. 164. 



* Margarita {Unio} rangianus Lea, Sj'ii., 1838, p. 18. 



* Margaron ( Unio) rangianus Lea, Syn., 1852, p. 26; 1870, jj. 40. 



* Unio gnbernaculum Reeve, Conch. Icon., XVI, 1865, pi. xxviii, fig. 146. — P.etel, 



Conch. Sam., Ill, 1890, p. 154. 



tTRUNCILLA PERPLEXA var. CINCINNATIENSIS Lea. 



""Unio cincinnatiensis Lea, Proc. Am. Phil. Soc, I, 1840, p. 285; *Tr. Am. Phil. 

 Soc, VIII, 1842, p. 194,pl. viii, fig. 4; * Obs., Ill, 1842, p. 32, pi. viii, fig. 4.— 

 *CoxRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 246. — *H. and A. Adams, Gen, 

 Rec. Moll., II, 1857, p. 497. — * Chenu., Ill.Coucb,, 1858, pl.xxx, figs. 3, 3a, 3b. — 

 *P.ETEL. Conch. Sam., Ill, 1890, p. 148. 



*Margaron (Unio) cincinnatiensis Lea, Syn., 1852, p. 22; 1870, p. 33. 



*Unio pMUipsii Reeve, Couch. Icon., XVI, 1864, pi. iv, fig. 15. 



Ohio Eiver drainage; southeru Michigan f The variety rrtrtr/Zanws 

 to south Michigan. 



tTRUNCILLA SAMPSONII Lea. 



"-Vnio sampsonii Lea, Pr. Ac N. Sci. Phila., VI, 1861, p. 392; *J1. Ac N. Sci. 

 Phila., V, 1862, p. 192, pi. xxv, fig. 261; *Obs., IX, 1863, p. 14, pi. xxv, fig. 

 261; Syn., 1870, p. 40. 



Wabash Eiver; Tennessee'? 



tTRUNCILLA PROPINQUA Lea. 



* Unio propinquus Lea, Pr. Ac. N. Sci. Phila., I, 1857, p. 83; *J1. Ac. N. Sci. Phila., 



V, 1862, p. 63, pi. V, fig. 212; 'Obs., VIII, 1862, p. 67, pi. v, fig. 212.—* Sow- 

 ERBY, Conch. Icon., XVI, 1868, pi. Lxxix, fig. 417. — *P/ETEL, Conch. Sam., 

 Ill, 1890, p. 164. 

 "^Margaron {Unio.) propinquus Lea, Syn., 1870, p. .34. 



Tennessee and Cumberland river drainage. 



' Dr. Lea claims that the animal o.^' this form is lighter colored than that oi per- 

 plexus, and quotes Mr. Clark, of Cincinnati, who states that this is known there as 

 the White Mouth. The shells S('em to absolutely biend together, and I have 

 observed a wide range of color in the auimals of a number of species of the genus. 



