NO. 1205. sr.vo/'.s/x or mi: NAIADES SIMTSOX. 523 



" Margaron (Unio) perplej-ns LEA, Syn.. 1S.V2, p. 23; 1870, p. 34. 

 " fiiio yibboaus FERUSSAI , Gner. Mag., 1835, p. 27. CONRAD, Mouog. VI, 1836, p. 

 50, pi. xxvn, fig.l. REEVE, Conch. Icon., XVI, 1864. pi. xi, fig.'41, 41, 416. 

 hysnomla yibbosa AGASSIZ, Arch, fiir Nat., I, 1852, -p. 43. 

 *Unio yibbosus, liaf. r. perplex us P.ETEL, Conch. Sam., Ill, 1890, p. 153. 



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



Phila,, VI, 1853, p. 259. 



* Unio obliqiiHs POTIEZ and MICHAUD, Gall. Moll., 1844, p. 153, pi. LVIII, figs. 3, 4. 



tTRUNCILLA PERPLEXA var. RANGIANA Lea. 



*Unio ranyianus LEA, Trans. Am. Phil. Soc., VI, 1839, p. 95, pi. xvm, fig. 56; 1 

 * Obs., II, 1838, p. 95, pi. xvm, fig. 56.* TROSCHKL, Arch, fur Naturg.,V, 1839, 

 p. 237. *HANLEY, Test. Moll., 1842, p. 187; * Biv. Shells, 1843, p. 187, pi. xxi, 

 rig. 48. "CATLOW and REEVE, Conch. Noin., 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. Couch., 1858, pi. xxiv, figs. 5, oa, 5b. KUSTKH, Couch. 

 Cab. Unio, 1861, p. 257, p). LXXXVII, fig. 1; LXXXIX, fig. 1.* REEVE, Conch. 

 Icon., XVI, 1864, pi. xiv, fig. 54. * P/ETEL, Conch. Sam., Ill, 1890, p. 164. 



* Maryarita ( Unio) ranyianus LEA, Syn., 1838, p. 18. 



* JIaryaron ( 1'nio) ranyianus LEA, Syn., 1852, p. 26; 1870. p. 40. 



* Unio gitbernacHlum REEVE, Couch. Icon., XVI, 1865, pi. xxvm, tig. 146. P.ETEL, 



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



tTRUNCILLA PERPLEXA var. CINCINNATIENSIS Lea. 



cinciniiatientis LEA, Proc. Am. Phil. Soc., I, 1840, p. 285; *Tr. Am. Phil. 

 Soc., VIII, 1842, p. 194, pi. vin, fig. 4; *Obs., Ill, 1842, p. 32, pi. vin, fig. 4. 

 * CONRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 246. * H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p.497. * CHENU., Ill.Conch., 1858, pi. xxx, figs. 3, 3a, 36. 

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

 *Margaron (I'nio) cincinnatiensia LEA, Syn., 1852, p. 22; 1870, p. 33. 



fiiio phiUipxii REEVK, Conch. Icon., XVI, 1864, pi. iv, fig. 15. 



Oliio Kiver drainage; southern Michigan? The variety ranyianus 

 to south Michiyau. 



tTRUNCILLA SAMPSONII Lea. 



- I'nio sampsoiiii LEA, Pr. Ac. N. Sci. Phila., VI, 1861, p. 392; *J1. Ac. N. Sci. 



1'hila., V, 1862, p. 192, pi. xxv, tig. 261; *Obs., IX, 1863, p. 14, pi. xxv, fig. 

 261; Syu., 1870, p. 40. 



Wabash Eiver; Tennessee? 



tTRUNCILLA PROPINQUA Lea. 



* Unio propinquus LEA, Pr. Ac. N. Sci. Phila., I, 1857. p. 83 ; Ml. Ac. N. Sci. Phila., 



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

 EKBY, Couch. Icon., XVI, 1868, pi. LXXIX, fig. 417. *P.-ETEL, Couch. Sam., 

 Ill, 1890, p. 164. 



* Manjaron ( Unio.) propinquus LEA, Syn., 1870, p. 34. 



Tennessee and Cumberland river drainage. 



1 Dr. Lea claims that the animal o. K this form is lighter colored than that of per- 

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

 the White Mouth. The shells srein to absolutely blend together, and I have 

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



