520 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tTRUNCILLA SULCATA Lea. 



* Unio snlcafus Lea, Tr. Am. Phil. Soc, III, 1830, p, 430, pi. viii, fig. 2.— *Say, 



Am, Conch., No. 1, 1830, jjl. v. — Short and Eaton, Transylvania JL, 1831, 

 p. 75.— *Lea Obs., I, 1834, p. 44, pi. viii, fig. 12.— *Hanley, Test. Moll., 1842, 

 p. 188; *Biv. Shells, 1843, p. 188.— *Chenu> Bib. Conch., 1st ser., Ill, 1845, p. 



II, pi. I, figs. 5, 5«.— *Catlow and Reeve, Conch. Nom., 1845, p. 64.— *Chenu, 



III. Conch., 18.58, pi. xiii, figs. 3, 3a, 3?>.— "H. and A. Adams, Gen. Rec. Moll., 

 II, 1857, p. 496.— *Reeve, Conch. Icon., XVI, 1864, pi. xiv, fig. 60.— *P.etel, 

 Conch. Sam., Ill, 1890, p. 169. 



* Margarita (_Unio) sidcatus Lea, Syn., 1836, p. 22; 1838, p. 18. 

 *Margaron (Unio) sidcatus Lea, Syn., 1852, p. 26; 1870, j). 40. 



*Unio sulcata Desha yes. An. sans Vert, 2d ed., VI, 1835, p. 548; 3d ed., II, 1839, 

 p. 672. 



Unio ridiiundus Say, New Harm. Diss., II, 1829, p. 308; "Am. Conch., I, 1830, pi. 

 V. — Short and Eaton, Transylvania JL, 1831, p. 75. — "Conrad, New 

 F. W. Shells, 1834, p. 71.— "Chenu, Bib. Conch., 1st ser., Ill, 1845, p. 11, pi. i, 

 fig. 6.— *Kuster, Conch. Cab. Unio, 1862, p. 276, pi. xciii, fig. 2.— *Reeve, 

 Conch. Icon., XVI, 1864, pi xv, fig. 63. 



■* Unio obliquatus Say, Am. Conch., VI, 1834. — *Conrad, New F. W. Shells, 1834, p. 

 70. — *Kuster, Conch. Cab., 1862, p. 274, pi. xcii, fig. 3. — *Agassiz, Arch, fiir 

 Naturg., I, 1852, p. 43.— * Conrad, Pr. Ac. N, Sci. Phila., VI, 1853, p. 253. 



^Unio gihhosus var. jyerobliquus Conrad, Mouog., VI, 1836, p. 50, pi. xxvii, fig. 2. 



Unio perohliquus Conrad, Cover of Monog., VIII, 1837. 



""Unio pectitus Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 255; Jl. Ac. N. Sci. 

 Phila., 1854, p. 297, pi. xxvii, fig. 4. 



TRUNCILLA SULCATA var. DELICATA Simpson.' 



OLio River drainage; the variety in the Detroit River and southern 

 Michigan. 



(Group of Truncilla liaysiana.) 



Shell shining, round-oval; posterior part of both male and female 

 distinctly radially sculptured. 



tTRUNCILLA HAYSIANA Lea. 



* Unio haijsianus Lea, Tr. Am. Phil. Soc, V, 1833, p. 35, pi. in, fig. 7 ; *Obs., I, 1834, 



p. 147, pi. Ill, fig. 7.— ^Hanley, Test. Moll., 1842, p. 188; *Biv. Shells, 1843, p. 

 188. — *Catlow and Reeve, Conch. Nom., 1845, p. 59. — *Conrad, Pr. Ac. N. 

 Sci. Phila., VI, 1853, p. 250.— *Kuster, Conch. Cab. Unio, 1856, p. 209, pi. lxix, 

 fig. 4. — *H. and A. Adams, Gen. Rec. Moll., II, 18.57, p. 495. — *Reeve, Conch. 

 Icon., XVI, 1864, pi. xv, fig. 62.— *P/ETEL, Conch. Sam., Ill, 1890, p. 154. 



* Margarita ( Unio) haysianus Lea, Syn. 1836, p. 22; 1838, p. 18. 

 *Margaron ( Unio) haysianus Lea, Syn. 1852, p. 26; 1870, p. 41. 

 '^ ScaJenaria liaysiana Agassiz, Arch, fiir Naturg. I, 1852, p. 48. 



" Unio sowerhyanus Lea, Tr. Am. Phil. Soc, V, 1839, p. 68, pi. x, fig. 28 ;2 * Obs. I, 

 1834, p. 180, pi. X, fig. 28.— ^Ferussac, Guer. Mag., 1835, p..29.— * Conkad, 



iMr. Bryant Walker has sent me specimens of a form which I refer to this speciea 

 that are smaller and in every way more delicate. I propose the above varietal 

 name for it. 



"Male of T. liaysiana. Unio haysianus and U. sowerhyanus were published in the 

 same paper, the former having precedence. 



