552 PROCEEDINGS OF THE NATIONAL MUSEUM. 



ture consisting of irregular ridges and corrugations that liave a ten- 

 dency to fall into two loops, wliich are sometimes slightly nodulous 

 below; nacre bluish, becoming beautifully iridesceut posteriorly. 

 Animal having the inner branchisB free or united to the abdominal sac; 

 mantle border often maculated and generally, in the female, having 

 papilla) below the marsupium ; marsupium having a strong, deep sulcus 

 parallel with and near to the base. 



tLAMPSILIS IRIS Lea. 



* Fwioim Lka, Tr. Am. Phil. Soc, III, 1830, p. 439, pi. ix, fig. 18; *Obs., 1, 1834, p. 53, 



pi. XI, fig. 18.— ^Conrad, New F. W. Shells, 1834, p. 69. — 'Ferussac, Guer. 



Mag., 1835, p. 26.— *Deshayes. An. sansVert, 2ded.,VI, 1835, p. 550; 3(i. ed., II, 



1839, p. 673.— *Hanley, Test. Moll. 1842, p. 206; ^Biv. Shells, 1843, p. 206, pi. 



XXI, fig. 37. — *Catlow and Reeve, Conch. Norn., 1845, p. 60.— *H. and A. 



Adams, Gen. Eec. Moll., II, 1857, p. 491.— *Chenu, Ill.Conch., 1858, pl.viii, figs. 



7, la, 7Z). — *Reeve, Conch. Icon., XVI, 1865, pi. xxix, fig. 148. — ^Calkins. Pr. 



Ottawa Ac. Sci., 1874, p. 42.— *B. H. Wright, Check List, 1888. 

 ^Margarita ( Unio) iris Lea, Syn., 1836, p. 37 ; 1838, p. 25. 

 *Margaron ( Unio) iris Lea, Syn., 1852, p. 38 ; 1870, p. 60.' 

 *Lampsilis iris Baker, Moll. Chicago, Pt. 1, 1898, p. 105, pi. xiii, fig. 1; xiv, 



fig. 2. 



* Unio cre])erus Lea, Tr. Am. Phil. Soc, VI, 1838, p. 33, pi. x, fig. 28 ; *Obs., II, 1838, p, 



33, pi. x, fig. 28.— ^Troschel, Arch, fiir Naturg., V, 1839, Pt. 2, p. 235.— *CoN- 

 RAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 247.— *Chenu, 111. Couch., 1858, pi. 

 xxiii, figs. 5, 5a, 5&.— *H. and A. Adams, Gen. Rec. Moll., 11, 1857, p. 493. — 

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



"^ Margarita ( Unio) creperus Lea, Syn. 1836, p. 28; 1838, p. 20. 



* Margaron ( Unio) creperus Lea, Syn. 1852, p. 31; 1870, p. 48. 



""Unio cresserus Hanley, Test. Moll., 1842, p. 196. — *Catlow and Reeve, Conch. 

 Icon., 1845, p. 58. 



\ ^ Unio novi-eioraci 'Lf.a, Tr. Am. Phil. Soc, VI, 1838, p. 104, pi. xxiv, fig. 114; 

 *Obs.,II,1838,p. 104, pi. XXIV, fig.114.— *Troschel, Arch, fiir Naturg., V, 1839, 

 Pt. 2, p. 237.— *Hanley, Test. Moll., 1842, p. 190; *Biv. Shells, 1843, p. 190.— 

 *De Kay, Zool. of N. Y., Pt. 5, 1843, pi. xx, fig. 240.— *Catloav and Reeve, 

 Conch. Nom, 1845, p. 61.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 491.— 

 *Chenu, 111. Conch., 1858, pi. xix, figs. 5, 5a, 56.— "Kuster, Conch. Cab. Unio. 

 1861, p. 221, pi. Lxxiv, fig. 4.— 'SowERBY, Conch. Icon., XVI, 1866, pi. xxxviii, 

 fig. 206.— -^Calkins, Pr. Ottawa Ac. Sci. 1874, p. 43.— *B. H. Wright, Check 

 List, 1888.— *Pjetel, Conch. Sam. Ill, 1890, p. 161. 



^Margarita ( Unio) novi-ehoraci Lea Syn., 1838, p. 19. 



'^Margaron ( Unio) novi-eboraci Lea, Syn., 1852, p. 27; 1870, p. 60. 



* Unio radiat'us De Kay-, Zool. of N. Y., Pt. 5, 1843, p. 189, pi. x vii, fig. 236. 



* Unio siihrostratus Kuster, Conch. Cab. Unio. 1861, p. 203, pi. lxvii, fig. 3. — 



*Reeve, Conch. Icon., XVI, 1864, pi. xvii, fig. 78. 



St. Lawrence drainage; west to southern Michigan; Ohio liiver sys- 

 tem; Illinois and Wisconsin.^ 



1 Dr. Lea states in the Synopsis in the above reference that Say's U. subrostratus is 

 identical with his iris. He is certainly mistaken. 



2 Lea places Unio opalinus knXihonj (Am. Jl. Conch. II, 1866, p. 146, pl.vii, fig. 2) in the 

 synonymy of the above species. It is an oval, compressed, greenish-yellow shell 

 according to the figure and description, and seems to have been injured anteriorly. 

 I can not tell what it is. It is credited by Anthony to Michigan. 



