552 I'HiH'KKinxr.s or Tin: \.rno.\.ii. 



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

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

 below; nacre bluish, becoming beautifully iridescent posteriorly. 

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

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

 papillae below the marsupium ; marsupium having a strong, deep sulcus 

 parallel with and near to the.basr. 



tLAMPSILIS IRIS Lea. 



* TnioimLEA, Tr. Am. Phil. Soc., Ill, 1830, p. 439. pi. ix, lig. 18; *Obs., I, 1831. p. 53, 



pi. xi, fig. 18. *CONRAD, New F. W. Shells, 1834, p. 69. *FERUSSAC, (iuer. 



Mag., 1835, p. 26. *DESHAYES. An. sausVert, 2ded.,VI, 1835, p. 550; 3d. ed., II, 



1839, p. 673. *HANLEY, Test. Moll. 1842, p. 206; *Biv. Shells, 1843, p. 206, pi. 



xxi, fig. 37. *CATLOW and REEVE, Conch. Nom., 1845, p. 60. *H.and A. 



Ai)AMS,Gen. Rec. Moll., II, 1857, p. 491. *CHENU, 111. Conch., 1858, pi. via, figs. 



7, la, 11. *RKEVE, 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.' 

 *Lamp8ili8 iris BAKER, Moll. Chicago, Pt. 1, 1X98, p. 105, pi. xm, fig. 1; xiv, 



fig. 2. 



* Unio creperus 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 Natnrg., V, 1839, Pt. 2, p. 235. *CoN- 

 RAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 247. "Cmsxr, 111. Couch., 1858, pi. 

 xxin, figs. 5, 5a, 56. *H. and A. ADAMS. (Jon. Rec. Moll., II, 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. *CATI,OW and REEVE, Conch. 



Icon., 1845, p. 58. 



t * Fnio novi-eboraci LEA, Tr. Am. Phil. Soc., VI, 1838, p. 104, pi. xxiv, fig. 114; 

 *Obs., II, 1838, p. 104, pi. xxiv, fig. 114. *TROSCHET,, Arch, fur 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. "CATLOW and REEVE, 

 Conch. Nom, 1845, p. 61. *H. aud A. ADAMS, Gen. Rec. Moll., II, 1857, p. 491. 

 *CHENU, 111. Conch., 1858, pi. xix, figs. 5, 5a, 56. *KI T STER, Conch. Cab. Unio. 

 1861, p. 221, pi. LXXIV, fig. 4. *SOWBHBY, Conch. Icon., XVI, 1866, pi. xxxvm, 

 fig. 206. *CALKINS, Pr. Ottawa Ac. Sci. 1874, p. 43. *B. H. WKKSHT, Check 

 List, 1888. TJETEL, Conch. Sam. Ill, 1890, p. 161. 

 Margarita ( Unio) novi-eboraci LEA Syn., 1838, p. 19. 



*Margaron ( Unio) novl-eboraci LEA, Syu., 1852, p. 27; 1870, p. 60. 



* Unio radiatus DE KAY, Zool. of N. Y., Pt. 5, 1843, p. 189, pi. x vn, fig. 2:i(i. 



* Unio stibrostratus KUSTER, Conch. Cab. Unio. 1861, p. 203, pi. LXVII, fig. 3. 



*RF.EVE, Conch. Icou., XVI, 1864, pi. xvn, fig. 78. 



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

 tem; Illinois and Wisconsin. 2 



1 Dr. Lea states in the Synopsis in the above reference that Say's ('. xubrostratus is 

 identical with his iris. He is certainly mistaken. 



-Lea places Unio opalinus Anthony (Am. .11. Conch. II, 1866, p. 146, pl.vn, 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. 



