NO. 1200. SYNOPSIS OF TUT. XAIADES SIMPSON. 555 



tLAMPSILIS FATUUS Lea. 1 



* Unio fatu us LKA, Pr. Am. Phil. Soc., 1,1840, p. 287; *Tr. Am. Phil. Soc.,VIII, 1842, 



p. 201, pi. xi, fig. 14; *Obs., Ill, 1842, p. 39, pl.xi, fig. 14. *CONRAD,Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 249.* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, 

 p. 491.* CHENU, 111. Conch., 1858, pi. xxxi, figs. 4, 4a, 47>. * KUSTER, Conch. 

 Cab. Unio, 1862, p. 287, pi. xcvi, fig. 5.* B. H. WRIGHT, Check List, 1888. 

 * P.ETEL, Conch. Sam., Ill, 1890, p. 152. ' 



* Margaron ( Unio) fatuus LEA, Syn., 1852, p. 38; 1870, p. 61. 



* i'nio dactylus LEA, Pr. Am. Phil. Soc., I, 1840, p. 287; *Tr. Am. Phil. Soc., VIII, 



1842, p. 196, pi. ix. fig. 7; * Obs., Ill, 1842, p. 34, pi. ix, fig. 7.* COXRAD, Pr. 

 Ac.N. Sci. Phila., VI, 1853, p. 248. * CHENU, 111. Conch., 1858, pi. xxx, tigs. 

 5, 5, 56. * H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 491. * B. H. WRIGHT, 

 Check List, 1888. 



* Margaron (Unio) dactylus LKA, Syn., 1852, p. 36; 1870, p. 57. 



Tennessee Kiver system. One shell from Beaver River, Pennsyl- 

 vania seems to be this. 



LAMPSILIS PLANICOSTATUS Lea. 



rnio planlcoatatus LEA, Pr. Ac. N. Sci. Phila., IV, 1860, p. 92; *J1. Ac. N. Sci. 

 Phila., IV, 1860, p. 354, pi. LIX, fig. 179; *Obs., VIII, 1860, p. 36, pi. LIX, fig. 

 179._* B. H. WRIGHT, Check List, 1888. 



* Margaron (Unio) planicostalus LEA, Syn., 1870, p. 43. 



Warren County, Kentucky; Clinch River, Tennessee; Tuscumbia, 

 Alabama. 



tLAMPSILIS NEBULOSUS Conrad.- 



* Unionebulosus CONRAD, New F. W. Shells, 1834, p. 28, pi. in, fig.7; p.70. * FERUS- 



SAC, Guer. Mag., 1835, p. 29. *MtfLLER, Syn. Nov. Gen., 1836, p. 202. 

 *CHENU, Bib. Conch., 1st. ser., Ill, 1845, p. 16, pi. i, fig. 4.* CONRAD, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 252. * B. H. WRIGHT, Check List, 1888. *P.ETEL, 

 Conch. Sam., Ill, 1890, p. 160. 



* Margarita Unio) cumberlandianux LEA, Syu., 1836, p. 27; 1838, p. 20. 

 *" Margaron ( Unio) cicmberlandianm LEA, Syn., 1852, p. 30. 



t* Unio cumberlandicusiiEA, Tr. Am. Phil. Soc., VI, 1838, p. 25, pi. vn, fig. 19; *Obs., 

 II, 1838, p. 25, pi. vii, fig. 19.* TROSCHEL, Arch, fur Naturg., V, 1839, Pt. 2, p. 

 235.* HANLEY, Test. Moll., 1842,p. 191 ; * Biv. Shells, 1843, p. 195, pi. xxn, fig. 

 59. * CATLOW and REEVE, Conch. Nom., 1845, p. 58. *CONRAD, Pr. Ac. N. 



'It is doubtful whether this is more than a variety of the preceding. In general, 

 it has a rather more cylindrical shell, less rayed, and more decidedly and suddenly 

 thickened in trout than iris, but there are intermediate forms. 



'-After carefully comparing again and again large series of specimens, I confess 

 that I can not possibly separate the large number of so-called species I have united 

 under this, the oldest name. It may seem a little strange that a species should be 

 found in the Ohio River area and Gulf drainage, but recent research has proven 

 that a large number of our common Upper Mississippi Valley and Ohio River forms 

 are found in the Coosa, Alabama, Black Warrior, and adjoining streams. There is 

 some variation in the brightness of the painting of a number of these so-called 

 species, and in the form of diiferent specimens, but no more than is found in many 

 other abundant, widely-distributed forms, and the figure on pi. in of the New 

 Fresh-water Shells fairly well represents tlio general manifestation of the males of 

 this species. 



