No.i^us. SYNOPSIS OF THi: NAIADJl:S—SIMFSO^\ 553 



tLAMPSILIS FATUUS Lea.i 



* Unio fatuiis Lea, 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, pi. xi, fig. 14.— *CoNRAr), Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 249.— *H. and A. Adams, Gen. Eec. Moll., 11, 1857, 

 p. 491.—* Chenu, 111. Conch., 1858, pi. xxxi, figs. 4, 4a, 4?;.—'' 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. 



* Cnio 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, tig. 7.—* Conrad, Pr. 

 Ac. N. Sci. Phila., VI, 1853, p. 248.—* Chenu, 111. Conch., 1858, pi. xxx, figs. 

 5, 5«, 5&. — * H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 491.—* B. H.Wright, 

 Check List, 1888. 

 ^ Margaron {Unio) dactylua Lea, Syn., 1852, p. 36; 1870, p. 57. 



Tennessee Eiver system. One shell from Beaver Eiver, Pennsyl- 

 vania seems to be this. 



LAMPSILIS PLANICOSTATUS Lea. 



Unio ijlaniGostatus 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. 



* Mar gar on (Unio) planicostaUis Lea, Syn., 1870, p. 43. 



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

 Alabama. 



tLAMPSILIS NEBULOSUS Conrad.- 



* Unionebulosns Conrad, New F.W. Shells, 1834, p. 28, pi. in, fig.7; p. 70. — *Ferus- 



SAC, Gaer. Mag., 1835, p. 29.— *Moller, 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. AVright, Check List, 1888.— *P.etel, 

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



* Margarita Unio) cumierlandiamis Liea, Syn. ,1836, -p. 27 ; 1838, p. 20. 



* Margaron ( Unio) cumherlandianus Lea, Syn., 1852, p. 30. 



t*^ Unio cumherlandicus'L^A, Tr. Am. Phil. Soc, VI, 1838, p. 25, pi. vii, fig. 19; *Obs., 

 II, 1838, p. 25, pi. VII, fig. 19.—* Troschel, Arch, fiir Naturg., V, 1839, Pt. 2, p. 

 235.—* Hanley, Test. Moll., 1842,p. 191 ; * Biv. Shells, 1843, p. 195, pi. xxii, fig. 

 59. — * Catlow and Reeve, Couch. Nom., 1845, p. 58. — *Conrad, Pr. Ac. N. 



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

 it has a rather more cylindi'ical shell, less rayed, and more decidedly and suddenly 

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



^After carefully comijaring 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 he 

 found in the Ohio Eiver 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 different 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 tho general manifestation of the males of 

 this species. 



