544 PBOCEEDINGS OF THE NATIONAL MUSEUM. [vol.xxii. 



tLAMPSILIS ANODONTOIDES var. FLORIDENSIS Lea. 



* Unio floridensis Lea,' Tr. Am. Phil. Soc, X, 1852, p. 274, pi. xxi, fig. 31 ; " Obs., 



V, 1852, p. 30, pi. XXI, fig. 31.— "-Conrad, Pr. Ac. N. Sci., Phila., VI, 1853, 

 p. 249.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 492.— ^^ B. H. 

 Wkight, Check List, 1888.— "^ PiEXEL, Conch. Sam., Ill, 1890, p. 152. 

 "Margaron (Unio) floridensis Lea, Syn., 1852, p. 39; 1870, p. 62. 



Entire Mississippi Eiver drainage except (probably) the upper Mis- 

 souri. All the Gulf drainage from the Withlacoochee Kiver, Florida, 

 to the -Rio Grande, and into Mexico. 



fLAMPSILIS FALLACIOSUS (Smith) Simpson.^ 



*Unio anodonloides Eeeve, Conch. Icon., XVI, 1865, pi. xxi, fig. 97.— "" Calkins, 



Pr, Ottawa Acad., 1874, p. 41. 

 "Lampsilis anodontoides Baker, Moll. Chicago, Pt. 1, 1898, pi. x, fig. 3.-' 



* Unio oriens Sowerby, Conch. Icon., 1868, pi. lxiii, fig. 314. 



* Lampsilis fallaciosus Smith, Bull. U. S. Fish Com., 1899, p. 291, pi. lxxix.— 



* Simpson, Pr. Ac. N. Sci., Phila., 1900, p. 74, pi. ii, fig. 5. 



Upper Mississippi drainage; south to the Cumberland Eiver, Ten 

 nessee, and to Arkansas; Red River of , the North*? 



fLAMPSILIS VIRESCENS Lea.^ 



* Unio virescens Lea, Pr. Ac. N. Sci., Phila., II, 1858, p. 40 ; * Jl. Ac. N. Sci., Phila., 



IV, 1860, p. 341, pi. LV, fig. 166 ; '^ Obs., VIII, 1860, p. 23, pi. Lv, fig. 166.—* B. 

 H. Wright, Check List, 1888. 



* Margaron ( Unto) virescens Lea, Syn., 1870, p. 42. 



Tennessee River in northern Alabama. 



fLAMPSILIS AUSTRALIS Simpson. 



* Lampsilis australis Simpson,^ Pr. Ac. N. Sci., Phila., 1900, p. 75, pi. ii, fig. 2. 



Little Patsaliga Creek, southeastern Alabama. 



t LAMPSILIS RECTUS Lamarck. 



* Unio recta Lamarck, An. sans Veit., VI, 1819, p. 74.—* Valenciennes, Rec. Obs. 



Zool., II, 1833, p. 234, pi. liv, fig. 1.—* Desha yes, An. sans Vert., 2(1 ed., VII, 

 1835, p. 537 ; 3d ed., II, 1839, p. 669. 



' Lampsilis anodonioides becomes thinner and more delicate in the waters of the 

 eastern Gulf drainage, and in Florida assumes the form called by Lea Unio floridensis. 

 The type of the latter is not in the Lea collection. 



2 Figured and the name (supplied by the writer) given by Smith in Bull. IT. S. Fish 

 Commission, but not described. 



3As this species has generally been confounded with the very closely allied X. ano- 

 dontoides of Lea, it is a little difficult to be certain in all cases which form authors 

 have referred to. 



^A species which seems to combine some of the characters of L. anodontoides and 

 cariosus, but which probably should o placed here. 



'" This species seems to stand partly between L. rectus and L. anodontoides. In the 

 character of color both of nacre and epidermis the former is quite widely separated 

 from the latter, though specimens oi rectus from Michigan and other northern local- 

 ities sometimes have a tawny epidermis. In L. australis the nacre is silvery, and 

 the color of the epidermis approaches to some extent that of anodontoides. 



