544 i'H<>< !:/; in \<;s or THE \.ITIO\AL MUSEUM. [VOL.XXH. 



fLAMPSILIS ANODONTOIDES var. FLORIDENSIS Lea. 



/ >iio Jlorulaixis LEA,' Tr. Am. Phil. Soc., X, 1852, p. 274, pi. xxi, fig. 31 ; s Obs., 

 V, 1852, p. 30, pi. xxi, fig. 31. * COXRAD, Pr. Ac. N. Sci., Phila., VI, 1?C>:5, 

 p. 249. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 492. * B. H. 

 WRIGHT, Check List. 1888.' P.^TEL, Conch. Sain., Ill, 1890, p. 152. 

 *Margaron (Unio) floridensis LEA, Syn., 1852, p. 39; 1870, p. 62. 



Entire Mississippi River drainage except (probably) tbe upper Mis- 

 souri. All tbe Gulf drainage from tbe \VithIacoochee Kiver, Florida, 

 to tbe Bio Grande, and into Mexico. 



fLAMPSILIS FALLACIOSUS (Smith) Simpson. 2 



*Unio anodontoides REEVE, Conch. Icon., XVI, 1865, pi. xxi, iig. 97. v CALKINS, 



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

 *LampsiUs anodontoides BAKKR, Moll. Chicago, Pt. 1, 1898, pi. x, Hg. 3. :i 



* Unio oriens SOWERBY, Conch. Icon., 1868, pi. LXIII, fig. 314. 



* Lampsilis fallaciosits SMITH, Bull. U. S. Fish Com., 1899, p. 291, pi. LXXIX. 



" SIMPSON, Pr. Ac. N. Sci., Phila., 1900, p. 74, pi. n, fig. 5. 



Upper Mississippi drainage; south to tbe Cumberland River, Ten 

 nessee, and to Arkansas; Red Kiver of tbe North? 



f LAMPSILIS 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 ( Unio) virescens LEA, Syn., 1870, p. 42. 



Tennessee Kiver in northern Alabama. 



tLAMPSILIS AUSTRALIS Simpson. 



* Lampsilis australis SIMPSON, 5 Pr. Ac. N. Sci., Phila., 1900, p. 75, pi. n, fig. 2. 



Little Patsaliga Creek, southeastern Alabama. 



t LAMPSILIS RECTUS Lamarck. 



* Unio recta LAMARCK, An. sans Vert., VI, 1819, p. 74. * VALENCIENNES, Rec. Obs. 



Zool., II, 1833, p. 234, pi. LIV, fig. 1.* DESHAYES, An. sans Vert., 2<l ed., VII, 

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



1 Lampsilis anodontoides becomes thinner and more delicate in the waters of the 

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

 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. U. S. Fish 

 Commission, but not described. 



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

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

 have referred to. 



*A species which scorns to combine some of the characters of L. anodontoides and 

 cariosiiH, but which probably should c placed here. 



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

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

 from the latter, though specimens of 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. 



