NO. 1205. SYNOPSIS OF THE XAl J DES— SIMPSON. 569 



ERBY, Couch. Icon., XVI, 1866, pi. XLI, fig. 228.—'^ B. H. Wright, Check 

 List, 1888.— *P^TEL, Conch. Sam., Ill, 1890, p. 151. 



* Margaron ( JJnio) (lolnsun Lea, Syn., 1870, p. 61. 



Eastern Texas, north to Kansas, tlirougli southern Missouri, western 

 Tennessee, to the Alabama River drainage. 



tLAMPSILIS PERMISCENS Lea.' 



"^ Unio permiscens Lea, Pr. Ac. N. Sci. Phila.. Ill, 1859, p. 112; *J1. Ac. N. Sci. 

 Phila., V, 1862, p. 102, pi. xvii, fig. 251 ; ^ Obs., VIII, 1862, p. 106, pi. xvii, fig. 

 251 —"B. H. Wright, Check List, 1888. 



* Margaron ( Unio) permiscens Lea, Sj'n., 1870, p. 61. 



Tombigbee Eiver, Columbus, Mississippi. 



tLAMPSILIS GOULDII Lea.2 



* Unio gouldii Lea, Pr. Am. Phil. Soc, IV, 1845, p. 165 ; * Tr. Am. Phil. Soc, X, 1848, 



p. 76, pi. VI, fig. 16 ; -^^ Obs., IV, 1848, p. 50, pi. vi, fig. 16.—* Conrad, Pr. Ac. N. 

 Sci. Phila., VI, 1853, p. 2.50.— *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 

 494.— *B. H. Wright, Check List, 1888.— "P.etel, Conch. Sam., Ill, 1890, 

 p. 153. 



* Margaron ( Unio) gouldii Lea, Syn., 1852, p. 29; 1870, p. 46. 



Tuscaloosa, Alabama. 



(Group of Lampsilis saladoensis.) 



Shell smooth, obovate, iniiated, inequilateral, rounded behind, thin, 

 slightly thicker in front; beaks somewhat prominent, nearly smooth; 

 epidermis yellowish olive, shining, rayed; there is a slight carina high 

 up on the posterior slope; pseudocardinals small, lamellar, and oblique; 

 laterals lamellar and curved; anterior cicatrices distinct and well 

 impressed; posterior cicatrices confluent; dorsal cicatrices under the 

 plate, between the pseudocardinals and laterals; nacre bluish white 

 and iridescent.* Animal unknown. 



LAMPSILIS SALADOENSIS Lea. 



* Unio saladoensis Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 305; *.I1. Ac. N. Sci. 



Phila., IV, 1860, p. 370, pi. lxv, fig. 195; * Obs., VIII, 1860, p. 52, pi. lxv, 

 fig. 195. — B. H.Wright, Check List, 1888. — * Fischer and Crosse, Miss. Sci., 

 Pt. 7, II, 1894, p. 586. 



* Margaron (Unio) saladoensis Lea, Syn., 1870, p. 62. 



Rio Salado, ^ew Leon, Mexico. , 



1 There is only a single, young, poor specimen in the Lea collection, which may be 

 a valid species, but is quite likely a L. piirpuratus. 



2 Only a single, dead, badly worn shell is in Lea's collection. It is something like 

 a young umhrosiis, but if it really came from Tuscaloosa, Alabama, it probably belongs 

 to the Alatus group. I can not decide certainly as to its affinities. 



^Mr. Lea states that a single specimen of U. saladoensis was collected by Dr. Ber- 

 landier and presented to the Smithsonian Institution by Lieutenant Couch (Obs. 

 VIII, p. 53). I have never found this shell, and have not seen the species, and am 

 somewhat at a loss as to where to place it, but the figure and description would 

 indicate that it is a young shell of a form related to puriyiiratus; its rays, which 

 Dr. Lea says are nearest to U. amygdaluni, being different from those of any related 

 forms. 



