﻿66 LAMPS I LIS 



Gould reports L. radiata from the north shore of Lake 

 Superior, and there is a shell in the U. S. National Museum 

 from the northwest l>oun(larv of Wisconsin, which is probably 

 this species. 



\'ar. conspictta (IvCa). 



v^hell. subsolid, somewhat rhomboid and elong^ate. subin- 

 flated : beaks rather full : epidermis decidedly concentrically 

 wrinkled, yellowish to jj^reenish-brown, faintly rayed; nacre 

 straw-colored, buff, salmon or reddish. 



Length it 5, height 67, diam. 40 mm. 



North Carolina and Southern Virginia. 



Type locality, Yadkin River, vSalisbury, N. C. 

 Vnio conspicuns Lea. Pr. Ac. N. Sci. Phila.. II, 1872. p. 156; 



Jl. Ac. N. Sci. Phila., VIII, 1874 ,p. 34, pi. xi. fig. 31 ; Obs., 



XIII. 1874, p. 38. pl. XI, fig. 31. 

 Lampsilis radiatus var. conspicuns Simpson, Syn., 1900, p. 536. 



A very abundant species distributed throughout nearly the 

 entire Atlantic drainage. It varies greatly in size, form, de- 

 gree of inflation, and solidity, and .sometimes approaches so 

 near to lutcola that it is well-nigh impossible to separate the 

 two. The texture of the two species is different, the radiata 

 generally having a somewhat roughened epidermis, while that 

 of lutcola is usually smooth and bright. The nacre of the 

 latter species is white, of a fine. ])orcellaneous texture, while 

 that of radiata is dull and sometimes almost lurid. The variety 

 conspicua is quite different from the ordinary manifestation of 

 the species, being solider, more rhomboid and inflated than 

 most specimens of radiata, but there are intennediates, which 

 seem to fully connect the two. I have only seen male shells 

 of the variety. 



Lampsii.is hydiana (Lea). 



Shell of moderate size, normally subsolid but sometimes 

 rather thin, long elliptical, ordinarily much inflated ; beaks full 

 and high, their sculpture delicate, consisting of faint, somewhat 

 corrugated double loops, the hinder open behind ; surface 

 smooth and shining, sometimes faintly concentrically sculp- 



