28 



May not this be a variety of the preceding 

 species ? It seems to differ principally in shape, 

 being less ventricose, and less dilated posterior- 



SPECIES XVI. Lampsilis fasciola (Unio 

 fasciola.) 



Shell oval, dilated posteriorly, ventricose, 

 somewhat thick; epidermis olivaceous with bands, 

 radiated, flexuous, unequal, greenish. Length | 

 diam. f axis ^ of the breadth ; nacre bluish 

 white. 



Rare ; found in the Kentucky ; breadth two to 

 three inches ; cardinal tooth small, superior part 

 furrowed, smooth and inclining inferiorly ; lamel- 

 lar tooth slender, plaited.* 



* The two following species, which I discovered in the 

 Hudson river, ought to belong to this genus. 



Lampsilis rosea. Oval, dilated and truncated obliquely, 

 posteriorly ; shell thick, wrinkled ; epidermis olivaceous ; 

 black posteriorly ; nacre roseate ; very ventricose ; apices 

 prominent. Length 5-8 diam. 1-2 axis 4-5 of the 

 breadth. 



Lampsilis pallida. Oval, dilated and rounded posterior- 

 ly; shell thick, wrinkles separated ; epidermis reddish olive 

 with brown rayr, ; oblique posteriorly ; nacre white. 

 Length 3-4 diarr.. 1-2 axis 4-5 of the breadth. 



