OBSERVATIONS. 



This shell occurs in the eastern waters, particularly in 

 Frankford Creek, near Philadelphia, and Professor Van- 

 uxem gave me specimens which he obtained from a stream 

 in New Jersey. It is closely related to M. virginica. Nob. 

 but may be distinguished by its stria?. 



REFEnENCE TO THE PLATE, 



Fig. \i, back view. 



n. 47 



MELANIA SEMICAKINATA, 



DESCRIPTION. 



Shell small, conic-turreted ; spire acute at the apex, the 

 four apicial volutions carinate below; volutions about 

 eight, somewhat convex ; suture moderately impressed ; 

 surface, especially of the body whorl slightly wrinkled ; 

 labrum a little prominent near the base ; witliin slightly 

 tinged with reddish brown. 



3YN0NYM. 



M. SEMicAuiNATA, Nob. Dmcmiualor oj Lsr/ul Knoiv 

 ledge, Vol 3. 



