VIVIPARA. 27 



*^% /Shell gibbous. 



15. VIVIPARA GIBBA, Currier. 



Plate 12, figs. 3 to 7. 



Shell rhombic, imperforate, ' rather thick ; 

 whorls 6, well rounded, with imj)ressed sutures, 

 the last subangulate on the periphery ; aper- 

 ture rhombic, half the length of the shell. 

 Greenish-brown, polished, rufous within. 



Length 27, diam. 20 mill. 



Michigan, Western New York. 



The largest figure is taken from a specimen 

 from Mohawk, N. Y., sent to me by Dr. Jas. 

 Lewis, who suggests that it is a monstrosity of 

 V. rufa. Fig. 3 is from the type. Although 

 allied to rufa in color, I am inclined to accept 

 it as a species, as the form appears to me to 

 be persistent. 



(53) 



