VIVIPARA. QT 
#*, Shell gibbous. 
15. VIVIPARA GIBBA, Currier. 
Plate 12, figs. 3 to 7. 
‘Shell rhombic, imperforate, rather thick ; 
whorls 5, well rounded, with impressed 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) 
