V3 CONTRIBUTIONS 
nate ; substance of the shell rather thin ; spire somewhat 
produced, acute at the apex; suture small and irregular ; 
whorls seven, subangular above ; mouth rather narrow ; 
columella with two folds ; outer lip sharp. 
Length .9, Breadth .5, of an inch. 
Observations. This is the largest species I have noticed 
from this deposit. It occurs one half longer than the in- 
dividual figured. It more strongly resembles the V. spinosa 
(Lamarck) than any species I know, but differs somewhat 
in the form, and in not having such strong spines on the 
superior part of the whorl, these in our species being re- 
placed by very short spines or compressed tubercles. In 
some specimens these are disposed to be double, and in 
others the spines lengthen down the sides and form a kind 
of rib. A third, very small fold, may sometimes be ob- 
served in this species above the two large ones. 
V. gracilis. Plate 6. Fig. 180. 
Description. Shell ovately turbinate, transversely striate 
below, longitudinally and closely ribbed above, coronate ; 
substance of the shell thin ; spire turrited ; suture linear ; 
whorls six, angular and canaliculate above ; mouth nar- 
row, straight ; columella with two folds ; outer lip sharp. 
Length .6, Breadth .3, of an inch. 
Observations. 'This differs from the Defrancii, in being 
siriate only on the inferior part, and in having close longi- 
tudinal ribs. The end of the ribs are disposed to be granu- 
late at the angle. 
