180 
little, else the sides of the cone would be very straight : 
the ridges vary in size ; the largest are towards the lower 
part of each whorl, with minute Intervening ones ; the 
granulated ridges have small plain ones between them. 
Specimens from the Holywells estate, from two to six 
lines high : it does not appear to be rare. It hears a 
general resemblance to several species. 
TROCHUS concavus.* 
TAB, CLXXXL —Fig. a. 
Spec. Char. Conical ; sides of the whorls concave ; 
base flatfish ; margin ear floated ; aperture 
acutely rhomboidal ; umbilicus none. 
A. few obscure transverse sir he decorate the spire ; in 
the concave part of each whorl is an indistinct row of 
tubercles ; the base is smooth, a little broader than the 
height of the spire. 
The Rev. H. Steinhaur found this shell in the inferior 
Oolite at Little Sodbury. It is distinguished from the 
next with which it agrees in general form, by the trans- 
verse striae, single carioa, and solid columella. 
