PLATE 36, 37. 
present figure exhibits it detached, and is about the size of 
the more common specimens. It sometimes occurs con- 
siderably larger. 
FIG. 2. 
CONCHYLIOLITHUS Anomites (triangularis) tri- 
gonus, longitudinaliter suicatus, sinu angulato lacvi. 
S. p. 
Dltfers from C. A. trigonalis, principally in the sides 
being direct or straight, not rounded, forming acute angles 
with the hinge ; and in the sinus, which is smooth and 
angular, instead of being rounded and striated, as in that 
species. 
A much less common fossil than the foregoing, with 
which, however, it is sometimes found. Our specimens 
were collected near Buxton. It rarely occurs in a perfect 
state ; one or both of the corners, which the extended 
hinge forms with the sides, being for the most part broken. 
Fig. 2. Represents a specimen thus mutilated. 
