PLATE 45,. 47, 48, 49. 
ther not figured in the present volume. These, by uniting 
the form of A. cuspidatus with that of the more commom 
straight-hinged perforated Anomita, evince the propriety of 
placing them together, in the same division, which for 
some time I was doubtful of. 
A few years back, I laid a description of this fossil before 
the Linnean Society (vide Linn. Trans, vol. 4. p. 4.) That 
description will be found to differ in some trifling respects 
from the one now given. For, as I had not then discovered 
the two species above alluded -to, I was not aware of the 
gradation of form connecting this shell with its more com- 
mon congeners ; and, of course, considered it as a species 
constituting a distinct tribe or division of the genus. The 
gradation of form, I speak of, is first evident in subconicus 
(p. 47. f. 6, 7, 8.) In this shell we may observe, that the 
conic valve is less elevated or pyramidal, than m cuspidatus; 
consequently its apex, or, properly speaking, its beak is not 
so far removed from that of the other valve, and the hinge 
or flat side is smaller, approaching nearer to the form of this 
part in triangularis and trigonalis, pi. 47. fig. 5, 7, 8. In 
the other Anomite, which I have not as yet named or 
described, the hinge is still less, and the beak of the large 
valve, instead of being straight, is somewhat incurved, as 
in A. triangularis, with which it appears to have a close 
affinity, though perfectly a distinct species. 
Fig. 3 represents a specimen, in grey limestone, of A. 
z 
