9 
CUCULLAA carinata. 
TAB. CCVII.—Fig. 1. 
Spec. Cuar. Obliquely cuneiform, smooth; an- 
terior side pointed, and distinguished by a 
ridge running up to the beak. 
Leners and breadth nearly equal; but the ridge that 
bounds the anterior side being very oblique, is one 
sixth longer than the width. The acuteness of the angle 
made by the anterior side, with the remaining surface, is 
sufficient to distinguish this from C. glabra (tab. 67.) the 
smoothness of the surface may arise from wear. 
A silicious cast from Black Down. 
CUCULLAA fibrosa, 
TAB. CCVII.—Fig. 2. 
Spec. Cuar. Obovate, gibbose, with numerous 
logitudinal elevated strize upon the surface ; an- 
terior margin straight, prominent near the 
hinge. 
Lencra less than the width ; in its general aspect much 
resembling C. glabra, but it is less oblique, and the 
anterior side is more gradually rounded unto the middle; 
the lines upon the surface are sharp, and frequently 
crossed by the lines of growth. 
Cast in Calcedony, in a sandstone holding mica and 
green sand; found at Black Down, and transmitted to 
me by Miss E. Hill. 
