9 
CUCULL^BA carinata. 
TAB. CCVU.—Fig. l. 
Spec. Char. Obliquely cuneiform, smooth ; an- 
terior side pointed, and distinguished by a 
ridge running up to the beak. 
I^ENGTH 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. 
CUCULLJEA fibrosa. 
TAB. CCVU.—Fig. 2. 
Spec." Char. Obovate, gibbose, with numerous 
logitudinal elevated striae upon the surface ; an* 
tenor margin straight, prominent near the 
hinge. 
Xjength 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 Caicedony, in a sandstone holding mica and 
green sand; found at Black Down, and transmitted to 
me by Miss E. Hill. 
