108 
T have found these most abundantly at Charlton in « 
stratum of Clay above the sand, and rarely, if at all, 
elsewhere, although not easily distinguished till compared, 
and as difficult to describe; C. funiculatum from Plum- 
stead, and C. funatum, tab. 128 are great resemblances, 
especially when more or less worn, as in fig. 3. 
CERITHIUM dubium, 
TAB. CXLVIL.—Fig. 5. 
Spec. Cuar. Turreted ; whorls with a row of com- 
pressed tubercles near the middie, and two 
transverse rows of lesser tubercles below ; base 
with one or two rows of tubercles. 
G0, 
Tae tubercles of the upper row are trausversely com- 
pressed and sharp, they are placed at about one-third the 
length of the whorl from its upper edge. 
Mr. Holloway found the present specimen at Stub- 
bington and he has found Cerithium giganteum there, 
from which it would appear to accord with some of the 
French formations. This may possibly be a large 
variety of Cerithium calcitrapoides of Lamarck, described 
in his account of the Fossil shells found in the environs 
of Paris, p. 82. 
