108 
I 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, andC. funatum, tab. 128 are great resemblances^ 
especially when more or less worn, asdn fig. 3, 
■fr W— I 1 
f v 
CERITHIUM dubium, 
TAB. CXLVII. — Fig. 5 . 
Spec. Char. Turreted ; whorls with a row of com- 
pressed tubercles near the middle, and two 
transverse rows of lesser tubercles below ; base 
with one or two rows of tubercles. 
1 he tubercles of the upper row are transversely 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. 
