63 
CERITHIUM geminatum* 
TAB. CXXVIL— Fig. 2. 
Spec. Char. Conical, elongated, smooth, with 
seven or eight longitudinally disposed pairs of 
acute tubercles on each whorl ; whorls about 
twelve; lip even. 
There are two obsolete transverse carinae, extending 
from one pair of tubercles to the next; the upper tubercle 
of each pair is the largest* particularly upon the last 
whorl* where it is often bifid; on this whorl are also two 
other rows of small tubercles, visible; the aperture is 
nearly round, with a very slightly recurved beak, 
I believe this is a rare shell, even at Barton Cliff, from 
whence I am favoured with it by the Rev. Mr. Iremonger, 
who has generously allowed me to take many of the most 
rare and perfect of his specimens, for public information 
—this is the best specimen I have seen ; but I possess a 
smaller one from the same place, by favour of the Rev. 
W. Bingley. 
