ADDENDUM. 181 
material difference between it and some of the recent forms of pespelicani. A. Mac Andree 
is probably only a variety. Chenopus deciscens, Phil., I do not know, but this is described 
as “ultimo quadricarinato carinis nodulosis,’ while my shell has only three keels or ridges. 
Ceriruium (TrirorIs) PERvVERSUM ? Zinné, var. Beli. Addendum Plate, fig. 17. 
Locality. Cor. Crag, Sutton. 
The above figure represents a small specimen sent to me by Mr. Robert Bell without 
a name. 
The two forms or varieties called C. perversum and C. adversum (the latter of which 
is rather more slender than the other) are both found in the Cor. Crag at Sutton; but I 
have seen nothing so cylindrical as the present specimen. ‘The recent shell, to which 1 
have doubtfully referred it, is described by Mr. Jeffreys as variable, the volutions having 
three and sometimes four bands (‘ Brit. Conch.,’ vol. iv, p. 261). 
As our present shell has four unequal ridges (the lowest one very small, and the next 
one to it large and nodulous) I have not ventured to consider it as a distinct species on 
the strength of a solitary specimen, though, should more specimens occur, the question 
of its specific separation might with more reason be entertained. 
CERITHIOPSIS TUBERCULARIS, Mont. Crag Moll., p. 70, Tab. VIII, fig. 5, Supplement, 
p: 52. 
Since the first part of this ‘Supplement’ was issued Mr. Jeffreys kindly sent me for 
examination his British recent specimens, from which he formed two distinct species, 
under the names of C. Barleei and C. pulchella (‘ Brit. Conch.,’ vol. v, Pl. 81, figs. 2 and 3). 
It does not appear to me that these shells present sufficient differences from ¢ubercularis 
to entitle them to specific isolation, but they have all their exact representations among 
the Cor. Crag specimens. ‘The principal differences appear to be a basal ridge or 
prominent spiral line which is present in some of my Crag specimens. Under these 
circumstances I have still retained them under the same specific name of tudercularis. 
Var. subulata, of ‘Crag Moll.” Tab. VIII, fig. 5 4, represents C. Barleei, and var. nana 
fig. 5 ¢ represents C. pulchella, the convexity in the volution of this latter being 
probably caused by its abbreviated spire. 
I have adopted the above generic name in deference to the malacologists, who say 
that there is a great difference in the animal from that of Cerithium, and this is 
also strengthened (it is said) by the present genus possessing a longer canal. 
