130 SUPPLEMENT TO THE CRAG MOLLUSCA. 
added more to our knowledge of living European and Atlantic Mollusca) sent me for 
examination two specimens from the Mediterranean of a shell considered to be identical 
with this species. These scarcely exceed half an inch in diameter, and if full grown would 
be much more tumid than my Crag specimens. ‘They were also more coarsely striated or 
radiated. Under these circumstances I am not satisfied that Lajonkairii is a living species. 
Cuama crypHorpes, Linné. Crag Moll., vol. u, p. 162, Tab. XV, fig. 8. 
Localities. As in ‘Crag Moll? 
When describing this shell in the ‘Crag Moll.’ I stated it to be very rare in the 
Cor. Crag, and it has ever since continued so to my researches. The specimens found 
by me in the Cor. Crag have always been very small or young individuals, while those 
from the Red Crag appear all to be full-grown specimens or nearly so. The solidity of the 
specimens would well protect them in a removal from one formation into another, and 1 
believe, notwithstanding its present scarcity in the Cor. Crag, that the specimens which have 
been found in the Red Crag of Sutton are extraneous. 
In Mr. Jeffrey’s List of Red Crag Shells appended to Mr. Prestwich’s paper, ‘ Geol. 
Journ.,’ vol. xxvii, p. 482, this species is given as from Walton, but upon whose authority 
is not stated. I have never seen it from that locality, but if it be so I should then be more 
disposed to regard it as a denizen of the Red Crag Sea, and as additional evidence of the 
greater antiquity of the Walton bed over the rest of the Red Crag. 
Verticorpia carpurormis, S. Wood. Crag Moll., vol. ii, p. 150, Tab. XII, fig. 18 (as 
Hippagus verticordius). 
Locality. Cor. Crag, Sutton. 
Mr. Jeffreys in his list appended to Mr. Prestwich’s paper (‘ Geol. Journ.,’ vol. 27, 
p. 139) has referred this Crag species to what he has called Pecchiolia acuticostata, and 
he has obligingly sent me a single valve for examination. I find this recent shell to 
differ from the Crag species in being much more tumid and in having the ribs more 
elevated. In the recent shell these ribs are ornamented with a double row of very fine 
spinule, not a trace of which can I discover upon any of my Crag specimens. ‘These may 
possibly have been rubbed off, but the probabilities are that had they ever existed some 
trace would remain on one or other of the ribs of the numerous well-preserved Crag 
specimens that I have examined; but I can detect none. The number of ribs is probably 
not a reliable character, but while this recent specimen had only fourteen ribs my Crag 
specimens vary from that number to seventeen. I do not feel justified under these 
circumstances in adopting the identification of the Crag shell with acuticostata. In my 
‘Hocene Bivalves’ (page 138) I have given reasons for recurring to my original generic 
name of Ferticordia for the group of Mollusca to which the present shell belongs; and im 
consequence I have reverted to the specific name of Cardizformis, under which I originally 
sent it to the ‘Min. Con.’ in 1844 (Tab. 639). 
