99 
CARDIUM semigranulatum. 
TAB. CXLIYV. 
Spec. Cuar. Gibbose, transverse, subtriangular, 
longitudinally striated, posterior side straight, 
longitudinally sulcated, and largely granulated. 
er 
V ery similar to the Cardium edule in general form, but 
often twice as large ; it is a slender shell, smooth to the 
touch, but is covered with fine longitudinal striz ; upon the 
posterior side the strie are enlarged and become sharp 
sulci, on the ridges between these sulci are many small 
irregularly globose tubercles or granules; the edge is 
minutely dentated. 
Of this Cardium some large fragments were presented 
to me from Barton Cliff, by Miss Benett; I had pre- 
viously received small ones by favour of the Rev. W. 
Bingley, and, in 1814, Mr. Bullock was so kind as to 
present me with a small, nearly entire specimen, from 
the Clay stratum, related to that of Highgate, in the 
Regent’s Park, since which, in 1815, the same species 
has been found in the continuation of the same stratum, 
near the White Conduit House, at Islington. I do not 
know that it was ever found at Highgate, although many 
Shells like the Highgate productions were found with it; 
it was accompanied in these places by two or three other 
species of shells not found at Highgate and some stems 
of Pentacrini, with the appearance of the shelly substance 
about them ; none such were found at Highgate, and I 
am pretty confident no specimen of Argonauta was found 
there, although report has said there was. 
