60 
given by Mr. Mantell, I have been obliged to add 
query to his quotation : it is probable that his I. latus is 
a flat variety only, for some specimens of J. Cuvieri are 
without waves for a considerable extent, and then have 
several large ones. 
Common in Chalk every where. The specimen 
figured, is the same given in the Linnean Transactions ; 
it was picked up in a Chalk Pit near Royston by Mr. 
Sowerby, and is the most perfect yet known. Frag- 
ments attached to, or imbedded in Flints, and casts of 
large portions in Flint are not rare among alluvial 
gravel. 
INOCERAMUS Brongniarti. 
TAB. .CCCCXLI .—Jigs. 2 and 3. 
Spec. Char. Oblong, gibbose, with large 
transverse undulations ; anterior side an- 
gular, lobed ; posterior side, flat, truncated 
and smooth ; beaks small, curved and 
pointed. 
Syn. Inoceramus Brongniarti, Mantell p. 214, 
No. 85. 1. Lamarckii, Mantell , tab . 27. fig . 
1. andp. 214- no. 84 in part. 
"W ell distinguished by the flat, broad, cordate form of 
the posterior side, upon the borders of which the lines 
of growth and larger waves that occupy the other part 
of the shell are completely lost ; each valve is nearly as 
deep as it is wide ; its length is rather less than twice 
its width. 
If we may judge from the fragment of a hinge that is 
here figured, and which, from the flatness of the pos- 
terior side, seems to be of the same species with the 
small example ; this is as gigantic a shell as the last. 
