60 



given by Mr. Maiitell, I have been obliged to add 

 query to his quotation : it is probable that his J. 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 Clialk Pit near Royston by Mr. 

 Sowerby, and is the most perfect yet known. Frag- 

 ments attached tOj or imbedded in Flints, and casts of 

 large portions in Flint are not rare among alluvial 

 gravel. 



INOCEEAMUS Brongniarti. 

 TAB. CCCCXLl—Jig-s. 2 mid 3. 



Spec. Chak. Oblong, gibbose, with ?arge 

 transverse undulations ; anterior side an- 

 gular, lobed ; posterior side, flat, truncated 

 and smooth; beaks small, curved and 

 pointed. 



Syn. Inoceramus Brongniarti, 3Iafitell p. 214, 

 No. 85. 1. Lamarckii, Mantell, tab. 27. fig. 

 1. and}). 2 14. no. S^ in part. 



yY 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. 



