ns 



CRETACEOUS LAMEi.LlHRANCllJ A. 



pass into forms with i.ulistinct folds like the tvpe of /. Curu'ri, Sow^rhy (Eig. 

 7:}), iiiul in some cases tht- fohls disappear altogetlier. 



'k 





Fig. ^G.-Inocera,nus Lamarcki va.. CuvicH Sow. The typeof I^'^^!'^^^^'^^'''^^'^^- 

 p. 216, pi. xxvii, &s- 10- Uppci' Chalk, near Brighton. Britisli MusLum, s\o. 

 Natural size. 



I. Wehster!, Mantell (Figs. 71, 72), Las the posteriov ear fairly well developed, 

 but not distinctly limited, and resembles /. Urongniarti of Planted ; it is 

 characterised l,v the thinness of the shell and the sharp ridge-Lko folds, but forms 



