MONOGRAPH 



ON 



THE FOSSIL OPTIMA 



OF THE 



CRETACEOUS FORMATIONS. 



PART I. 



Pages 1—118 ; Plates I— XXXVII, with VIIa and IXa. 



t 



. CHELONIA (Lacertilia, &c). 



BY 



PROFESSOR OWEN, D.C.L., F.R.S., F.L.S., F.G.S., &c. 



Issued in the Volume for the Year 1851. 



LONDON : 

 PRINTED FOR THE P AL^O NTO G R A PHI C AL SOCIETY. 



1851. 



