A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



THOMAS WRIGHT, M.D., F.R.S. Edin., F.G.S., 



CORRESPONDING MEMBER OF THE ROYAL SOCIETY OF SCIENCES OF LIEGE, 

 AND SENIOR SURGEON TO THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART FIRST. 

 ON THE CIDARIILE. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1864. 



