A MONOGRAPH 



ON THE 



BKITISH 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, THE SOCIETY OF 



NATURAL SCIENCES OF NEUFCUATEL, AND SENIOR SURGEON TO 



THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART SECOND. 

 ON THE CIDARIDiE AND DIADEMAD^E, 



Pages 65-112; Plates IX, X, XII -XXL, XXI a, XXI b. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1868. 



