A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



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 OP NEUFCHATEL, AND SENIOR SURGEON TO 

 • THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART THIRD. 

 ON THE DIADEMADiE. 



Pages 113—136 ; Plates XXU— XXIX, XXIXa, XXIXb. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1870. 



