A MONOGRAPfl 



ON THE 



BRITISH FOSSIL 



ECHINODE RMATA 



PROM 



THE CRETACEOUS FORMATIONS. 



BY 



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



CORRESPONDING MEMBEK OF THE ROYAL SOCIETY OF SCIENCES OF LIEGE, THE SOCIETY OF 

 NATURAL SCIENCES OF NEUFCHATEL, AND SENIOR SURGEON TO 

 THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART THIRD. 

 ON THE DIADEMADiR. 



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



LONDON: 



PRINTED FOR THE PAL.EONTOGRAPHICAL SOCIETY. 



1870. 



