A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BT 



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



COBEESPONDING MEMBER OP THE HOTAL SOCIETY OF SCIENCES OF LIEGE, 

 AND SENIOR SUEGEON TO TUE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART FIRST. 

 ON THE CIDARID^. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAnilCAL SOCIETY. 



1864. 



