A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



THOMAS WRIOHT, M.D., F.R.S. Edin., F.O.S., 



CORRESPONDING MEMBER OF THE BOYAL SOCIETY OF SCIENCES OF LIEGE, THE SOCIETY OF 



NATUEAX SCIENCES OF NEUFCIIATEL, AND SENIOR SURGEON TO 



THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART SECOND. 

 ON THE CIDARIDtE AND BIADEMAD.E. 



Pages 65-113; Plates IX, X, XII— XXL, XXI a, XXI b. 



LONDON: 



PRINTED FOR THE PAL/EONTOGRAPHICAL SOCIETY. 



1868. 



