MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



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



C01iKKSP0NI)IN(T MEMliEll OF THE EOYAL SOCIETY OF SCIENCES OF LIEGE, THE SOCIETY OF 



NATUIiAL SCIENCES OF NEUFCHATEL, AND SENIDll SURGEON TO 



THE CHELTENHAM HOSPITAL. 



VOLUME FIRST. 



PART FOURTH. 

 ON THE DlADEMADiE AND SALENIDyE. 



Pages 137—160 ; Plates XXX— XXXIX. 



LONDON : 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1871. 



