MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



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



COKKESPONDING MEMBER 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 FIFTH. 



ON THE SALENIDtE. 



Pages 161—184 ; Plates XL— XLIV. 



LONDON: 



PRINTED FOR THE PAL^EONTOGRAFHICAL SOCIETY. 



1872. 



