MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



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



VICE-PRESIDENT OF THE PAL.EONTOGRAPH1CAL SOCIETY; CORRESPONDING MEMBER OF THE ROYAL SOCIETY OF SCIENCES 



OF LIEGE ; THE SOCIETY OF NATURAL SCIENCES OF NEUCHATEL ; VICE-PRESIDENT OF THE COTTESWOLD 



NATURALISTS' FIELD CLUB; CONSULTING SURGEON TO THE CHELTENHAM HOSPITAL; 



AND MEDICAL OFFICER OF HEALTH TO THE URBAN SANITARY DISTRICTS 



OF CHELTENHAM, CHARLTON-KINGS, AND LECKHAMPTON. 



VOLUME FIRST. 



PART EIGHTH. 

 ON THE SPATANGID^ AND ECHINOCOMIXE. 



Pages 265—300 ; Plates LXIIa, LXIII— LXIX. 



LONDON: 



PRINTED FOR THE PALiEONTOGRAPHICAL SOCIETY. 



1878. 



