MONOGRAPH 



ON THE 



BRITISH FOSSIL 



BCHINODEEMATA 



FROM 



THE CRETACEOUS FORMATIONS. 



BY 



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



A'ICE-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 NINTH. 

 ON THE ECHINOCOEIDA 



Pages 301—324 ; Plates LXX— LXXV. 



LONDON: 



PRINTED FOR THE PALjEONTOGRAPHICAL SOCIETY. 



1881. 



