ipaUxontoovapbical Soctct\>, 1007. 



A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



FEOM 



THE CRETACEOUS FORMATIONS. 



VOLUME SECOND. 

 THE ASTEROIDEA AND OPHIUEOIDEA. 



BY 



W. K. SPENCER, B.A., F.G.S. 



PART FOURTH. 

 Pages 91—132; Plates XXVII— XXIX. 



LONDON: 



PRINTED FOR THE PALiEONTOORArUICAL SOCIETY. 



1907. 



