palaeontoorapbical Society 1907. 



A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



PEOM 



THE CRETACEOUS FORMATIONS. 



VOLUME SECOND. 

 THE ASTEEOIDEA AND OPHIUROIDEA. 



BY 



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



PART FOURTH. 



PAGES 91132; PLATES XXVII XXIX. 



LONDON: 



FEINTED FOE THE PAL^ONTOGEAPHICAL SOCIETY. 



1907. 



