A MONOGRAPH 



ON THE 



BRITISH FOSSIL 



ECHINODERMATA 



OF 



THE OOLITIC FORMATIONS, 



BY 



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



PART FIRST, 



CONTAINING 



THE CLDARIM], HEMICIDABI&ZE, AND DIADEMAD.^. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1855. 



