fcnurirs of % Ufaswra of Comparafifw Soblogy 



AT HARVARD COLLEGE. 



Eighty-Three Plates to Accompany. 



Vols. XX. and XXI. 



THE NORTH AMERICAN 



CRINOIDEA CAMERATA. 



By CHAELES WACHSMUTII and FEANK SPEINGER. 



EIGHTY-THREE PLATES. 



CAMBRIDGE, U.S.A.: 



^rtttUtr for tfje Jttusntnt 



May, 1897. 



