.moixs of i^t llusmm of Comparatitre goolojg 



AT HARVARD COLLEGE. 

 Vol. XX. 



THE NORTH AMERICAN 



CRi:^OIDEA CAMERATA 



O 



o 



By CHAELES WACHSMUTH and FEANK SPEINGEE. 



IN TWO VOLUMES WITH EIGHTY-THREE PLATES. 



Vol. I. 



CAMBRIDGE, U.S.A.: 



irtntetr for tfje &iuHum. 



May, 1897. 



