Memoirs of the Museum of Comparative Zoology 
3 AT HARVARD COLLEGE. 
Vou. XXI. 
TOE NORTH AMERICAN 
CRINOIDEA CAMERATA., 
By CHARLES WACHSMUTH axp FRANK SPRINGER. 
IN TWO VOLUMES WITH EIGHTY-THREE PLATES. 
CAMBRIDGE, U.S. A.: 
Brinted tor the Museum. ee 
May, 1897. 
