DEPARTMENT OF MARINE BIOLOGY 



OF 



THE CARNEGIE INSTITUTION OF WASHINGTON 

 ALFRED G. MAYOR, DIRECTOR 



PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY 



OF THE 

 CARNEGIE INSTITUTION OF WASHINGTON 



VOLUME XVI. 



STUDIES IN THE DEVELOPMENT OF CRINOIDS 



BY 



TH. MORTENSEN 

 Of The University of Copenhagen 



PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 

 WASHINGTON, 1920 



