SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 65, NUMBER 10 



A Phylogenetic Study of the Recent Crinoids, with 

 Special Reference to the Question of Spe- 

 cialization Through the Partial or Complete 

 Suppression of Structural Characters 



BY 

 AUSTIN H. CLARK 



(Publication 2369) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



AUGUST 19, 1915 



