SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 



Bulletin 82 



A MONOGRAPH 

 OF THE EXISTING CRINOIDS 



BY 



AUSTIN HOBART CLARK 



VOLUME 1 

 THE COMATULIDS 



Part 4c— SUPERFAMILY TROPIOMETRIDA 



(the families Thalassometridae and Charitometridae) 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1950 



For sale by the Superintendent of Documents, U. S. Government Printing Office 

 Washington 25. D. C. - Price £2.25 



ISSUED AUG 16 1950 



