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) 



Ittft 



SMITHSONIAN INSTITUTION 

 WASHINGTON, D. C. 





QL 

 3841 



C8 

 C52 



