SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



PART OF VOLUME XXXV 



THE APODOUS HOLOTHURIANS 



A MONOGRAPH 



OF THE 



SYNAPTID^E AND MOLPADIID^E 



Including a Report on the Representatives of these Families in the 

 Collections of the United States National Museum 



BY 



HUBERT LYMAN CLARK 





(No. 1723) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 



1907 



