flDemoirs of tbe flDuseum of Comparative ZooIoqv 



AT HARVARD COLLEGE. 

 Vol. XLVI. No. 1. 



HAWAIIAN AND OTHER PACIFIC ECHINI. 



THE CLYPEASTRIDAE, ARACHNOIDIDAE, LAGANIDAE, 

 FIBULARIIDAE, AND SCUTELLIDAE. 



BY 



HUBERT LYMAN CLARK. 



WITH TWENTY-TWO PLATES. 



Plates 122-143. 



[Published by Permission of H. M. Smith, U. S. Fish Commissioner.] 



CAMBRIDGE, U.S.A.: 



printeo for tbe /IDuseum. 



June, 1914. 



