/IDemotrs of tbe flDuseum of Comparative Zooloap 



AT HARVARD COLLEGE. 

 Vol. XLVI. No. 2. 



HAWAIIAN AND OTHER PACIFIC ECHINI. 



THE ECHINONEIDAE, NUCLEOLITIDAE, URECHINIDAE, ECHINO- 



CORYTHIDAE, CALYMNIDAE, POURTALESIIDAE, PALAEOSTO- 



MATIDAE, AEROPSIDAE, PALAEOPNEUSTIDAE, 



HEMIASTERIDAE, AND SPATANGIDAE. 



BY 



HUBERT LYMAN CLARK. 



WITH EIGHTEEN PLATES. 



Plates 144-161. 



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



CAMBRIDGE, U.S.A.: 



lprinteo for tbe flDuseum. 



March, 1917. 



