The Echinoderms of the Canadian Arctic Expedition, 



1913-18. 



By AUSTIN H. CLARK. 



The Canadian Arctic Expedition brought back two thousand and twenty- 

 four .Echinoderms, representing a total of twenty species, the names of which 

 follow : 



ECHINOIDEA. 

 Echinarachnius parma Strongylocentrotus drobachiensis 



HOLOTHUROIDEA. 



Myriotrochus rinkii 



OPHIUROIDEA. 



Stegophiura nodosa Ophiocten sericeum 



Ophiozea robusta Amphiodia craterodmeta 



ASTEROIDEA. 



Ctenodiscus crispatus Asterias nortonensis 



Crossaster papposus Ctenasterias cribraria 



Urasterias linkii Stenasterias macropora 



Asterias polythela Leptasterias arctica 



Asterias acervata borealis Leptasterias (?) dispar 



Asterias anomala Leptasterias epichlora 



Leptasterias, sp. 



Of these the following ten were met with in the Arctic ocean only : 



Myriotrochus rinkii Urasterias linkii 



Ophiozea robusta Asterias acervata borealis 



Ophiocten sericeum Ctenasterias cribraria 



Ctenodiscus crispatus Leptasterias arctica 



Crossaster papposus Leptasterias (?) dispar 



the following seven were found only in Behring sea : 



Echinarachnius parma Asterias anomala 



Amphiodia craterodmeta Asterias nortonensis 



Asterias polytheta Stenasterias macropora 



Leptasterias epichlora 



and the following two were collected both in the Behring sea and in the Arc tic 

 ocean : 



Strongylocentrotus drobachiensis Stegophiura nodosa 



3c 



