Echinoderms. He 



Station 43c, West of Cockburn point, Dolphin and Union strait, Northwest 

 Territories; 20-30 metres; grey mud, with many stones and algae (Laminaria, 

 Delesseria and Lithothamniori) ; September 14, 1915. 



Strongylocentrotus drobachiensis Crossaster papposus 



Ophiozea robusta Ctenasterias cribraria 



Ophiocten sericeum Leptasterias arctica 



Leptasterias (?) dispar 



Station 44c. Beach at cape Barrow, Coronation gulf, Northwest Territories ; 

 August 3, 1915. J. J. O'Neill collector. 



Strongylocentrotus drobachiensis 



Station 44e. Kannuyuk island, Bathurst inlet, Coronation gulf, Northwest 

 Territories; 1 fathom; September 2, 1915. R. M. Anderson, collector. 



Strongylocentrotus drobachiensis 



ADDENDA. 



The following Echinoderms were collected by the Northern Party of the 

 Canadian Arctic Expedition and received in Ottawa after the above report 

 had been written: 



Strongylocentrotus drobachiensis (0. F. Miiller). 



Stations 63c, d. Walker bay, Prince of Wales strait, Victoria island. J. 

 Hadley, October 2, 1916. 15 specimens. Identified by Austin H. Clark. 



Psolus phantapus (Strussenfeldt) Jager. 



Station 63a. W T alker bay, Prince of Wales strait, Victoria island. J. 

 Hadley, July 30, 1917. 1 specimen. Identified by Hubert Lyman Clark. 



Additional data for the Report on Echinoderms of the 

 Canadian Arctic Expedition, based upon specimens from the 

 "Neptune" and other Eastern Arctic Expeditions. 



By A. H. CLARK. 



ECHINOIDEA. 

 Strongylocentrotus drobachiensis (O. F. Muller). 



Port Leopold, North Somerset, Northwest Territories; Neptune Expedition, 

 August 17, 1904. 3 specimens. 



Richmond gulf, east side of Hudson bay (ca. 56 lat. N.); 15-30 fathoms. 

 A. P. Low, June, 1899. 2 specimens. 



Near mouth of Povungnituk river, east side of Hudson bay (ca.60 lat. N.) ; 

 5-6 fathoms. A. P. Low, August, 1898. 2 specimens. 



