4 c Canadian Arctic Expedition, 1913-18 



Of the Echinoderms found in the region of Coronation gulf, the following five 

 occur both in the north Atlantic and in the Behring sea : 



Myriotrochus rinku Ctenodiscus crispatus 



Ophiozea robusta Crossaster papposus 



Ctenasterias cribraria 



the" folio wing three are inhabitants of the north Atlantic and Arctic only : 



Ophiocten sericeum Urasterias Linkii 



Asterias acervata boreaiis 



one, so far as known, inhabits part of the Arctic ocean and the coast of 

 Kamchatka : 



Leptasterias arctica 

 and one part of the Arctic ocean and the Aleutian islands : 



Leptasterias (?) dispar 



but the last two are very imperfectly known, and the last is quite likely even- 

 tually to prove to be nothing but the young of Asterias acervata. 



Thus the affinities of the fauna of the Coronation gulf region are clearly 

 with the fauna of the regions to the eastward, and the material brought back 

 resembles very closely collections at hand from the Hudson bay region and 

 northwestern Greenland. 



Excepting where otherwise stated the specimens were collected by Mr. 

 Frits Johansen, naturalist on the expedition. 



ECHINODERMA HETERORADIATA. 



Class ECHINOIDEA. 



Order CLYPEASTRINA. 



Family SGUTELLID^E. 



Echinarachnius parma (Lamarck) 



Station IQe. Off Kuskokwim bay, Alaska (59 24' N., 165 11' W.) ; 12^-13 

 fathoms; black sand; July 5, 1913. 

 Fragments, embedded in clay. 



Order CENTRECHINOIDA. 

 SUBORDER CAMARODONTA. 



Family STRONGYLOCENTROTID^). 

 Strongylocentrotus drobachiensis (0. F. Muller) 



Station 20, b and c. Grantley harbour, Alaska; 2-3 fathoms; sandy mud, 

 with algae; July 30, 1913. 



Twelve specimens, the largest 23 mm. in horizontal diameter, and 11 mm. 

 high. The colour of the tests is purple, that of the spines rather light green; 

 three have the longer spines dull reddish. 



