8 c Canadian Arctic Expedition, 1918-18 



Order FORCIPULATA. 



Family ASTERIID^. 



Subfamily ASTERIINL*. 



Urasterias linkii (Miiller and Troschel) 



Station 436. Off Stapylton bay , Dolphin and Union strait ; 25-30 fathoms ; 

 sandy grey mud, with a few pebbles, and no algae; September 14, 1915. 



Twelve specimens, of which the largest measures R = 72 mm., r = 8 mm., 

 and the smallest R = 6 mm., r = l-5 mm. The colour in life, as recorded by 

 Mr. Johansen, was dorsally white or pale transparent rose with the violet 

 pyloric cceca showing through laterally, the spines and clusters of pedicellariae 

 and the ventral surface white. 



Asterias polythela Verrill. 



Station 200. Port Clarence, Alaska; 2-3 fathoms; sandy grey mud, with 

 algae (thread algae, Laminaria, etc.); August 4, 1913. 



Three specimens, of which the largest measures R = 90 mm., r= 16 mm. 



Asterias acervata borealis Perrier. 



Station 22. North of the mouth of the Kukpowruk river, Alaska (69 35' 

 N., 16327' W.); 11-12 fathoms; rock and sand, with algae; August 17, 1913 

 One specimen; R = 100 mm., r = 23 mm. 



Asterias anomala (Verrill) 



Station 200. Port Clarence, Alaska; 2-3 fathoms; sandy grey mud, 

 with algae (thread algae, Laminaria, etc.); August 4, 1913. 



One specimen, measuring R = 46 mm., r = 12 mm. 



The genus Allasterias, in which this species was originally described, is not 

 tenable. The character relied upon to separate it from Asterias, restricted, is 

 one of the most striking features of Asterias rubens and all of its close relatives. 



Asterias nortonensis (Verrill) 



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

 with algae; July 30, 1913. 



Twenty-seven specimens, all of approximately the same size. The 

 largest measures R = 94 mm., r = 23 mm. 



Ctenasterias cribraria (Stimpson) 



Station 37&. Inner harbour at Bernard harbour, Northwest Territories; 

 2-3 fathoms; sandy mud, with many algae (Laminaria, etc.); August 25, 

 1914. 



Five specimens, of which the largest measures R = 34 mm., r = 8 mm. 



Station 41. Outer harbour at Bernard harbour, Northwest Territories; 

 about 5 fathoms; sandy mud and Laminaria^', July 20, 1915. 



Fourteen specimens, the largest measuring R = 15 mm., r = 3-5 mm. 



Station 43c. West of Cockburn point, Dolphin and Union strait, North- 

 west Territories; 20-30 metres; grey mud with many stones and algae. 

 (Laminaria, Delesseria and Lithothamniori) ; September 14, 1915. 



One specimen; R=13 mm., r = 2-5 mm. 



