Medusae and Ctenophores from the Canadian Arctic 

 Expedition, 1913-18. 



By H. B. BIGELOW 



Museum of Comparative Zoology, Cambridge, Mass. 



The medusae and ctenophores described in the following pages were col- 

 lected by Mr. Frits Johansen, in shallow water at various localities along the 

 Alaskan coast, and the arctic coast of North America, between June, 1913, and 

 August, 1916. 



The material, in formalin, is in part excellently preserved, but in part so 

 fragmentary as to preclude satisfactory identification. As might be expected 

 of any collection of Medusae from the Arctic littoral, it consists for the most 

 part of well known and widely distributed arctic species. But it includes one 

 new Anthomedusa, the representives of which are, fortunately, in an excellent 

 state of preservation (p. 7n). 



To give an idea of the difficulties under which Mr. Johansen worked, and 

 the credit due him for making the collection at all, I can do no better than quote 

 his own words, from the field notes submitted to me: 



" The difficulties under which I collected Medusae and Ctenophora during the Canadian 

 Arctic Expedition were great. The opportunities for pelagic collecting were exceedingly few 

 and these had to be devoted to trawlings, etc. Best results were gained by working from the 

 fall ice in bays; but the temperature of the air, at this season, made the water freeze quickly 

 in the specimen jars, so often the Coelenterata collected were spoiled before I could reach the 

 house. The storing and the caring for the specimens collected during the three years hi the 

 Arctic was also trying ... as formalin specimens froze . . . and they thus represent 

 only a part of the Coelenterata actually observed, collected, and preserved." 



LIST OF SPECIES. 

 ANTHOMEDUSA 



PAGE 



Sarsia princeps (Haeckel) 4n 



Sarsia flammea Linko 4n 



Bougainvillea brittanica Forbes SH 



Rathkea blumenbachii (Rathke) 6H 



Halitholus cirratus Hartlaub 6n 



Eumedusa similis, gen. et sp. nov 7n 



TRACHOMEDUS.E 



Eperetmus typus Bigelow 9n 



Aglantha digitate (Fabricius) 10n 



NARCOMEDUS.E 

 Aeginopsis laurentii Brandt HH 



SCYPHOMEDUS^E 



Halidystus stejnegeri Kishinouye 12n 



Chrysaora sp. (?) 13n 



Cyanea capillata (Linne") 13n 



Aurelia limbata Brandt 14n 



CTENOPHORA 



Mertensia ovum (Fabricius) 15n 



Beroe cucumis Fabricius 1 5n 



Bolinopsis sp. (?) 15u 



