MeduscB and Cteno-phora 15h 



certainly more closely allied to it than to A. aurita. From this it follows that 

 the arctic Aurelia is not only distinguishable from the Aurelia {A. aurita) of 

 boreal and temperate seas, but, hke other Arctic Medusae, is circumpolar. 



CTENOPHORiE. 

 Cydippida. 

 Family PLEUROBRAGHIIDyE Chun. 



Mertensia ovum (Fabricius). 



Beroe ovum Fabricius, 1780, p. 362. For synonymy, see Mayer, 1912, p. 8. 



No specimens of this species (at least none recognizable as such) were to 

 be found in the collection. But it is recorded in Mr. Johansen's field notes as 

 being common at Camden bay, Arctic coast of Alaska, during September and 

 October, 1913. 



Beroida. 



Family BEROIDA Eschscholtz. 



Beroe cucutnis Fabricius. 

 Beroe cucumis Fabriciiis, 1780, p. 361. For synonymy, see Mortensen, 1912, p. 83. 



Station 57a, cape Smyth, point Barrow, Alaska, August 8, 1916; 1 small 

 specimen, about 14 mm. high, and numerous fragments. 



The material is not in sufficiently good condition to add anything to the 

 earlier accounts of this well-known species. For a discussion of its systematic 

 relationship to the various other "species" of Beroe, I refer the reader to Mor- 

 tensen (1912). 



LOBATA. 



Family BOLINOPSID^ Bigelow. 



Bolinopsis sp.? 



Bolinopsis (as " Bolina ") is recorded in Mr. Johansen's field notes as 

 common during September and October, 1913, at Camden bay, Arctic coast 

 of Alaska. But no specimens were successfully preserved. 



GEOGRAPHICAL DISTRIBUTION. 



The interest of tlie present collection is much enhanced by the fact that it is 

 only the second ever made on the Arctic coast of North America. In fact, 

 although collections have been made in Bering sea on the one hand (Brandt, 

 1838; Bigelow, 1913), along the, Labrador coast and at various fjords and har- 

 bours in Greenland on the other, there is not a single record of any Medusa, so 

 far as I have been able to learn, between Hudson straits on the east, and Ber- 

 ing straits on the west, except for a few records from the neighbourhood of 

 point Barrow (Fewkes, 1885; Murdoch, 1885). 



The Medusa fauna of the Arctic coasts of Europe, and of Spitzbergen has, on 

 the other hand, been the subject of such exhaustive study at so many hands 

 that in its general characteristics it may be regarded as fully as well known as that 

 of more temperate coasts And the Medusae of the northern coasts of eastern 



