606 ^^ Stephensen. 



and has also been taken there by the Danmark Exped. At Siberia 

 it is so common that it is a characteristic form botli W. and E. of 

 Cape Tscheljuskin (Stuxberg, Bihang .... vol 5, 1880). At Norway 

 it is found at any rate at Tromsø, perhaps at Molde (Sars "Account"). 



Pontogeneia inermis is extremely common at W.Greenland (H.J. 

 Hansen 1887, Vanhoffen, Ortmann 1901) and E. Greenland (Buchholz, 

 H. J. Hansen 1895, Danmark Exped.). It is also found at eastern N. 

 America and W. Norway, whilst its occurrence at Siberia is not certain. 



Halirages fuluocinctus has a similar distribution at Greenland to 

 the foregoing, but it does not seem to be so common at W. Greenland. 



Gammarus locusta ranges from arctic America over Greenland 

 eastwards to Siberia and the Polar Sea (Sars: Crust, in Nansen 

 "Norweg. North Polar Exped.", vol 1, 1900). It is found along the 

 whole western side of Europe and enters the Mediterranean, perhaps 

 into the Black Sea; it has also been taken at the Canary Isles 

 (Chevreux, "Hirondelle" 1900). 



Ampelisca Eschrichtii does not seem to occur S. of the Kattegat. 



Haploops tiibicola goes right into the Baltic and also southwards 

 to France. 



Byblis Gaimardii ranges at least to the Kattegat, possibly into 

 the Mediterranean. 



Podocerus anguipes goes eastwards to the Kattegat. 



Diastylis Rathkei is found in probably all arctic seas; it is a 

 characteristic form both in the Kara Sea and E. of Cape Tscheljuskin 

 (Stuxberg, Bihang .... vol 5, 1880). Southwards it goes to the Gulf 

 of St. Lawrence, Firth of Forth and Belgium. 



Diastylis scorpioides is known from arctic America (Sars 2nd 

 "Fram" Exped.) and is common at W. Greenland from 63°35' N. to 

 71°10' N. (H. J. Hansen 1887); at E. Greenland it has been taken 

 from Hekla Havn (70°27' N.) to ca. 77° N. (H.J.Hansen 1895, Ohlin 

 1901, Danmark Exped.). It is also known from Jan Mayen, Spitz- 

 bergen, Norway N. of Lofoten, White Sea, Nova Zembla, Kara Sea, 

 New Siberian Islands and N. of the mouth of the Jenissei. It is 

 thus almost purely arctic. 



4. Plankton. 



It is not always easy to determine, especially in the case of 

 species which live in deep water, whether they should be considered 

 bottom-forms or as belonging to the plankton ; in cases of doubt they 

 are referred to the former group. To make the summary easier, 

 all the Schizopods are included under the plankton, although several, 

 €. g. Mysis oculata, are true littoral forms or bottom-animals. 



