372 Di'- A.. Ohlin on a 



obtained at Station 29 of the expedition of 1900, between 

 East Greenland and Jan Mayen, lat. 72° 42' N., lonn-. 14° 49' 

 W.; depth 2000 m. ; Olohigerina-oozQ \ August 27, 1900. 



The specimen which was first recorded by Willemoes Suhm 

 as a new species, and h\ter on described by Sars, was taken off 

 the Crozet Islands, lat. 46° 16' S., long. 48° 27' E. ; depth 

 1600 fathoms ; diatom-ooze. 



In even the slightest details my examples agree so perfectly 

 with Sars's specimen, that I cannot hesitate for a moment to 

 identify them. As the cases of bipolarity must be regarded 

 as the most interesting points in marine zoogeography of 

 the present day, I thought it appropriate at once to commu- 

 nicate the present instance. 



In his paper " On the Deep- and Shallow-water Marine 

 Fauna of the Kerguelen Region of the Great Southern 

 Ocean"* Sir John Murray enumerates nearly one hundred 

 species belonging to different classes of animals which are 

 supposed to be identical, and occurring both in the Arctic and 

 Antarctic Oceans, but not in the tropical seas. 



In a critical revision of the forms quoted by Murray, 

 Professor d'Arcy W. Thompson, in a paper " On a supposed 

 Resemblance between the Marine Faunas of the Arctic and 

 Antarctic Regions " fj comes to the conclusion that in regard 

 to more than one third of the species mentioned by jMurray 

 " grave doubt as to their identiticution was expressed by tiie 

 original describers. ... In somewhat more than another 

 third the evidence of identity is inconclusive or even inad- 

 missible. ... 



*' Of the remaining forms, about a dozen find xheir northern 

 representatives in the Japanese seas, where they form part of 

 a fauna predominantly southern in its relations. . . . 



"... the remnant of equal number that are quoted as 

 occurring in the North Atlantic as well as in or near the 

 Southern Ocean are, for the most part, deep-water species." 



This remnant of the long original list of bipolar animals, 

 as to the occurrence of which in both hemispheres no doubt 

 can exist, comprises the following species : — 



? Harpacticus fulvuSy Fischer (brackish). 

 Terebellides Stromit, M. Sars. 



Jantidna rotundata, Leach. 

 Calanus Jinmarchicus, Gunnerus. 



* Traus. Hoy. Soc. Ediub. xxxviii. l8'Jo. 

 + Proc. Roy. Soc. Edinb. 1898. 



