14 AXEL OHLIN, ARCTIC CRUSTAOEA. 



Soutbern form, Nehalia Geoffroyi Milne Edwards,^ cannot fiiid 

 aiiv dilferences at all hetween them except tlie greater size 

 of Nehalia hqws-. On aceount of tliat he believes them to be 

 identical. In that ease its range is still more extensive, as 

 Xehalia Geoffroyi oecurs (m tlie Atlantic coasts of France 

 and Portugal, and also in tlie Mediterranean'. Bnt, besides 

 that, two more interestiiig and surprising localities must be 

 added to this list. 



In 1879, Thomson described a supposed new species from 

 Dunedin Harbour, New Zealand. In 1895, after my return 

 from Tierra del Fuego, I noticed the oceurrence of a Nehalia 

 from Punta Arenas, Straits of Magellan, which I believed, 

 after a mere superficial view, to be identical with our north- 

 ern species, ^ After a closer examination and comparison, this 

 proved to be the case, as I am not able to find any differ- 

 ences. In every detail they agree perfectly. I also consider 

 Thomson's Neljalia longlcornis as identical. His short descrip- 

 tion is based only upon one specimen. certainly a male (thence 

 the specific name), and it is tolerably good, except with re- 

 gard to the peduncle of the superior pair of antennse, which, 

 he says, consists only of two ^ joints. Even in the most ab- 

 errant species of this family, Faranebalia longipes and Neljcdi- 

 opsis typica, described by Särs in the Challenger Reports, 

 the peduncle is four-jointed. 



This case of bipolarity in a family whose few members, 

 without doubt, must be regarded as the only surviving re- 

 presentatives of a very generalized type of great antiquity,. 

 is of the utmost interest as increasing the number of facts 

 already collected as to the solution of the great question, if 

 the Antarctic is to be regarded as the birthplace of most of 

 the forms now occurring even in the seas close to the North 

 Pole itself. 



Colour of living specimens (from Spitzbergen) whitish 

 with a light-red tint, eyes cochineal. 



Length (incl. the caudal appendages) . . 18,5 mm., 

 heighth of carapace 5 



^ MiLNE Edwards. Hist. Nat. des Crust. Vol. 3. p. 355. 

 2 Ohlin, Öfvers. af Kongl. Vet. Akad. FörhandL 1896. n:o G p. 489. also: 

 Natural Science. Vol. 9. n:o 55. 1896. p. 176. 



^ Rather three, if we include >the short, triangulär joint> in the peduncle. 



