Ad. S. Jensen: The Selachians of Greenland. 



25 



In addition, I was able to determine, that Vanhoffen's North Greenland rays 

 agree in every respect with Raja hyperborea. By comparison with the Greenland speci- 

 mens of our Museum only the specimen from Jakobshavn differed somewhat, the white 

 colour on the belly had a comparatively large extension, but in this regard it is exceeded 

 by specimens from other seas (depths (if the Norwegian Sea), in which the while ground- 

 colour of the under surface is just as widely distributed as nr greater than the ihirk 

 colour. 



For the sake of completeness if may fnrlhcr lie menlioned, that Pietschmann aiotes 

 casually, that the Vienna Museum possesses two specimens of Raja hijperborea from 

 '"North-west Greenland"^). 



Thus from West Greenland we know 23 specimens of Raja hijpcrborra. Of these 

 22 have been taken on the stretch from Jakobshavn to Upernivik, at the following jilaces: 

 Jakobshavn, Kekertak, Umanak Fjord (various places from Ikerasak to Igdiorsuit) 

 and Upernivik. The 

 species must there- 

 fore be considered to 

 be common in deep 

 water at Danish 



North Greenland, 

 from tiie northern 

 end of Disko Bay 

 and northwards^). On 

 the other hand, a 

 single specimen has 

 been taken right 

 down in the sounds at the south of Greenland, al Nuk in llua Fjord (60°12' N.). 



At the northern Danish West Greenland a number of egg-capsules of Raja hyper- 

 borea have also been taken^) (cf. lig. 6). The data fif the localities are given here, 

 with information regarding the length of the capsules (in th(> middle, thus without 

 the threads): 



Fig. 6. Egg-case of Raja hyperborea, reduced ('/a), from Jakobshavn. The 



longitudinal striation indicates the layer of golden, silk-like hairs in wliich 



the capsule is enveloped. 



') V. Pietschmann: Ichthyologische Ergebnisse einer Reise ins Barentsnieer ; Annalen des 

 K. K. Naturhist. Hofmuseunis, Bd. 22, Nr. 4, 1907- US (p. 296). 



-■) It has been sliown under Raja radiata, that this so common species at South Greenland 

 has not been found farther north than in Disko Bay at 69°17' N. As the southernmost locality 

 tor Raja hyperborea, Jakobshavn, lies in Disko Bay at G9°13'N , it seems as if these two common 

 Greenland species of rays each inhabits its own part of tlie west coast and only toucli each other's 

 region of distribution in Disko Bay (as also right down at llua Fjord at the turning point to 

 East Greenland, where R. hyperborea again reappears). 



") Some have been taken from the stomachs of other fishes (Greenland Shark), which had 

 swallowed them, others were taken up from the sea-bottom by the trawl of the "Tjalfe". 



4 



