38 



Mindeskrift for J. Steenstrup. XXX. 



Atlantic water flowing over the ridge). And just here in the northerri basin Raja 

 hyperboréa has its home, the species that is only found north of the corresponding 

 submarine ridge between Greenland and Europe. 



80 



80 



70 



80 



70 



60 XjO 40 30 20 10 O 10 20 j^X 40" 



50 



• Raja hyperboréa. 



c/' Raja spinicauda 



ARajaFyllæ. TRajalinfea. 



X Cenrroscyllium Fabricii. 



Fig. 12. Chart illustrating the distribution of the above-named Selachians in the seas between 

 Europe -Greenland -America. The dotted line indicates the limit between bottom-water with 



degrees above and below zero. 



But in addition to this northern occurrence at West Greenland Raja hyperboréa 

 has still another, namely in a fjord at the southernmost point of Greenland (at Nuk 

 inside Ilua). This however is easily explained, since at the bottom of several deep 

 fjords of West Greenland there is a water-layer with constant temperatures about 

 0°C., almost as in Baffms Bay. The fjord referred to is undoubtedly of this nature; 



