22 



Mindeskrift for J. Steenstrup. XXX. 



Further, during the "Tjalfe" Expedition 15 specimens were taken at the following 

 piaces : 



St. 650. Nuk in Ilua Fjord. 120—180 fm. 18. 9. 1909. Line. 1 spec. c?. 560 mm. 

 St. 152. Kekertak in Torsukatak Isfjord. 100—160 fm. ca. 0—0.5° C. 24. 7. 1908. 



Line. 1 spec. c?. 430 mm to end of App. genitales (end of tail wanting). 

 St. 159. Umanakfjord (70°49' N., 53°16' W.). 260 fm. 1.1° C. 30. 7. 1908. Trawl. 1 



spec. c?. 390 mm. 

 St. 161. Umanakfjord S.W. of Spragle Bugt. 140— 320 fm. ca. 0.2— 1.0° C. 31. 7. 1908. 



Line. 1 spec. ?. 678 mm. 

 St. 176. Umanakfjord (70°52'N., 53°6'W.). 260 fm. 1.1° G. 7.8.1908. Trawl. 11 



spec. 167— 292 mm. 



From West Greenland, 

 therefore, the species is re- 

 presented in the Gopenha- 

 gen Zoologicai Museum by 

 17 specimens, in size from 

 167—678 mm. The follow- 

 ing information regarding 

 these may be added. 



The snout forms a 

 sharp angle. The anterior 

 margins of the disc form a 

 slight curve or bend imme- 

 diately behind the snout; a second in-curving begins behind the spiracles and the 

 anterior margins thus have a wavy appearance. The point of the .pectorals forms 

 almost a right angle, rounded at the end. But the contour undergoes some change 

 with age; the snout becomes drawn out into a longer and more distinct point, and the 

 incurving in the lateral margin behind the eyes becomes deeper, so that the regular, 

 rhombic form of the young individuals changes and the pectoral fms become marked 

 olf from the front part of the disc like "wings". 



The large spines in the mid line of the back and tail, at the eyes and over the shoulder 

 are grooved from the base outwards towards the point, which is sharp and bent some- 

 what backwards; on the tail they are fairly high and compressed. The other spines 

 are stellate, of medium size or quite small. The medium spines are found over the front 

 part of the snout cartilage; on the lateral margins of the disc opposite the eyes; on an 

 area beginning opposite the shoulder spines and extending backwards to the posterior 

 margin of the pectoral fms; on both sides of the middle row of the back, but not quite 



Fig. 5. Dentition of Raja hyperborea d, aatural size ; the separate 



teeth magnified 3 diameters. From a specimen from the Norwegian 



Sea (62°40'N. 1°56'E.), 360 fm. 



