Ad. s. Jensen: The Selachians of Greenland. 27 



Further, the structure of the covering is different somewhat, being smoother in R. 

 hyperborea (fig. 7d) than in R. radiata (fig. 7a, b, c), where the capsule is rather rough 

 and imeven, frequently wrinkled trans versely ^). 



Remains of small fishes and Crustacea (prawTis) were found in the stomach of Raja 

 hyperborea. 



General Distribution. Raja hyperborea is distributed in addition over the 

 "cold area" north of Russia and from Norway over towards East Greenland and 

 from Spitzbergen down towards the Shetlands, Færoes and Iceland. It was here, in 

 the depths of the Norwegian Sea, taken at depths of down to 1309 fm., and upwards 

 the boundary for its distribution falls at the boundary layer between the cold polar 

 water and the overlying warm Gulf Stream water, thus at ca. 300 fm. It is also taken 

 in the "cold area" North of Russia. (cf. besides pp. 37 — 38 and the chart, fig. 12). 



Raja fyllae Liitken. 



Raja fyllae Lutken, Vidensk. Medd. Naturhist. Foren., 1887, p. 1, tab. 1 ; Lutken, ibid., 1891, 

 p. 32; The Danish Ingolf-Expedition, II, 1, 1898, p. 11, tab. 2; Jensen, Vidensk. Medd. Natur- 

 hist. Foren. 1905, p. 227. — Raja circularis Collett (non Couch), Nyt Mag. for Naturvidensk., 

 29, 1885, p. 119. — Raja falsavela Smitt (non Bonaparte), Skandinaviens Fiskar, II, p. 1112, 

 fig. 319. 



West Greenland. Four specimens of this small ray were caught in the Davis Strait 

 The type-specimen of the species was taken on the cruise of the cruiser "Fylla" in 

 1884; according to the record it was taken at 65°35' N., 54°50' W. and a depth of 75 fm., 

 but the comparatively slight depth would indicate, that an error has taken place and 

 that the specimen comes from another, neighbouring trawl-station in considerably deeper 

 water (256 fm.). 



Later the species has been taken at the following, certain stations: 



63°30' N., 54°25' W. 582 fm. 3.3° G. "Ingolf" 1895. Adult male, length 555 mm 

 65°30' N., 55°26' W. 289 fm. 4.5° C. "Fylla" 1889. Young male, length 115 mm 

 66°49' N., 56°28' W. 235 fm. 4.4° C. "Fylla" 1889. Young male, length 201 mm 



At the above-cited piaces Lutken has discussed in detail the structure of this ray 

 and the changes its form undergoes with age. 



General Distribution, In addition to the Davis Strait Raja fyllae has been 



taken in the southern part of Denmark Strait, S.W. of the Færoes, in the Skagerak, 



') The Qg^ of Raja hyperborea, of which I also have 2 specimens, 108 and 123 mm long, 66 

 and 71 mm broad, from the Norwegian Basin (64°58'N., 11° 12' W., 300 fm., bottom-temp. — 

 0.38° C), was hitherto unknown. H. C. Williamson has recently given an instructive, iUustrated 

 account of a number of the egg-cases of other European skates, in "Fisheries, Scotland, Sci. In- 

 vest., 1912, I" (July 1913). 



4* 



