26 Mindeskrift for J.Steenstrup. XXX. 



Locality: Depth Number of capsules Length of capsules 



Disko Bay 1 110 & 110 mm 



Jakobshavn 5 81, 103, 110, 110, 115 mm 



Umanakfjord(70°47'.5N., 52°21'W.). 311 fm. 2 87, 95 mm 



— (70°49' N., 53°16' W.) . . 260 — 1 lOQi) 



— (70°52' N., 53°6' W.) • • • 260 — 2 85, 90 

 Prøven 1 (dried) ? 



It may be added here, that the egg-capsules of Raja hyperborea and R. radiata have 

 a great resemblance to each other. So far as my experience goes however, the capsule is 



ab cd 



Fig. 7. Pieces of dried egg-cases of Raja radiata («, b and c) and R. hyperborea (d) magnified G 

 diameters to show the dilTerent structure of the capsule -wall. 



considerably larger in the former than in the latter species ; in 14 specimens of R. hyperborea 

 it varies from 81 — 125 mm^), in 29 specimens of R. radiata from 44 — 68 mm (cf. p. 19)^), 



>) This egg, which was taken in the trawl on 30. 7. 1908, contains an embryo with fairly large 

 yolk-sac. The total length of the embryo is 140 mm; behind the 2nd dorsal fm is a tail-end 35 mm 

 long, thus quite as long as in the embryo of R. radiata (cf. p. 17, note 2). 



'^) In addition to the above-mentioned I have been able to examine another, 125 mm long, 

 egg-capsule, which was taken by Vanhoffen from a specimen of jR. hyperborea from Jakobshavn 

 (erroneously described by this author 1. c. p. 128 as belonging to R. radiata). With the aid of this 

 egg, which had been kindly lent to me by the Berlin Museum, I was able to identify the other 

 eggs of R. hyperborea with absolute certainty. 



*) As a supplement some further measurements of egg-capsules of both species may be added here. 



The relatively great total length of the two R. radiata egg-capsules first-mentioned is due to 

 their having been taken from the uterus and the outermost, hair-fme parts of the threads were 

 thus preserved. 



