26 



Mindeskrift for J. Steenstrup. XXX. 



Locality : 



Depth Number of capsules Length of capsules 



Disko Bay 1 



Jakobshavn 5 



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



— (70°49'N., 53^16' W.) .. 260 — 1 



— (70°52' N., 53°6' W.) ... 260 — 2 

 Proven 



110 & 110 mm 



81, 103, 110, 110, lirjmm 



87, 95 mm 



1091) 



85, 90 



1 (dried) 



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

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



a h c d 



Fig. 7. Pieces of dried egg-eases of lia]a raduita (n, b and <■) and li. hypeihoreit [d] inagnilied G 

 diameters to show the different struetnre of the capside-wall. 



considerably larger in tlic former than in the latter species : in 1 4 specimens of R. h/jpcrborea 

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



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

 yohc-sac. The total length of the embryo is 140 mm; beliind the 2nd dorsal fln is a tail-end 35 mm 

 long, thus quite as long as in the embryo of R. radiala (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 taf;en by Vanhoffen from a specimen of R. hyperborea from Jakobshavn 

 (erroneously described by tliis author 1. c. p. 128 as belonging to H. 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 lioth species may be added here. 



Length of capsule 

 without threads 



Ra}a hyperborea 



Raja radiata 



125 mm 



115 ^ 



109 — 



103 — 



81 - 



68 — 



(5(5 — 



62 - 



57 - 



56 - 



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-fine parts of the threads were 

 thus preserved. 



