9 



vallius enumerates 5 species of the present genus; hut I regard tin- validity 

 of some of these species rather doubtful. Thus 1 believe that only a single 

 species is represented in the northern seas, instead of .'>. as surest e< I by 

 that author. 



3. Hyperoche Kroyeri, Bovallius. 



(PI. 4). 



Metoecus mediisarnn/., Kroyer, Gronlands Ainphipoder. DaiiHke VM. Sdsk. Af'liamll. 



VII, p. 2SH, pi. ;}, lig. 15. 



Syn : Tdiirin abyssorum, Boeck. 

 Hi/perodtr Liltkeni, Bovall. 



Body of female short and tumid, of male much more slender and 

 compressed. Cephalon rounded in front, eye-pigment triangular. Mesosome 

 with the back rather vaulted; metasome comparatively slender, with the 

 epimeral plates not very large in female. Griiathopoda almost naked, carpal 

 process of both pairs in female advancing beyond the propodal joint, in male 

 somewhat shorter and narrower. Carpal joint of the 2 anterior pairs ol 

 pereiopoda having the posterior edge sharpened and minutely denticulated, 

 terminating with a short triangular process; the 3 posterior pairs comparatively 

 short and almost quite naked, with the basal joint rather narrow. Last pair 

 of uropoda with the basal part about twice the length of the telson, in male 

 rather broader than in female. Colour of female light reddish brown, of male 

 more greyish, from numerous dark pigmentary spots. Usual length 50 mm. 

 Maximum length of arctic specimens 15 mm. 



licnxirfo. I believe that Dr. Bovallius is right in rejecting the 

 specific name iHrdtwinini, applied to this species by Kroyer, since the form 

 designated by 0. Fabricius as 0>ii*cu* iwditxarttiu in all probability was 

 a true Hyperia and most likely the species described above as Ht/i>fri<i nic- 

 dnsantm. On the other hand I cannot coincide with that author in regarding 

 Kroyer's species distinct from Tauria altj^ornni of Boeck. Nor can 1 doubt that 

 Dr. Hansen is right in withdrawing the species established by the same 

 author under the name of Hyp&roche Lufkeni, as synonymous with the typical 

 species described by Kroyer. 



Occurrence. I have met with this form both off the south and west- 

 coasts of Norway up to Lofoten, at times near the surface of the sea, at times 

 in greater depths, but always free, not parasitic. No doubt, however, that it 

 in reality leads a parasitic life on Medusae or some other pelagic animals, as 

 with the species of Hyperia. 



Distribution. - Arctic Ocean: Greenland, Labrador, Spitsbergen, the 



White Sea, the Siberian Polar Sea, 







