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Viillius emiiuerates 5 species of tlic i)i-e.seiit ft-eiius; Imt I ri'i;-ai'(l the validity 

 (if senile (if flu'se species ratlier dmilitful. Tims 1 believe that (inly a single 

 species is represented in the northern seas, instead of 3, as suggested by 

 that author. 



3. Hyperoche Krbyeri, Bovallins. 



(I'l I) 



Metoecus medusrinim , Kroyer, Gronlands Ainphipoder. DaiisUi^ \'iil. Sclsk. Afluiiull. 



VII, p, 288, pi. 3, fig. 16. 



Syn: Tanria abyssorum, Boeck. 

 » Hi/pertichc Lutkcni, Bovall. 



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

 compressed. Cejihalon rounded in front, eye-pigmeut triangular. Mesosome 

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

 epimeral plates not very large in female. G-nathopoda almost naked, carjial 

 process of lioth jiairs in female advancing beyond the ]iro])odal joint, in male 

 somewhat shorter and narrower. Carpal joint of the 2 anterior ])airs of 

 pereiopoda having the posterior edge sharpened and minutely denticulated, 

 terminating with a short ti'iangular process ; the 3 jjosterior pairs com])a-ratively 

 short and almost ([uite naked, with the basal joint ratlier narrow. Ivast ])air 

 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 dai'k pigmentary spots. Usual length 5 — G \n\\\. 

 Maximum length of arctic specimens 15 mm. 



BemarJcs. — I believe that Dr. BovalHus is right in I'ejecting the 

 s])ecitic name iiiedmarum apjilied to this species liy Kroyer, since tlie foi'in 

 designated by O. Fabricius as Oni.scus mcdunarum in all jirobability was 

 a true Hyperia and most likely the species described above as Hi/prria ms- 

 (J/isd.rniiL On the other hand I cannot coincide with that author in regarding 

 Ivroyer's species distinct from Tiinria ahijsniorKM of Boeck. Noi' can 1 doulit that 

 Dr. Hansen is right in withdrawing the species established l)y the same 

 author under the name of Hijprroche Liiflccni, as synonymous with the tyjiical 

 species described by Kroyer. 



Occurrence. — I have met with this form lioth off the south and we.st 

 coasts of Norway u]) to Lofoten, at times near the surface of the sea, at times 

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

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

 with the s])ecies of Hyperia. 



Dislrihnh'ou. — Arctic Ocean: (ireeuland, Labrador, S|iitsbergcn, the 

 White Sea, the Siberian Bedar Sea. 



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