BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 20. AFD. IV. N:0 12. 39 



Fam. Dajidae. 



Dajus Kröyer 1846. 

 Leptophryxus Buchholz. 



Dajus mysidis KrÖYER. 



1846. Dajus mysidis Kröyer, Voy. en Scaud. etc, pl. 28, figs. 1 A — B. 

 1874. Leptophryxus Mysidis BucHHOLZ, Zweite deutsche Nordpolart'. 



1. c, p. 288, tab. 2, tigs. 2 a— g, 

 1898. Dajus mysidis G. O. Särs, Isopoda, p. 223, pls. 93, 94. 



In the collection made by Mr. Th. Wulff, B. A., in the 

 summer of 1899 with the Swedish-Russian Expedition for 

 measuring latitudes, I found this species in several speci- 

 niens in diiFerent stages of development on Mysis oculata 

 (O. Fabricius) from Danes Gat, North Spitzbergen, depth 

 20—30 m., 7 VII. From Nathorst's Arctic Expeditions I did 

 not obtain this parasite; but as I have not yet gone throngh 

 the Bccapoda and Schizopoda, it may be possible that this 

 and other Epicarids will be found on a låter examination. 



Dajus mysidis seems to be a true Arctic and circumpolar 

 species. Thus it has been obtained at the following places, viz., 

 BafRn Land (Ohlin), Labrador (Packard), North Greenland (Oh- 

 lin), West Greenland (Kröyer (?), Hansen, Ohlin), East Green- 

 land (Buchholz), Jan May en (Särs), Spitzbergen (Kröyer (?), 

 Hoek), Finmarken and North Land, Norway (Särs), Murman 

 coast (Stuxberg), the Kära Sea (Hansen), New Siberian Is- 

 lands (Särs ^). 



Greatest length of female 4,3 mm. 



» CriTStacea, Xorw. North Pol. Exp. 1893—96. 



