90 AXEL OHLIN, ARCTIC CRUSTACEA. 



Pseudomysis G. O. Särs 1879. 



Among the new and interesting finds with whicli our 

 knowledge abont Arctic crustaceans was enriched by the 

 Norwegian North Atlantic Expedition, is a Schizopod for 

 which Särs has established a new genus. viz. Pscudomysis. 

 Unfortunately he had only two very mntilated specimens, 

 both females, at his disposal, so that his description is, in 

 some respects, incomplete. Dnring the Swedish Arctic Expedition 

 1898 I got a fragment of this remarkable Mysidean from the 

 »Swedish Depth» together with a few specimens of JBoreo- 

 mysis scyphops. As that fragment happens to be the very 

 mntilated pleon of a male, I am here able to complete Särs' 

 description with regard to that important part. 



42. Pseudomysis abyssi G. O. Sars. 



1879. Pseudomysis abyssi G. O. Sars, Crust. et Pycnog, nova etc, 



1. c. p. 430. 

 1885. » » G. O. Sars, Norweg. North Atl. Exp. I, 



p. 50, pl. 5. fig. 13—21. pl. 20, fig. 



18—20. 



Locality: 



in 1898: 



stat. 26. lat. 78° 19' N., long. 8' 41' E., the »Swedish Deptfo, 

 depth 2700 m., bottom temp. — 1,4" C., Bilocuhna clay, 

 25/VII, one spec. (very mutilated pleon of a male). 



Although my fragment of this species is in a very bad 

 conditiou, it evidently proves that this deep-sea Mysidean 

 comes nearest to Boreomysis or Mysideis, as Sars has already, 

 suggested, on account of the structure of the oral parts. 

 The pleopods of the male are developed as two-branched 

 swimming-plates. It is, however, impossible for me to give 

 any exact description or complete figures of them, because 

 they are broken and much mutilated. Contrary to what is 

 usually the case, they all seem to be of about the same size 

 and structure. Even the first pair has the endopodite well 

 developed and is not rudimentary. I have figured the fifth 

 pleopod, which was most complete. The endopodite is here 



