spots, intestine dark bluish. Length of adult specimens 45 mm. Maximum 

 length of arctic specimens, according to Bovallins, 60 mm. 



Urinal'/,-*. This gigantic species is easily distinguished from the 

 two other northern forms by the rounded, not carinated, back, the very slender 

 urosome, and by the dactyli of the pereiopoda, especially those of the 3d 

 I air, being densely spinulous at the base. In all these points the form named 

 by Bovallius E. Nordenskjoldi agrees with the present species, from which it 

 ran hardly be specifically distinguished. 



Occurrence. - - Occasionally this form may be found in large shoals at the 

 north and east coast of Finmark, swimming near the surface of the sea; but 

 generally only young specimens are met with. The figure here given is from 

 a specimen procured on the Norwegian North Atlantic Expedition. 



Distribution. Arctic Ocean, widely distributed: Greenland, Spits- 

 bergen, Jan Mayeu, Novaja Semlja, Siberian Polar Sea, numerous stations 

 of the Norwegian North-Atlantic Expedition, both in deep water and at the 

 surface of the sea, 



7. Euthemisto bispinosa, (Boeck). 



(PI. 6, fig. 2). 

 Themisto bispinosa, Boeok, Crust. Amphip. borealia et arctica, p. 8. 



Body rather slender, with the back carinated, the 2 last segments of 

 the mesosome forming distinct retrovergent dorsal processes. Cephalon nearly 

 twice as deep as long, obtusely truncated in front ; eye-pigment rather narrow, 

 almost crescent-like. Superior antennae scarcely longer than the cephalon, 

 fiagellum minutely denticulated on the posterior edge and having the extremity 

 distinctly curved. Posterior gnathopoda with the carpal process not nearly 

 reaching the tip of the propodal joint; dactylus comparatively small. Carpal 

 joint of the 2 anterior pairs of pereiopoda irregularly ovate, somewhat 

 tapering in the outer part and fringed with comparatively short and unequal 

 bristles. Third pair of pereiopoda exceedingly elongate and slender, basal 

 joint less expanded than in E. UMlnJa, propodal joint very narrow, much 

 longer than the carpal joint and quite straight, anterior edge with only a 

 few small setfP in the middle, outer part regularly pectinate, the spinules 

 gradually increasing in length towards the tip of the joint; dactylus very 

 small and unarmed. Last pair of uropoda about twiee the length of the 

 urosome, outer ramus much smaller than inner. Telson rather small. Body 

 pellucid, with dark purplish intestine, and ornamented with scattered stellate 

 pigmentary spots, especially on the posterior division. Length of adult 



