14 



spots, intt'stiiie dui'k bluisli. Leiigtli of adult specimens 4;") miu. Maxiimim 

 lenf^tli of arctic specimens, according to Bovallins, 60 mm. 



licnuirhs. — This gigantic species is easily distinguished fnnu the 

 two otlier uortlieni forms by the ronuded, not carinated, back, the very slender 

 urosome, and b}- the dactyli of the pereiojjoda, especially tliose of the 3d 

 pair, being densely spinulons at the base. In all these points the form named 

 by Bovallins E. Nordenslrjdldi agrees with the present species, from which it 

 can hardly be specifically distinguished. 



Occttrrence. — Occasionally this form may he found in large shoals at the 

 noi'tli and east coast of Finmai-k, swimming near tlie surface of the sea; but 

 generallj- only j'onng specimens are met with. The figure here given is from 

 a specimen procurcil on the Norwegian North Atlantic Expedition. 



Dis/i-iJiii/inn. — Arctic Ocean, wiiU-ly distributed: (Treenland, Spits- 

 liergen, Jan Mayen, Novaja Semlja, Siberian I'olar Sea, numerons stations 

 of the Norwegian North-Atlantic Expedition, Itolli in dee[i water and at the 

 surface of the sea. 



7. Euthemisto bispinosa, (B"C'<k) 



(I'l. ti, %. 2). 

 Themisto bispinosa, Bocrk, Crust. Aniphip. borealiri ft arotioa, p. 8. 



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

 the mesosome forming distinct retro vergent dorsal processes. Cephalon nearly 

 twice as deep as long, obtiisel}' truncated in front ; eye-pigment rather narrow, 

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

 flagellum minutely denticulated on the posterior edge and having the extremity 

 distinctly curved. i^osterior gnatho[)oda 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 

 tajx'ring in the outer part and fringed ^^4th comparative!}' slioii and une(|ual 

 In'istles. Third pair of pereiopoda exceedinglj- elongate and slender, basal 

 joint less expanded than in E. Jihillnhi. [)ropodal joint very narrow, much 

 longer tlian tlie carpal joint and i[uite straight, anterior edge with only a 

 few small setie in tlie middle, outer part regularly pectinate, the spinules 

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

 small an<l unarmed. Last pair of uropoda about twice the length of the 

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

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

 ])igmentary spots, especially on the posterior division. Length of adult 



