13 



N. 



llcmurlc*. Boeek lias referred tliis form to the genus r<irtlirinixl(i, 

 because in the figure given by does tlie 3 posterior pairs of pereiopoda art- 

 represented as being of uniform length. In reality, however, Ihe.'Jd pair are, 

 at least in full-grown specimens, distinctly longer than the ~2 succeeding 

 ones, although the difference in this species is not nearly so great as in the 

 2 succeeding species. Moreover the powerful structure of the ~2 anterior 

 pairs of pereiopoda, as also the mutual length of the antenna', shows this t'orm 

 to be a true Eiifhrwixfo. As to the form named by Dr. IJovallins /'. hixjiiin^u 

 Boeck, at least the habitus-figure given would seem more proper! \ to relate 

 to the present than to Boeck's species. 



Occurrence. - - Off the coast of Norway I have only observed this 

 form in a single locality, viz., at Hasvig in west Finmark. It occurred 

 here rather sparingly in deep water together with Parathemisto nfilirin. 



Distribution. - Arctic Ocean: Davis strait, east coast of Greenland. 

 Jan Mayen at Stat. 225 of the Norwegian North Atlantic Expedition. 



(3. Euthemisto libellula, (Mandt). 



(PI. 6, fig. 1). 



ruN HMlnla, Mandt, Observaliones in Historiam natnralem et Anatoniiain 

 comparatam in itinere gr0nlandico fuotre, p. 32. 

 Syn: Tlicmisto arctlca, Kr0yer. 



Body very slender, with the back rounded, not carinated. (Vphalon 

 scarcely more deep than long, obliquely rounded in front; eye-pigment rather 

 large, obliquely oval. Superior antennae with the nagellum scarcely curved. 

 Gnathopoda having the propodal joint shorter than the carpal one, carpal 

 process of the 2nd pair nearly reaching the tip of the propodal joint, dactylus 

 very small. Carpal joint of the 2 anterior pairs of pereiopoda broadly ovate, 

 slightly expanded towards the extremity and provided, on the posterior edge. 

 with a regular series of rather elongated setae. Third pair of pereiopoda very 

 elongated, basal joint expanded, with the -anterior edge bulging out on 1 1n- 

 middle and provided with short bristles, propodal joint about the length of 

 the carpal, anterior edge with a regular series of rather strong setae placed 

 at regular intervals and increasing in length towards the extremity, .niter 

 part of the edge densely spinulous, dactylus slightly tlexuous, with a dense 

 tuft of fine spinules at the base. Urosome very slender, about half the 

 length of the metasome. Uropoda likewise very slender, rami of the la<1 pair 

 subequal in length. Body densely ornamented with dark purplish pigmentary 



