200 

 2. Stegocephalus similis, G. 0. Sars, n. sp. 



(PI. 70. fig. 1). 



In general ajipearaiice rather like the preceding species, thongh 

 perhaps not fully s.o rolmst of form. Cephalon forming in fiont a very short 

 and obtuse rostral projection, lateral corners but little projecting, and rounded 

 at the tip. First segment of mesosome fully as long as the 2 succeeding 

 ones combined. Fourth pair of coxal plates considerably smaller than in the 

 type species, much less than twice as deep as the corresponding segment, and not 

 attaining tlie breadth of the 3 succeeding pairs combined, posterior expansion 

 leather narrow, scarcely encompassing the 5th pair fully inferiorly, distal 

 edge forming a very slight and quite even curve. Last pair of epimeral 

 plates of metasome not produced at the lateral corners, posterior edge slighth' 

 arcuate and coarsely serrated, inferior edge quite smooth. Superior antennte of 

 much the same structure as in the preceding species, but having the flagellum 

 comparativel}' shorter, and only composed of 9 articulations, the Lst of which 

 is considerablj' larger than the others, especially in the male. Inferior antennae 

 scarcely longer than the superior, the last 2 joints of the peduncle nearly equal- 

 sized, flagellum about tlie length of those joints combined. Anterior gnathopoda 

 comparatively somewhat more robust than in St. mflafus, the carpus being 

 rather dilated, about as broad as it is long, and shorter than the propodos. 

 Posterior gnathopoda about as in that species. Basal joint of the 2 last 

 pair of pereiopoda subsimilar in form, regularly oval, with the infero-posterior 

 corner evenly rounded off", that of last pair, as usual, the larger. Uropoda 

 nearly as in St. inflidiis. Telson comparatively broader, with tlie oirter part 

 less attenuated, cleft extending beyond the middle. Body light straw- 

 coloured, everj'-where mottled with bro\\ni and reddish pigmentary spots, 

 which, however, do not form any distinctly defined patches. Length of adult 

 female 12 mm. 



BcmarJiS. — Though very like the preceding form in its general 

 appearance, this new species is, on closer inspection, at once distinguished by 

 several well-marked characteristics; thus, by the very short rostral projection, 

 the considerably smaller size of the 4th pair of coxal plates, the regular oval 

 form of the basal joint of the 2 last pairs of pereiopoda, and finally, by the 

 not produced last pair of epimeral plates of metasome, and their very different 

 armature. 



Occurrence. — It is only recently that I have been aware of tliis 

 species, several specimens of which were collected by me, long ago, off the 

 west coast of Norway, but at that time confounded with St. inflafus. In 

 later 3^ears I have observed it off the Nordland coast, at Tjote, and in the 



