227 



8. Gitanopsis arctica, G. 0. Sars, n. sp. 



(PL 77, fig. 2). 



Body rather stout, with the back evenly rounded throughout. 

 Cephalon fully as long as the lirst 2 segments of mesosome combined, 

 rostrum evenly curved, and somewhat obtuse at the tip, which reaches about 

 to the end of the basal joint of the superior antennae, lateral corners not at 

 all projecting, and evenly rounded. First pair of coxal plates distinctly 

 visible outside, oblong linguiform and slightly indented at the tip; 2nd pair 

 scarcely expanded in their outer part, distal edge narrowly rounded, and 

 distinctly dentated ; 4th pair not quite twice as deep as the corresponding 

 segment, and transversely truncated at the tip. Last pair of epimeral plates 

 of metasome somewhat produced at the lateral corners, but without any 

 dentiform projection. Eyes rather large, and oval in form, visual elements 

 well-developed. Superior antennse of moderate length, joints of the peduncle 

 successively diminishing in size, flagellum rather slender, half as long again 

 as the peduncle, and composed of about 10 articulations. Inferior antennae 

 considerably longer than the superior, the 2 outer joints of the peduncle nearly 

 equal-sized, flagellum about as long as the peduncle, and composed of about 

 14 articulations. Gnathopoda comparatively feeble, and not very unequal, 

 propodos in both pairs rather small, scarcely broader than the carpus, and 

 gradually widening somewhat, distally, palm distinctly defined and nearly 

 transverse, its edge finely denticulated, and having besides on each side a 

 fascicle of stiff bristles, dactylus of moderate size, minutely spinulose inside, 

 carpal process densely setons, and more projecting on the posterior pair, 

 though not nearly extending to the palm. Pereiopoda of the usual structure, 

 and edged with dense fascicles of short bristles. Last pair of uropoda 

 reaching about as far back as the 1st pair, rami naked, and shorter than 

 the basal part. Telson of moderate size, scarcely projecting beyond the 

 latter, and conically tapering, tip slightly denticulated. Colour in the 

 living state of the animal not yet stated. Length of adult female 5 mm. 



Remarks. The present new species is at once distinguished from 

 the other forms belonging to this genus, by the form of the cephalon, the 

 inferior edges of which are evenly curved, without forming any projecting, 

 corners. Also the structure of the gnathopoda is rather characteristic. 



Occurrence. I found this form, many years ago, rather abundantly 

 in the Varangerfjord at Vads0, but regarded it at that time only as a large 

 variety of Critana Sarsii, to which form it, in fact, bears an unmistakable 

 resemblance, as to the outer habitus. 



