573 



flagellum about the length of the last 2 peduncular joints combined, and 

 likewise composed of 5 articulations. Gnathopoda in female not very strong, 

 the anterior ones with the carpus rather elongated, and but slightly expanded 

 below, propodos about same length, and oblong oval in form, with the palm 

 imperfectly denned below. Posterior gnathopoda, as usual, somewhat stronger 

 than the anterior, with the carpus rather short, and produced below to a 

 narrow setiferous lobe, propodos oval triangular in form, with the palm rather 

 oblique, and denned below by an obtuse angle. Both pairs of gnathopoda in 

 male, but especially the posterior ones, much stronger than in female, propodos 

 of the anterior ones having the palm deeply excavated in the middle, and 

 defined below by a projecting angle, that of the posterior ones extremely 

 large, being greatly expanded in its proximal part, and rapidly tapering 

 distally, palm much longer than the hind margin, and defined below by a 

 strongly projecting triangular lobe, its edge minutely crenulated and Insinuate, 

 with 2 angular projections, dactylus rather strong and, when closed, impinging 

 within the posterior sinus of the palm. Pereiopoda rather slender, and some- 

 what resembling those in P. longicaudata; last pair, however, less elongated, 

 not nearly extending to the end of the body. Last pair of uropoda nearly the 

 same as in that species. Telson extremely small, being nearly twice as broad 

 as it is long, and having, as usual, on either side at the tip a small nodiform 

 projection. Body whitish grey, with a very slight trace of a somewhat 

 darker pigment on the coxal plates. Length of adult female scarcely attain- 

 ing 4 mm, of male about the same. 



Remarks. The present species is easily distinguishable from both 



the preceding ones by the short and stout body, the comparatively very 

 large coxal plates, the very thin and sparsely setous antennae, and by the 

 structure of the gnathopoda, especially those in the male. It is also much 

 inferior in size. 



Occurrence. I first detected this form in the Varangerfjord, where 

 it occurred rather abundantly in a depth of 3040 fathoms. Subsequently 

 I have also met with it in a few other places on the Finmark coast, and 

 southwards to Bronosund on the Nordland coast. 



Distribution. Greenland (Hansen), British Isles (Waller). 



76 Crustacea. 



