23 



Outer ramus of 2nd to 4th pairs of legs provided with scarcely any spinules on 

 the hind face, apical spine exceedingly slender, exceeding the length of the ter- 

 minal joint. Length of adult female 1.60 mm. 



Remarks. As stated above, this species was first described by the present 

 author from Nansen's Polar Expedition. It is closely allied to the type species, 

 8. abyssalis Giesbrecht, but is apparently distinct, the spiny armature of the legs 

 and maxillipeds being, to judge from the figures given by Dr. Giesbrecht, much 

 coarser in the latter species. 



Occurrence. I have not myself ever observed this form off the coast of 

 Norway; but Mr. 0. Nordgaard has recently found it in the Osterfjord near 

 Bergen at the considerable depth of from 400 to 600 meters, together with other 

 relict arctic forms. The figures here given are from a well-preserved female 

 specimen kindly sent to me by that naturalist. 



Distribution. The Polar Sea in about the 80th degree of latitude, at 2 

 different Stations. 



Fam. 5. ^Ctideidae. 



Characters. Body, as a rule, not very slender, the anterior division being 

 more or less tumefied. Cephalosome coalesced with the 1st segment of metasome, 

 front generally projecting below into a highly chitinised bifid or simple mucronate 

 rostrum, more rarely quite unarmed. Last segment of metasome united with the 

 preceding one, and generally having the lateral corners produced behind. Urosome 

 in female 4-articulate, in male, as usual, 5-articulate and very narrow, with the 

 anal segment much shortened. Caudal rami generally short, with only 4 of the 

 marginal setse distinctly developed, in male mobile as in the preceding families. 

 Eye generally well developed, though in some cases wholly absent. Anterior 

 antennaB in female of moderate length, or comparatively short, with the 8th and 

 9th articulations confluent; those in male transformed in a manner similar to 

 those in the Pseudocalanidce, though having the sensory appendages more densely 

 crowded together on the proximal part, and very long and band-like. Posterior 

 antenna with the outer ramus generally longer than the inner. Oral parts in female 

 on the whole normal; posterior maxillipeds, however, with the terminal part reflexed. 

 Oral parts in male considerably reduced. Legs of a structure similar to that in 

 the Pseudocalanidce, though considerably more strongly built. Last pair of legs 

 always wanting in female, in male generally rather simple in structure. 



