376 



in a comb-like manner. Posterior antennae with the distal joint comparatively 

 short, outer ramus attached near the end of the proximal joint, and fully as long 

 as the distal joint. Mandibular palp with the rami of moderate size and simply 

 setiferous. Posterior maxillipeds rather powerful, hand oval fusiform in shape, 

 with an oblique row of delicate spinules crossing its base. 1st pair of legs with 

 the outer ramus much shorter than the inner, middle joint with a rather strong 

 plumose seta inside, last joint mucb smaller and armed with 3 curved spines and 

 2 somewhat longer setae; inner ramus with the 1st joint rather dilated and carry- 

 ing inside, somewhat beyond the middle, a strong plumose seta, the outer 2 joints 

 well developed and combined nearly attaining the length of the 1st, each with a 

 well-marked seta inside, last joint armed moreover at the tip with 2 unequal 

 claw-like spines and a slender plumose seta. Natatory legs of usual structure, 

 and having both rami coarsely spinulose outside. Last pair of legs each forming 

 an irregular lamella divided in the middle by a deep incision into two rounded 

 setiferous lobes, the outer one provided near the base with a small hair-like 

 bristle and carrying moreover 5 marginal setae, the outer 2 of which are falci- 

 form curved and clothed along the outer edge with coarse spinules; inner lobe 

 a little more prominent and likewise edged with 5 setae, the outer 2 of which 

 are much the longest, whereas the innermost but one is rather short. 



Colour pale yellowish grey. 



Length of adult female 0.74 mm. 



RemarJcs. This form, as above mentioned, was at first described by Th. 

 Scott as a species of the genus Dactylopusia, and was subsequently by the 

 present author referred to the genus Idomene Philippi, to which it undoubtedly 

 bears a near relation. Quite recently, however, Th. Scott has proposed for its 

 reception the new genus Idomenetta, which I believe ought to be supported. 



Occurrence. A solitary female specimen of this form was taken, some 

 years ago, at Ris0r, south coast of Norway, from a depth of about 20 fathoms. 

 Another specimen I found in a sample taken at Aalesund on the west coast. 



Distribution. Scottish coast (Scott), Polar Islands north of Grinnell 

 Land (2nd Fram Exp.). 



Page 136. 

 Amenophia peltata, Boeck. 



Distribution. Polar Island north of Grinnell Land (2nd Fram Exp.). 



