Page 94. 



Idycea gracilis, Scott. 

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





Page 96. 



finmarchica, G. 0. Sars. 

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



Page 97. 

 Add the following species: 



Idyasa tenella, G. 0. Sars, n. sp. 



(Suppl. PJ. 10). 



Specific Characters. Female. Body very slender, though, as in the other 

 species of this genus, having the anterior division somewhat expanded and much 

 broader than the posterior. Cephalic segment about the length of the 3 succeed- 

 ing segments combined, and produced in front to a rather small rostral prominence. 

 Lateral parts of the 3 succeeding segments somewhat expanded and separated 

 by narrow incisions. Last pedigerous segment considerably narrower than the 

 preceding ones, and obtusely produced on each side. Urosome very slender and 

 elongated, exceeding 2 /s f the length of the anterior division, genital segment 

 imperfectly subdivided in the middle, last segment very small. Caudal rami short 

 and closely juxtaposed, being scarcely more than half as long as they are broad, 

 apical setae of rather peculiar appearance, the 2 middle ones having their 

 proximal part remarkably dilated, the inner one attaining about half the length 

 of the body. Anterior antennae not very slender, scarcely attaining the length 

 of the cephalic segment, and, as usual, composed of 8 articulations, 3rd joint the 

 largest, 4th joint comparatively short, terminal part about half the length of those 

 joints combined. Posterior antennae and oral parts exhibiting on the whole the 

 structure characteristic of the genus. 1st pair of legs with the outer ramus ex- 

 tending a little beyond the 1st joint of the inner, 2nd joint of the latter ramus 

 scarcely longer than the 1st, and not much attenuated. The 3 succeeding pairs 

 of legs powerfully developed, with the rami rather broad, the outer one being 

 the longer. Last pair of legs with the distal joint lamelliform and broadly oval 

 in outline. 



Colour not jet ascertained. 



Length of adult female 0.69 mm. 





