_380_ 



Ursome considerably shorter than the anterior devision, with the segments well 

 marked off from each other and densely spinulose at the hind edge ventrally and 

 laterally. Caudal rarai short quadrangular, broader than they are long, inner 

 medial seta conspicuously dilated in its proximal part and exceeding half the 

 length of the body. Anterior antennae of moderate lenght, gradually tapering 

 distally, and composed of 9 well defined joints, the 4 first successively diminishing 

 in size, terminal part about half the length of the proximal one. Posterior an- 

 tennae with the outer ramus distinctly 3-articulate, middle joint setiferous. Oral 

 parts of the usual structure. 1st pair of legs with both rami pronouncedly pre- 

 hensile, the outer one about equalling in length the 1st joint of the inner, its 

 middle joint long and slender, somewhat curved in its proximal part, last joint 

 very short, lamelliform, and armed with 3 strong curved claws, successively 

 increasing in length distally, and accompanied outside by a small bristle, inside 

 by a well developed curved seta; inner ramus with the 1st joint linear in form 

 and carrying near the end a comparatively short seta, the outer 2 joints very 

 small and connected by an oblique suture, the last one armed at the tip with 2 

 strong claws of unequal length. Natatory legs well developed, with the full 

 number of setae. Last pair of legs large and pronouncedly foliaceous, distal 

 joint of unusual size and very thin, obliquely rounded in form, and edged with 

 6 setae, one of them, issuing from the tip, very thin and hair-like; inner expansion 

 of proximal joint obtusely rounded at the tip and scarcely extending beyond 

 the middle of the distal joint, marginal setae 5 in number, the 2 outermost 

 closely juxtaposed. 



Colour not yet ascertained. 



Length of adult female 0.70 mm. 



Remarks. This species was described and figured by the present author 

 in the year 1909 from specimens procured during the 2nd Fram Expedition. 

 The arctic specimens were of larger size than those found off the Norwegian 

 coast, but otherwise agreed in all essential structural details. It is a very distinct 

 and easily recognisable species. 



Occurrence. Some few specimens of this form, all of the female sex, 

 were found in a sample taken by Mr. Nordgaard in the Trold Fjord, inside the 

 Lofoten islands. Another female specimen was derived from a sample taken, 

 many years ago, at Christiansund, west coast of Norway. 



Distribution. Polar Islands north of Grinnell Land (2nd Fram Exped.)- 



