14 



the Norwegian coast, from the Christiania Fjord at least up to the Trondhjem 

 Fjord. It is generally met with in depths ranging from 10 to 60 fathoms, espe- 

 cially where the bottom consists of coarse sand; much more seldom it is found 

 in shallower water among algae. Like the other species of the present genus, it 

 is a true bottom-form, keeping constantly close to the ground. When disturbed, 

 it darts away with great rapidity, to settle again very soon in another place. 

 I have never seen it moving freely for any length of time in the water. 



Distribution. British Isles (Brady), Cuxhaven (Timm), Mediterranean 

 (Giesbrecht), Polar Islands north of Grinnel Land (2nd Frarn Exped.). 



5. Cyelopina brevifurca, G. 0. Sars, n. sp. 



(PL VI). 



Specific Characters. Female. Body moderately slender, with the anterior 

 division oblong oval in form, greatest width scarcely exceeding half the length, 

 front evenly rounded. Tail not attaining half the length of the anterior division, 

 genital segment comparatively large, being fully as long as the 3 succeeding seg- 

 ments combined, anal segment shorter than the preceding one. Caudal rami very 

 small, being scarcely longer than they are broad, seta of outer edge slender and 

 attached about in the middle, apical setse rather elongated, the inner medial 

 one considerably exceeding the length of the tail and, like the outer, clothed in 

 its proximal part with coarse distant hairs, seta of outer corner unusually slender, 

 being fully as long as that of the inner corner. Anterior antennas comparatively 

 longer and more slender than in C. gracilis, though not quite attaining the length 

 of the cephalic segment, and composed of 12 well-defined joints, the 6th of which 

 is much the largest, the 6 outer joints short and all of equal size. Posterior 

 antennae with the terminal joint about the length of the antipenultimate one. 

 Natatory legs about as in C. gradlis. Last pair of legs, as in that species, bi- 

 articulate, distal joint, however, comparatively larger, exceeding in length the 

 proximal one, and narrow oblong in form, inner edge finely ciliated, tip armed 

 with 2 slender and somewhat unequal spines, having between them a slender 

 bristle. Ovisacs of moderate size, oval in form, and borne closely appressed to 

 the sides of the tail. 



Body rather pellucid, of a whitish gray colour, with light bluish trans- 

 parent ovaria. 



Length of adult female 60 0.70 mm. 



Remarks. This form is closely allied to C. gradlis Glaus, but differs 

 conspicuously in the shape of the anterior division of the body, the more slender 



