24 



that in E. neglectum. Last pair of legs, however, differing conspicuously in 

 the shape of the distal joint, the outermost lobe of which is narrow digitiform 

 and defined from the remaining part of the joint by a deep and narrow 

 incision extending almost to the base of the joint; inner expansion of proximal 

 joint comparatively shorter than in E. neglectum, extending scarcely beyond 

 the middle of the distal one; marginal setae of both joints coarsely ciliated and 

 rather unequal in length, that issuing from the middle lobe of the distal joint 

 being the longest and extending about to the end of the genital segment. 



Colour of the living animal not yet ascertained. 



Length of adult female scarcely exceeding 1 mm. 



Remarks. The outward appearance of the present form looks so very 

 like that of E. neglectum G. O. Sars, that at first I was inclined to regard it 

 as merely an accidental variety of that species. Having however subsequently 

 obtained several specimens of this form from widely distant localities, and in 

 all of them found the very same characteristic structure of the last pair of legs, 

 I am now of opinion that it more properly ought to be regarded as specific- 

 ally distinct. 



Occurrence. I have found this form in 2 widely distant localities on 

 the Norwegian coast, viz., at Bejan, outside the Trondhjem Fjord, and at Ris0r, 

 in depths ranging from 20 to 50 fathoms. AH the specimens obtained were 

 of the female sex. 



15. Ectinosoma angulifrons, G. O. Sars, n. sp. 



(PI. XV, fig. 2). 



Specific Characters. Female. Body comparatively slender, with the 

 anterior division only slightly dilated. Rostral plate not much prominent and, 

 as seen from above, terminating in an acute angle. Urosome much shorter 

 than the anterior division and only slightly tapered behind; anal segment 

 scarcely exceeding half the length of the preceding segment, and slightly 

 incised behind in the middle. Caudal rami small, about as long as they are 

 broad, and somewhat divergent; apical setae of moderate length. Anterior 

 antennae resembling in structure those in the preceding species, though com- 

 paratively a little more slender. 1st pair of legs with the inner ramus, as 

 usual, much larger than the outer, which scarcely extends beyond the middle 

 joint of the former. Last pair of legs resembling in structure those in E. pro- 

 pinqvum Scott, the distal joint being subquadrangular in form and somewhat 

 unequally trilobed at the end; inner expansion extending beyond the middle 



