96 



the cephalic segment and, as in the type species, composed of 7 well defined 

 joints clothed with rather strong finely denticulated setae; the first 2 joints 

 much larger than the others, terminal part, composed of the 3 outermost 

 joints, about half the length of the proximal one, with the last joint the largest. 

 Posterior antennae comparatively feeble in structure, with the outer ramus 

 rudimentary. Mandibular palp without any distinctly defined outer ramus, its 

 place being occupied by a simple seta. Maxillae and maxillipeds scarcely 

 different from those in the type species. Natatory legs, as in that species, 

 well developed, with both rami distinctly 3-articulate, being in 1st pair of 

 about equal size, in the succeeding pairs a little unequal, though less so than 

 in the type species. Last pair of legs with the distal joint considerably pro- 

 duced and of narrow linear form, carrying 5 comparatively small marginal 

 setae, the proximal one of the outer edge rather remote from the others; 

 proximal joint quite short, and not at all expanded inside, with only 2 small 

 juxtaposed bristles on the hind margin. 



Male somewhat smaller than female, and resembling it in the general 

 shape of the body, being however easily recognised by the more strongly 

 built and distinctly hinged anterior antennae. - 

 Colour whitish pelluid. 

 Length of adult female 0.83 mm. 



Remarks. In its outward appearance this Copepod bears a general 

 resemblance to the form described above as Leptocletodes debilis, exhibiting 

 a rather- similar slender and narrow shape of the body and a similar week 

 consistency of the integuments. On a closer examination, however, the structure 

 of the several appendages, and more particularly that of the natatory legs, is 

 found to be esentially different, and on the whole perfectly agreeing with that 

 in Argestes mollis, with which species it accordingly must be assosiated in 

 the same genus. 



Occurrence. I have only met with this form in a single locality on 

 the Norwegian coast, viz., at Riser, where .some few specimens were taken 

 from the considerable depth of 60 80 fathoms, muddy bottom. 



Gen. Euterpina, Norman, 1903. 



Syn: Euterpe, Glaus (not Swainson). 



Generic Characters. Body subpyriform in shape, with no very sharply 

 marked limit between the anterior and posterior divisions. Cephalic segment 

 large and acutely produced in front. Urosome comparatively small, with the 



