130 



Last pair of legs, as usual, smaller than in female, with the inner expansion of 

 the proximal joint shorter and provided with only 3 marginal setse. 



Colour pale yellow, with dark red intestine. 



Length of adult female 0.65 mm. 



Remarks. This form may be easily distinguished from the preceding 

 species by the small size of the anterior antennae and by the structure of the 1st 

 and last pairs of legs. The small size of the 2 outermost apical claws on the 

 outer ramus of the 1 st pair of legs is especially characteristic, and has given ris 

 to the specific name here proposed. 



Occurrence. I have met with this form occasionally in the upper part of 

 the Christiania Fjord, as also in the neigbourhood of Trondhjem, in depths ranging 

 from 6 to 20 fathoms, muddy bottom. 



83. Daetylopusia brevicornis (Glaus). 



(PI. LXXX). 

 Dactylopus brevicornis, Claus, Die Copepodenfauna von Nizza, p. 29, PI. Ill, figs. 20 25. 



Syn: Dactylopus latipes, Boeck (not Scott). 



Specific Characters. Female. Body comparatively short and stout, with 

 the 2 divisions more sharply defined than in most other species. Cephalic seg- 

 ment rather large and broad, about the length of the 4 succeeding segments com- 

 bined; rostrum of moderate size, obtuse at the tip. Urosome considerably nar- 

 rower than the anterior division and only very slightly attenuated behind. Caudal 

 rami twice as broad as they are long, apical setse rather slender and divergent, 

 the innermost but one almost twice the length of the urosome. Anterior antennae 

 remarkably short and robust, densely setiferous, and consisting of only 5 distinctly 

 defined joints, 2 of which belong to the distal part, 3rd joint rather expanded 

 and exhibiting a slight indication of a subdivision into 2 segments. Posterior 

 antennae with the terminal joint of the outer ramus very short. 1st pair of legs 

 rather strongly built, with both rami comparatively short and broad, the inner 

 one being only slightly longer than the outer, apical claws of both rami remarkably 

 strong and curved, minutely denticulated on the concave edge. Last pair of legs 

 with the distal joint oblong oval, somewhat tapering distally, and more or less 

 extant, being visible in the dorsal view of the animal, marginal setae t> in number 

 and rather slender; inner expansion of proximal joint of moderate size, scarcely 

 however extending as far as the distal joint, marginal setae rather unequal, the 

 middle one much longer than the others. Ovisac narrow oblong in form. 



