193 



spines and a slender seta. Natatory legs all of the same structure, though slightly 

 differing in size, the 4th pair being considerably smaller than the other 2; outer 

 ramus in all of them rather narrow, with no seta inside the 1st and last joints; 

 inner ramus much coarser than the outer, proximal joint with a strong seta inside, 

 distal joint considerably larger, with 2 thickish setse inside, 2 others at the tip, 

 and a short spine outside near the end. Last pair of legs having outside a small 

 knob-like prominence carrying a slender hair-like bristle, and immediately inside 

 it another knob-like prominence tipped with 2 spines and representing the rudi- 

 mentary distal joint, innermost part of each leg forming a short lamellar expan- 

 sion carrying 3 subequal ciliated set3. Ovisacs very small and extended laterally, 

 each containing only one or two ova. 



Colour whitish. 



Length of adult female 0.50 mm. 



Remarks. This form may be easily recognized from any of the other 

 Harpacticoida by the unusual appearance of the caudal rami, which are extremely 

 slender and curved outwards in a most peculiar manner, their apical setse being 

 extended straight laterally, not as usual behind. This peculiarity has indeed given 

 rise to the specific name divaricata here proposed. 



Occurrence. Only 3 female specimens of this remarkable Copepod have 

 hitherto come under my notice. One of these specimens was taken at Bukken, 

 west coast of Norway, the other 2 at Farsund. In both localities it occurred at 

 a depth of about 50 fathoms, muddy bottom. 



Fam. 12. Canthocamptidae. 



Characters. Body, as a rule, slender, more or less cylindrical in form, 

 with no sharp demarcation between the anterior and posterior divisions. Rostrum 

 in most cases very small, and not distinctly defined behind. Anterior antennae 

 more generally 8-articulate, and distinctly hinged in the male. Posterior antennae 

 with the outer ramus comparatively small. Mandibular palp likewise in most 

 cases of insignificant size. Posterior maxillipeds terminating in a well-developed 

 clawed hand. 1st pair of legs more or less distinctly prehensile, the inner ramus 

 being generally longer than the outer and bent in its outer part. Natatory legs 

 more or less slender, with the outer ramus always longer than the inner, which 

 in some cases becomes much reduced. Last pair of legs in female more or less 



