126 G. 0. SARS. CRUSTACEA. [norw. pol. exp. 



The inner ramus has the 1st joint almost as long as the other 2 combined, 

 and considerably broader, with 2 hair-like bristles inside. The 2nd joint 

 has a similar bristle inside, and the 3rd joint carries 3 natatory setse, the 2 

 apical ones being very long, whereas the 3rd, which issues from a ledge 

 inside, is considerably shorter, and is peculiarly twisted in its distal part. 



The 2nd pair of legs (fig. 9) have the basal part quite simple, without 

 any bristles or setse. The outer ramus, as in the 1st pair, is distinctly 

 3-articulate, with the 1st joint much longer than the other 2 combined. This 

 joint is finely cihated along the inner edge; but the outer edge is perfectly 

 smooth, without any armature whatever. This is also the case with the 2nd 

 joint, which, however, carries the usual natatory seta inside. The 3rd joint 

 is somewhat larger than the 2nd, and carries 5 natatory setae, and, outside 

 the 2 apical ones, a very small ciliated bristle. The inner ramus is both 

 shorter and narrower than the outer, and is composed of only 2 joints, the 

 1st quite simple, the 2nd, in addition to the 3 setse found in the 1st pair, 

 carrying inside them a very small ciliated bristle. 



The 3rd pair of legs are of the same structure as the 2nd, except that 

 the inner ramus (fig. 10) is uniarticulate. 



The 4th pair of legs (fig. 11) are considerably smaller than the others, 

 and have the outer ramus biarticulate, with 5 natatory setse, 4 of which 

 belong to the distal joint. The inner ramus, as in the 3rd pair, is uniarti- 

 culate, and much smaller than the outer, carrying 3 natatory setse of about 

 equal size, 2 apical and one lateral. 



As stated above, not the slightest trace of any 5th pair of legs is to be 

 detected. 



Occurrence. Some few specimens of this remarkable Copepod, all of 

 the female sex, were found in the same sample in which the above-described 

 LuhhocMa glacial-is occurred. 



