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



mandibular palps are very conspicuous, and much stronger than in the female, 

 originating close together along the median line. 



The tail is much more slender and elongated, almost half as long as the 

 anterior division, and is divided into 5 well-defined segments, the 1st of which 

 is very small, the 2nd much the largest. The caudal rami are mobile and 

 more or less widely divergent. 



The anterior antennae (see fig. 13) are considerably dilated in their prox- 

 imal part, which is clothed in front with large sensory appendages in addition 

 to the bristles. They are only composed of 22 articulations, of which the 1st 

 and 7th are particularly large, the latter even equalling in length the 6 suc- 

 ceeding joints combined, and apparently representing 4 united articulations. 



The posterior antennae are more strongly developed than in the female, 

 and this is also the case with the mandibular palps, whereas the oral parts 

 otherwise appear much reduced. 



The last pair of legs (fig. 14) are comparatively small and simple in 

 structure, being built upon the same type as in Pseudocalanus. The 2 legs 

 each form simple stems, but are very unequal in size, the right leg being 

 scarcely more than half as long as the left, and only composed of 3 joints, 

 the last of which is lamelliform, not, as in Pseudocalanus, styliform. The 

 left leg, as in that genus, is composed of 5 well-defined joints, the last of 

 which is very small, and hook-shaped. 



Occurrence. This form occurred not infrequently in a sample taken 

 February— March, 1894, in about the 80th degree of latitude, and was also 

 found occasionally in another sample taken on the 22nd May of the same 

 year, somewhat farther north and west. 



16. Drepanopus Bungei, G. 0. Sars. 



This form, recently described by the present author from specimens taken 

 by Dr. Bunge in the mouth of the Jana River, was found, though rather 

 sparingly, in the same 2 samples in which Spinocalanus longicornis 

 occurred. 



