162 



Gai'dius tenuispinus, G. 0. Sars. 



(See PI. XVIII & Suppl. PI. VI, fig. 1). 



Cl/hidius tenuispinus, G. 0. Sars, Crustacea of the Norw. North Polar Expedition, p. 67, Pi. XVIII. 



(For the description of the female, see p. 30). 



Description of the Male. Anterior division of body, seen dorsally. oval 

 in form, somewhat attenuated anteriorly, with the greatest width occurring consi- 

 derably behind the middle. Lateral processes of last segment of metasome well 

 marked, and of the same appearance as in the female. Urosome, as usual, much 

 narrower, and composed of 5 segments, the last of which, however, is very small, 

 almost obsolete. Anterior antennas of about the same relative length as in female, 

 but transformed in the usual manner, their proximal part being rather dilated, and 

 clothed in front with large curved sensory appendages, terminal part very slender, 

 and forming with the proximal one a somewhat angular curve. First pair of legs 

 with the 1st joint of the outer ramus distinctly separated from the 2nd. Last pair of 

 legs comparatively large, and somewhat resembling in structure those in the male 

 of Chiridius armatus. both legs provided with a rudimentary inner ramus, that 

 of right leg pronouncedly club-shaped, that of left much narrower; outer ramus 

 of right leg biarticulate, with the proximal joint rather large and curved, distal 

 joint very narrow, and forming a small rounded lobule inside, beyond the middle; 

 that of left leg 3-articulate, last joint spiniform. 



Length of the specimen examined about 2 mm. 



l>'<'iii<n-ks. It will be seen from the above short description, that the sexual 

 differences in the present form do not materially differ from those found in the 

 genus Chiridius, and the last pair of legs in the male even bears a very close 

 resemblance to those in the male of Clurnlnix iiniiutit*. 



Occurrence. The above-described specimen was found in the same sample 

 (Stat. 34) in which jEtideopsis unnata occurred, and could at once be recognized 

 as the male of the present species by the slender spiniform processes issuing 

 from the last segment of the metasome. 



Gai'dius brevispinus, G. 0. Sars. 



(Suppl. PI. VI, fig. 2). 

 Chiridius brevispinus, C. 0. Sars, Crustacea of the Norw. North Polar Expedition, p. 68, PI. XIX. 



Specific Characters. Female. Body comparatively robust, with the anterior 

 division rather massive and, seen dorsally, oblong oval in form ; anterior extremity 

 somewhat contracted near the tip, which appears obtusely truncated, posterior 



