68 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



given with those of C. armatus. Any more detailed description is not, I 

 think, needed. 



Occurrence. This form was found in 6 of the samples, 5 of them belonging 

 to the eastern part of the basin traversed, the 6th lying about in the middle, 

 near the 85th degree of latitude. The last sample was taken from the very 

 surface of the sea, whereas the others were from some considerable depth 

 below the ice. Only female specimens were found. 



11. Chiridius brevispinm, n. sp. 

 (PI. XIX). 



Specific Characters. ? Body comparatively robust, with the anterior 

 division more than 3 times as long as the posterior, and rather massive, 

 oblong oval in form. Front produced below to a distinct, though not very 

 large, acute rostral projection. Spiniform processes of last segment of trunk 

 very small and somewhat incurved. Caudal rami about as in C. tenuispinus. 

 Antennae and oral parts likewise resembling in structure those organs in the 

 latter species. 1st pair of natatory legs with the outer ramus distinctly 

 3-articulate, 1st joint, however, without any spine outside; the 3 succeeding 

 pairs normal. Length of adult female reaching 4'80 mm. 



Remarks. This is a rather large and robust species, somewhat resem- 

 bling in its outward appearance the above-described species of the genus 

 Undeuchceta. It is, however, a true Chiridius, agreeing in all more essential 

 characters with the other species of this genus, though easily distinguishable 

 from any of them, both by its large size and its robust form of body, and espe- 

 cially by the very short spiniform processes of the last pedigerous segment. 



Of this species also, I do not think it necessary to give any more detailed 

 description. 



Occurrence. This species, like the preceding one, occurred in 6 of the 

 samples, but not the same as that form, as 5 of them belonged to the 

 western part of the basin traversed. In one of the samples, taken between 

 March 26th and April 4th, 1895, in about the 84th degree of latitude, it 

 occurred rather plentifully; but no male specimens were found. 



