238 COPEPODA 



areas of numerous short hairs or granules were observed. The chitinous framework is on each side 

 in front of the third median circular spot produced into a beak-like structure; somewhat behind, a 

 transverse chitinous bar was found in the middle. Behind the fourth median circular spot a number 

 of short granules was found. 



In front of the indistinct lamina labialis a large group of short hairs is observed, consisting of 

 an inner and outer part; the hairs decrease in size outwards. Between the serrula 6-serrata a 

 group of granules is observed, and behind, outer and inner groups of longer and shorter hairs, as seen 

 in figure 2 c (PI. VII). Along the labial lobes inwards, marginal rows of long slender setae are found 

 anteriorly and short spines posteriorly; behind the lobes in the middle, areas of minute granules are 

 found, and the lobes possess laterally groups of irregularly placed fairly long and slender bristles, 

 limited inwards by an oblique row of somewhat shorter hairs. 



YQ (St. V). Size of young male was 4-43 mm.; anterior division 3-51 mm.; urosome 0-92. An- 

 other young male as well as a female measured 3-7 mm. 



The shape of the body differs from that of the adult by the comparatively better marked fifth 

 thoracic somite (text-fig. 77 b), and by the abdomen, which has four somites, the comparative length 

 of which is 5, 13, 9, 6 and 5; the furcal rami are a little longer than wide. They^M pair of legs in 

 the female is scarcely different from that of the adult; in the male (PI. VII fig. 2 d) it is distinctly 

 different; on the right side it differs by the two-segmented exopodite, the first segment of which has 

 a distinct Se, and the terminal segment of which has 2 terminal spines; the left leg shows a similar 

 segmentation, but is less hirsute and shows trace of segmentation in Re II. 



Occurrence. The Thor has gathered this species once in the Iceland-Faeroe channel and 

 once in the Atlantic south of Iceland. 



/s 04 St. 99 6i05 L. N. 9 35 L. W. Yt. 1700 M. Wire 2 f?, 2 y? (V), 3yd 1 (V). 

 I2 /5 04 SL 78 6io8 L. N. 28 L. W. i y<? (V). 



Distribution. This species has been recorded from the west coast of Ireland "at a depth of 

 630 fathoms". If it is identical with X. hirtipes Vanh. and borealis G. O. Sars, it has a wide distribution 

 viz. the west coast of Ireland, the Iceland-Faeroe channel, the west coast of Norway, Kara Sea and the 

 Arctic Ocean near the New Siberia Islands. 



Remarks. That this species is identical with the species which Farran 1908 has mentioned 

 as X.pinguis? seems not to be doubtful on account of its size 5-1 mm. and the almost identical shape 

 of the fifth pair of legs. From the typical specimens of Farran's species (1905) it differs by the more 

 pointed lateral corners of the fifth thoracic tergite, and by a somewhat different measurement of the 

 antennulae [the segment 22 is as long as instead of 1-3 (in fig. 20 PI. VIII the two segments are of 

 almost equal length) as long as segment 25], but especially by the more distinct spinulation of the 

 fifth pair of legs. When the variability of the fifth pair of legs is taken into consideration, I do not 

 doubt that the two different forms belong to the same species. 



It is nearly related to X. profundtis Sars (1907 p. 14), which differs from it by larger size, 

 6 - 2 mm., and by the somewhat different shape of the fifth pair of legs. 



