COPEPODA 225 



especially on account of the wanting strong spines of the endopodite; the dentation of the third basi- 

 podite is not better developed than in related species; the fourth lobe of the second basipodite has 

 two short setae in addition to the spine. 



The natatory legs are scarcely different from those of the female. The fifth pair of legs is not 

 unlike Wolfenden's description, but his right foot corresponds to the left one in my specimens (PI. 

 VII figs 4f g). The right foot (fig. 156) consists only of three segments and a short terminal tooth. 

 The left leg consists of 5 long proximal segments, in addition to a fairly short, attenuated and hairy 

 third outer segment, which has a short terminal seta (fig. 4g). 



Ygi (St. V). Size of female from Thor St. 183 was 6-3 mm.; anterior division 5-1 mm.; urosome 

 1-2 mm. Size of male 6-4 mm. 



The shape of the body is like that of the adult female, but the lateral corner is more pointed 

 (fig. 15 f); the abdomen consists of four somites, the comparative length of which was 10, 19, 14, 8 

 and 5. The appendages, except the fifth feet, are in the young female like those of the adult females 

 (PI. VII fig. 4h), this pair is even less developed than that of the adult, as seen in the drawing; in the 

 male each leg consists of four segments, and the left leg is considerably longer than the right one; about 

 the arrangement of hairs and setae I refer to fig. 15 g. 



Occurrence. The Thor has in Denmark Strait once gathered this species viz: 



'9/6 1904 St. 152 65oo L. N. 28io L. W. Yt. 200 M. Wire i f?. 

 In the Atlantic, south of Iceland: 



'% 1904 St. 180 6i34 L. N. I9o5 L. W. Yt. 1800 M. Wire if?, i f c?. 



"/ 7 1904 St. 183 6i30 L. N. I7o8 L. W. Yt. 1800 M. Wire 31 f?, 6 f^, 3 y? (V), 4 y<? (V). 



In the Iceland-Faeroe Channel: 



I2 / 5 1904 St. 78 6i07 L. N. 93o L. W. 3 f ?. 

 In the Atlantic, south west of the Faeroes: 



% 1905 St. 72 5752 L. N. 953 L. W. Yt. 1500 M. Wire 4 f ?. 



Distribution. According to Farran "this species is of frequent occurrence in deep-water tow- 

 nettings off the west coast of Ireland", at depths of from 330 to 1150 fathoms. By the Gauss it was 

 taken 9/ IO near the Cape Verde Islands, and I2 / It it was taken about 35 L,. S. 0-5 L,. E. 



Remarks. In spite of minor differences I do not doubt that this species is identical with Cor- 

 nucalanus magnus Wolf.; Wolfe n den refers Thompson's Sc. chelifcr to a different species on account 

 of a wanting frontal spine; as Thompson's description of a young male is so very imperfect, I prefer 

 to follow Farran and Pearson. 



72. Onchocalanus magnus Wolfenden. 

 (PI. VII figs sa-g; PI. VIII figs 16 a d). 



1906? Xanthocalanus magnus n. sp. Wolfenden, pp. 32 33, 



pi. X. 



1908? Wolf. Wolfenden, p. 37, pi. 



VII figs I 9. 



1911? Onchocalanus frigidus n. sp. Wolfenden, pp. 276 



-277- 



nee. magnus Wolf. Wolfenden, pp. 275 



~ 276, pi. XXX. 



The Ingolf-Expedition. III. 4. 29 



