COPEPODA 



241 



rounded not "obtusement triangulaire", by longer urosome, by shorter antennulae not "aussi longues 

 que le corps". I think it is quite impossible at present to tell whether the described male ought to 

 be regarded as identical with any of these three species, or whether it is the male of a not yet 

 described female. 



79. Xanthocalanus hirtipes Vauhoffen. 



i9°5 



1897 

 1900 



1902 



1902 

 1903 



1904 



i9°5 



Xanthocalanus hirtipes n. sp. Vauhoffen, p. 282, fig. 18. 



— borealis n. sp. G. O. Sars, pp.49 — 51, 



pi. XI. 



— G. O. Sars. Th. Scott, pp. 452 

 —453. pl- XXII figs 8-9. 



— hirtipes Vanh. Mrazek, p. 523. 



— borealis G. O. Sars. G. O. Sars, p. 46, 



pl. XXXI— XXXII. 

 PQnecd' — subagilis n. sp. Wolfenden, p. 118, pl. 



IX figs 17 — 32. 

 borealis G. O. Sars. G. O. Sars, p. 5. 



Xanthocalanus borealis G. O. Sars. Farran, pp. 38 — 39, 



pl. VIII figs 14 — 17. 



1906. — Pearson, p. 20. 



1907. — Vanh. Vanhoffen, pp. 514 — 



517, Taf. 21, fig. 16—22. 



1908. — G. O. Sars. v. Bremen, pp. 58 — 



59. fi g- 66 - 

 subagilis Wolf. v. Bremen, pp. 62—63, 



fig. 71. 

 borealis G. O. Sars. Wolfenden, p. 33. 

 hirtipes Vanh. Stephensen, p. 318. 



— pars. 



1908? 



I9 J 3- 



Of this species I have only examined a single, very mutilated, adult female found in the con- 

 tents of the stomach of a Liparis barbata from Kara Sea. I have included it in this paper partly 

 because it certainly belongs to the fauna of this region, and partly because a full synonymy and a 

 discussion of its position seem to be useful. 



The lateral corners of the thorax are distinctly pointed, as in Sars' figure Pl. XXXI. The exo- 

 podite of the maxillulae has only 9 setae, as stated by Sars. 



The fifth pair of legs is most similar to that described by Vanhoffen (Taf. 21 fig. 22), with 

 three terminal spines only, but the last segment is fairly well distinguished, and the hairs, especially 

 those of the posterior surface of the third segment as well as those of the inner surface of the first 

 segment, are distinctly longer. The labrum etc. are in all main features like that of the preceding species. 



To decide whether X. hirtipes and borealis really belong to the same species is somewhat dif- 

 ficult without specimens of both forms at disposal. The character found in the size is not of much value, 

 when remembering that Farran's specimens varied from 2 - 5 to 3-5, that Sars' measured 3-5, and 

 Vanhoffen's 4 mm.; the characters found in the structure of the fifth pair of legs are not sufficient, 

 when taking into consideration the great variations which, according to Farran, exist in the structure 

 of this pair of legs. Vanhoffen thought that characters could be found in the spinulatiou of the 

 posterior surface of the endopodites of the natatory legs; the differences pointed out by him are cer- 

 tainly due to individual variability. To define the limitations of the species within this group is 

 probably a task just as difficult as that which has previously been discussed with Calanus and Pseu- 

 docalanus. 



80. Phaenna spinifera Claus. 



(Pl. VII figs 1 a — c; text-fig. 79). 



1863. Phaenna spinifera n. sp. Claus. p. 189, Taf. XXXI figs 1 — 7. 1903. Phaenna spinifera Claus. Thompson & Scott, p. 246. 



1892. — — Claus. Giesbrecht, p. 293, Taf. 5, 12, 37. 



1893. — — Th. Scott, p. 81, pl. VI— VII. 

 1898. — — Giesbrecht & Schmeil, p. 50. 

 1903. — — — J. C. Thompson, p. 23. 



The Ingolf-Expedition. III. 4. 



I903. 

 I904. 

 I904. 

 I9°5- 



Cleve, p. 367. 

 Wolfenden, p. in. 

 Cleve, p. 194. 

 Wolfenden, p. 1009. 



3i 



