COPEPODA 535 



Occurrence. The Thor has gathered 2 specimens: 



"/ 7 1904 St. 183 6i30 L. N. I7o8 L. W. Yt. 1800 M. Wire i f?. 

 IO / 7 1904 St. 180 6i34 L. N. i6O5 L. W. Yt. 1800 M. Wire i fc?. 



Remarks. It is not without some doubt that I have established a new species for the described 

 male and female. In spite of the variations in the fifth pair of legs, which is not uncommon to 

 several species, I think that the different shape of the fifth pair of legs, the larger size, and the dif- 

 ferent armament of the first pair of legs warrant the establishment of a new species for the female. 

 I think that the males of the two species are distinctly distinguishable especially by the right leg of 

 the fifth pair of legs. 



76. Xanthocalanus Greenii Farran. 

 (PI. VII figs 3 a g; PI. VIII figs 18 a d). 



1905. Xanthocalanus Greenii n. sp. Farran, p. 39, pi. VIII figs 



1906. Farr. Pearson, 20. 



1906? calaminus n. sp. Wolfendeu, p. 34, pi. XI 



figs 35- 



1907. Greeni Farr. G. O. Sars, p. 13. 



1908. Xanthocalanus Greeni Farr. Farran, p. 48. 

 1908. v. Bremen, p. 60, fig. 67. 



1908. calaminus Wolf. Wolfenden, p. 34. 



1911? Talacalanus calaminus Wolf. Wolfenden, pp. 279281, 

 Taf. XXXI, figs 912, text-figs 44 a b. 



Description. YC? (St. V). Size of young male was 8 - i2 mm.; anterior division 6-69 mm.; uro- 

 some 1-43 mm. Farran's specimen measured 6 - o mm. and Wo If end en's 5-5 mm. 



The anterior division is short and robust, about 4^5 as long as the abdomen. The rostrum 

 consists of a proximal portion, continued into 2 thin, but stiff, rather long and somewhat divergent 

 branches (PI. VIII fig. 18 a). The head is rounded without any trace of crest The first thoracic tergite 

 is well marked in front by an articular line, which, beneath, is seen to be continued between the in- 

 sertion of the maxillae and maxillipeds, as is the fifth thoracic tergite, as seen in fig. 18 b. The lateral 

 corners are produced and terminated with a small tooth. 



The comparative length of the abdominal somites and the furcal branches is 10, 17, 13, 7 and 

 15; the furcal branches are 1-4 as long as wide; serrated seam along the hinder margin of somite 

 II III is well developed. 



The antennulae extend almost to the end of body; the appendages of the 24 segments are 

 like those of the preceding species; the Sp. of segment 24, which was broken, was placed in the 

 middle of the segment; the measurements are in the main like Farrau's description. The antennae 

 are like Farran's description, with two rami of about equal length. The mandibulae have a long and 

 slender manducatory part with rather weak teeth; the third basipodite has three long slender spines, 

 of which the most distal is almost twice as long as the proximal ones. The maxillulae have 7 long 

 powerful + shorter bristles in the exterior lobe; the Li I (PI. VII fig. 3 a) has 4 rather delicate Sa and 

 10 Sp., of which at least 8 are widened out to lancet-shaped laminae with delicate serration, as seen 

 in fig. 3b; the Li 2 has 4 setae, and so has Li 3, and while the third basipodite has 4 Sa + i Sp the 

 endopodite has n setae and the exopodite 10. The maxillae are only slightly produced posteriorly; 



Lob. I has 5 setae, lobe II III has 3 setae, and lobe IV (PI. VII fig. 3 c) has a strong slightly curved 



30* 



