236 



COPEPODA 



serrated spine in addition to the usual pinnate setae with laminae-formed serrated membrane; the lobe 

 V has two rather delicate bristles posteriorly, of which one is short, and in addition 2 very long ser- 

 rated membraniferous setae (figs 3c-d). The endopodite (cf. Wolfenden's PL XXXI fig. 11) has 7 

 longer or shorter brush-shaped sensory setae as well as a long slender vermiform one. The viaxillipeds 

 (PI. VII fig. 3 e) are in main features like those described b)' Farran and Wolfenden; the compara- 

 tive length of the main divisions is 47, 41 and 43; the first basipodite has in the middle no brush- 

 shaped seta, but a fairly long pointed seta; the second basipodite is distinctly twice as long as wide. 

 The two last setae of the segments of the endopodite are curiously developed, as shown in fig. 3 f 

 (PI. VII); the last segment has in addition to these two setae two simple setae and a plumons one 

 (not drawn by Wolfenden). 



"YXx^ first pair of legs is like Sars' figure of X. borealis, but the Se of Re I and II are short, 

 as seen in Farran's fig. 9; both surfaces are smooth. The second pair of legs has a short blunt Se 

 in the first inner segment (fig. 18 c); the second inner segments possess on the posterior surface two 

 groups of 12 strong spines; the posterior surface of the exopodite is completely smooth; the terminal 

 seta is short and broad (PI. VII fig. 3 g), and its teeth are only free in their terminal portion; well 

 developed glandular pores are found in Re I, II and III at the base of Se 3. The third pair of legs is 

 like that of the preceding pair, but the second inner segment has 9, and the third inner segment has 

 7 spines. Tlie fourth pair of legs has on the posterior surface of the second inner segment 19 com- 

 paratively short and slender spines; on the posterior surface of the third inner segment a number of 

 short bristles is found. 



The fifth pair of legs of the examined specimen, which is probably a young male, is distinctly 

 different from Farran's description of a young male, and is asymmetrical; the left smaller leg consists 

 as seen in fig. 18 d, of three segments; the exopodite has two outer and a terminal spine; a rudimentary 

 styliform endopodite is present. The right leg is somewhat longer than that of the left side, and the 

 endopodite as well as the exopodite has two segments. 



The lateral outhne of the labrum etc. is, as seen in fig. 18 a (PI. VIII), rather characteristic. 



Occurrence. The Thor has in 1904 or 1905 in the Atlantic south of Iceland without locality 

 taken a young male of this interesting species. 



This species has previously been recorded from the west coast of Ireland "at depths of from 

 680 to 1 150 fathoms", from the Bay of Biscay and by the Monaco Expedition. 



Remarks. On full consideration I think that this species is identical with Farran's X. Grcnii 

 in spite of the larger size and the distinct tooth of the lateral corner. It is probably also identical with 

 Wolfenden's X. calaviimis^ though differing in the features mentioned as well as in a few others. 



77. Xanthocalanus pinguis Farran. 

 (PI. VII figs 2 a— d, text-figs 77 a— b). 



1S97? Xanthocalanus hirtipes n. sp. Vanhoffen, p. 282, fig. iS. 

 1905- — pinguis u. sp. Farran, pp. 39— 40, pi VIII 



—IX. 

 1906. — — Farr. Pearson, p. 20. 



1908. Xanthocalanus pinguis Farr. Farran, p. 4S, pi. IV fig. iS. 

 1908. — — — V. Bremen, pp.60— 61, fig.68. 



1908? — — — Wolfenden, p. 35. 



