COPEPODA 



199 



basipodite without marginal setae. The fifth pair of legs is like Farran's figure, with a long and 

 strong inner seta, a rather short terminal seta, and a very delicate outer one; all segments are fused, 

 but the two basal ones are indicated. 



The anterior portion of the labrum is, in lateral view, less prominent than in preceding species ; 

 in front of the labrum proper behind the transverse line, which limits the antennal somite, a tuft 

 of long setae is found. The arrangement of setae on the anterior surface of the labrum (PI. VII 

 fig: ii a) is, as seen by comparing figures |cf. gb), like that of S. obtusifrons, but the lateral posterior 

 group is better developed, and the central group has only a few setae. The oral surface of the labrum 

 is most like that of S. globicips (PL VII fig. loa), but the granular area in front has much smaller 

 granules, and it is much smaller. The structure of the lamina labialis etc. is completely like that 

 of .S". globiceps. 



YC? (St. V). Size of young male from Thor St. 183 was 3-25 mm.; anterior division 3-51 mm.; 

 urosome 074 mm. 



The only difference, except the usual one in the shape af the abdomen, is found in the more 

 obtuse inner tooth of the third basipodite of the fourth foot. The segment 10 of the antennulae has 

 a seta, but the segment 17 has no proximal seta. The fifth pair of legs is more slender than in S. ob- 

 tusifrons, but is alike in other respects. 



Occurrence etc. The S/S Thor has gathered the species at a single station viz: "/ 7 1904 St. 183 

 6i30 I,. N. I7o8 L. W. Yt. 1800 M. Wire 5 f$, 2 yrf 1 (V). It has only been recorded once by Farran, 

 who has examined six specimens, taken at a depth of 700 fathoms off the west coast of Ireland. As to 

 the differences from the related species I refer to S. globiceps. The species is characterized by anten- 

 nulae about as long as the body, with a seta in segment 17. The Se of Re I pes I is fairly long and 

 slender, and the Se Ri I pes II is rather short and obtuse. The St. of Re III pes II has 35 partly 

 fused teeth. The inner terminal seta of the anterior surface of Basp. Ill pes III IV is only poorly 

 developed. The second basipodite of the third pair of legs has no spinous lamina. 



63. Scaphocalanus globiceps Farran. 

 (PI. VII figs 10 a b; fig. 11 b; PL VIII figs Qa-c; text-figs 63 a b.) 



1905.? Scolecithricella gracilis n. sp. G. O. Sars, p. 2. 



1908. Scolecithrix globiceps n. sp. Farran, pp.54 55, pi. V figs 813, pi VI fig. 8. 



Description. f$. Size of specimen from Thor St. 183 was 4-48111111.; anterior division 3-38 mm.; 

 urosome no mm. Farran's specimens measured 4-3 4-5 mm. 



The body is more slender, and the abdomen comparatively longer than in the preceding species; 

 the fifth thoracic tergite is somewhat produced, but rounded. The rostral branches, arising from a short 

 basal part, are almost straight, stiff and fairly long, apparently longer than the pointed slender fila- 

 ments (text-fig. 63 a). The genital somite is only slightly produced below, and has an elongate, distally 

 not enlarged, receptaculum seminis (text-fig. 63 b). The comparative length between the abdominal 

 somites is 53, 35, 30 and 10. The serration along the posterior margin of the somites is distinct, at 

 least dorsally. The antnrnular extend to the end of the furca; the appendages differ from those of 



