COPEPODA 91 



placed one (not seen in fig.), are well separated ; the setae around the median circular spot Nr. 4 are 

 well developed. 



The lamina labialis is almost smooth, but in other respects scarcely different from fig. 7 f (PI. 

 II), and the area in front of it is most like fig. 5 e PI. III. The longitudinal lateral series of hairs 

 placed behind the lamina labialis are in details somewhat different from those of G. brevispinus; the 

 3 posterior groups of the third series are better separated, and without direct connection with the 

 anterior part; the proximal and distal groups of the series V seem to be fused. 



fj 1 . Size of specimen from Thor St. 183 was 3-01 mm.; anterior division 2-3 mm., urosome 071. 



The shape of the body is scarcely different from Sars' fig. PI. VI (supplement). The rostrum 

 is fairly long and shows, terminally, trace of bifurcation (PI. Ill figs. 2 f g). 



The antennulae have the segments 80^9 partly fused with 10, and the segments 12 and 13 with 

 14; the segments 20 and 21 and 24 and 25 are completely fused; the appendages are scarcely different 

 from those of Aetidius armatus (cf. Giesbrecht Taf. 14 fig. 15). The measurements differ from those 

 of the female by the segment 22, which is ri as long as segment 17 and 1-2 as long as segment 2. The 

 structure of the antennae is in most respects like that of the female, but the Si 2 of Re II is not 

 placed on a small process. The manducatory portion of the mandibulae (cf. fig. i d) is even more 

 thin-skinned than in G. brevispinus, but has rudimentary teeth; the third basipodite has no setae, 

 and those of the exopodites and endopodites are better developed. The maxillulae differ from those 

 of G. brevispinus (fig. i e) by a fairly long Li 2 with a number of rounded sensory organs. The maxillae 

 (PI. Ill fig. 2 h) are small, thin-skinned organs, which in the main preserve their original shape; 

 the exterior margin of the basipodite has no convexity; the inner surface possesses an indistinct 

 number of short partly fused lobes, the setae of which are more or less transformed into thin-skinned 

 more or less setiformed appendages with a swollen base; the Ri has a few setae of usual form. The 

 two first segments of the maxillipeds possess only the fourth lobe. 



^^ first pair of legs has, as shown in fig. i g, the Se Re II represented by a minute seta, and 

 the St. is as usual in the male almost straight (PI. Ill fig. 2i); the second to the fourth pairs of legs 

 are scarcely different from those of the females, except by the smooth inner margin of the second basi- 

 podite of the fourth pair of legs. The fifth pair of legs is on the right side in the main like Sars' 

 figure; the Ri (PI. Ill fig. 2 1) is distally swollen and contains clear alveolar structures; the Re I (I <N>II ?) 

 has in most specimens a lateral protuberance, and shows trace of segmentation (fig. 2m); the Re 

 II has inwards a lamelli-form process which surrounds a shallow cup facing backwards and outwards (fig. 

 2n, cf. fig. ij); the Re III is elongate and curved with a terminal hooked hairy process. The left leg 

 (text-fig. 22 d) appears more slender than in Sars' figure; the Ri which shows a trace of segmentation 

 is long and slender, distally somewhat enlarged and bearing a short hair; the Re 2 has inwards a hairy 

 protuberance (fig. 2J), and the Re 3 is very elongate with a distal fairly long Se and a St. (fig. 2k). 



Y (St. V). Size of female from St. 70 3-15 mm.; anterior division 3-51 mm., urosome 0-64. 



The shape of the body, except for the usual segmentation of the abdomen, is as in the female, 

 the antennulae extend almost to the end of the abdomen. The mouth appendages are scarcely in 

 any features of interest different from those of the female. Tli articulation between Ri I and II of 



pes II is less developed than in the female; the glandular pores were scarcely different Along the 



12* 



