﻿j^Q COPEPODA 



to ffth groups consist of an inner more or less longitudinal row of fairly long setae inwards and of 

 more irregularly placed setae laterally; a sixth group of very short delicate setae is found; the trans- 

 verse rows are, as seen in figs, like those of Chirudma Strccisii. The lamina lahialis (PI. VI fig. i b) is 

 not quite like that of any of the examined sjiecies, as it consists, as shown in figure, of two rather 

 independent portions. The arrangement of tlie setae in front of the row is like that of Cliirudiiia Strectsii^ 

 but no granular area was observed. The arrangement of the series upon and behind the labial lobes is 

 in its main feature like that of C. abyssalis (PI. VI fig. i b; cf. PI. V fig. 5 f). Laterally a similar tuft 

 of hairs is found as in Cli. piisUilifcra. 



i^ (St. VI). Size of specimen from Thor St. 183 was 67 mm.; anterior division 5-2 mm.; urosome 1-5 mm. 



Tlie head is rounded, vvitli fairly slender rostral spine (te.xt-fig. 41 a). The body is more slender 

 than in the female; the articulation between the head and the first thoracic tergite is only indistinct; 

 the lateral spine of the tliorax is placed more dorsally, is more slender and apparently starts from the 

 fifth somite. The comparatively slender abdomen is about one third of the anterior division, and has, as 

 seen in text-fig. 41 b, the genital opening on the left side, and has a seam of short, delicate teeth along 

 the posterior margins of somites II — IV. The furcal rami are somewhat wider than long; the St. 2 is 

 somewhat longer than the abdomen. Tlie anlcntmlac extend about to the end of tlie second abdominal 

 somite; the segment 10 is partly fused with 8 "^ 9, the segment 12 with 13, but llie segments 21 and 

 22 are well separated on both sides; "..^isthetaskcn" are only wanting in segments 20, 23 and 24; the 

 measurements are very similar to those of the young ones. The exopodite of the antennae is only 1-3 

 as long as the endopodite; the Re I and II are indistinctly separated, and both possess a rudimentary 

 setigerous process, but the antennae are in other respects like the female. The viandibula scarcely 

 differs from that of Cli. Streetsii. The maxilliilae possess in Li i at least 10 soft-skinned ringed appen- 

 dages as well as two short setae of usual structure, in Li II, which is fairly long, 3 soft appen- 

 dages, and in Li HI 5 setae of usual structure are found; the basipodite III has 5 setae, tlie Ri I — II 

 have 7 setae, and the Ri III has 7 as well; the exopodite has 10 long setae and a short delicate inner 

 one, and the Le has 2 sliort basal ones and 5 long distal ones. The maxillae are soft-skinned, but they 

 are better developed than in most other .species of tliis family; the Lob. I — IV are well developed, and 

 possess 2 to 3 setae, and so does Lob. V, but its Sp. is strong and not twisted; the Re has 6 setae. Tlie 

 maxillipcds are in main feature like those of Ch. Streetsii; their third basipodite is 2-5 as long as Ri 

 and 1-5 as long as the two basal segments. 



T\\Q Jirst pair of legs has the articulation between Re I — II better developed, and the Se Re I 

 is cpiite rudimentary; the three last natatory legs are scarcely different from those of the young specimens. 



The right fifth foot has a rather short third basipodite; the right endopodite has some similarity 

 to that of Ch. Streetsii, is terminally gutter-shaped on the anterior surface, but has .somewhat proximally 

 to its end laterally a rounded incision (text-fig. 41 c); the outline of the endopodite is rather irregular, but 

 no marginal laminae or teeth were observed in proximal lialf. The right exopodite has the two first 

 segments fused, and is, ob.served from in front, distinctly convex towards the middle; llie third segment 

 is obtusely rounded, is rather elongate and possesses marginally a distinct lamina (text-figs 41c— d). Tlie 

 third basipodite of the lift foot is long, almost attaining the middle of Re Ics.II; the left endopodite 

 (text-fig. 41 e) is unsegmented, and is, as shown in fig., distinctly narrow somewhat beyond the middle. 



