﻿COPEPODA ici 



The first segment of the left exopodite is fairly loiio- and slender, while the second, as shown in text- 

 fig. 41 f, is broad and widened ont terminally, where a bifnrcate spine is seen; the third segment (PI. V 

 fig. 7 a) is distinctly widened out towards the end and produced inwards, where tlie nsnal tuft of mar- 

 ginal setae is observed; on the posterior surface groups of delicate hairs are found. Inwards at the 

 base of Re III, a partly independent, lobe is observed with groups of fairly long hairs posteriorly. 



The outline of the lahniiii is, as seen in fig., very similar to that of the female, but the whole 

 apparatus is soft-skinned without any setae, but adorned with an intricate systeme of chitinous ridges; 

 two labial lobes are present with a longitudinal furrow between. 



Parasites. In one specimen twisted structures like those descrilicd in Gaidiits tcmiispimis 

 (p. 92) were attached behind both maxillae; in another specimen a similar organ was found behind 

 the one maxilla only, but in that specimen a "sac-shaped parasite?" was foinid attached to the Li I 

 of the left maxillula. 



Occurrence. The Thor Expedition has "/^ 1904 vSt. 183 6i°3o L. N. ij^oS L. W. Vt. 1800 M. Wire 

 gathered 3 young females, 11 adult males and 9 young males. 



The jNIonaco Expedition has taken immature females at two stations, and Farran has recorded 

 adult males as well as immature ones from the west coast of Ireland "on four stations from depths of 

 600 to 1 1 50 fathoms". 



Remarks. I am ^jretty well convinced that the described species is identical with Sars' Gciidiiis 

 i/ofacniif/iiis, in spite of a few differences from the somewhat meagre description, viz: in the antemiulae, 

 which are not "presque aussi longues que le corps". The male is probably identical with that described 

 by Farran. The male, which vScott has referred to this species, is 5'9 nun. long and has rounded 

 lateral corners; accordingly it is not the male of C/t. uotacaiitha^ and it ma\- more naturally be regarded 

 as the male of 67/. piistiilifcra. Sars and Farran as well as the other authors have jjrovisionally 

 referred this species to Gaidiiis, as the adult females are not yet known. Several structural features 

 have, however, convinced me that this species like C/i. parvispiiia, and probably also Gaidius validus 

 Farran (1908, p. 32), G. crypfospiiiits G. O. vSars (1905, ji. 10), divaricatits Cr. O. vSars (j). 10) and Ct. maxiiuus 

 Wolf. (1906, p. 2), is nearly related to UiidcitcIuTtc specfabilis G. O. Sars (1900) p. 59 as well as to Clii- 

 rud/iia Sfrrrfsii, pusfiilifcra and ah\ssalis. It differs from Gaidius trintispiiiits etc. by the three-seg- 

 mented exopodite of the first pair of legs with well developed vSe Re I, by the wanting .setae along 

 the inner margin of the second basipodite in the fourth pair of legs in the yt)ung specimens of the 

 fifth stage, as well as l^y the structure of the oral surface of the labrum and the lamina labiali-s. 



All the described males referred to this genus show a marked siniilaritv to Uiidiitcluctc in the 

 structure of the fifth pair of legs, and are accordingU' different from those of Gaidius and Gaitanus. 



44. Chirudina parvispina I'arran. 

 (PI. V figs Sa; text-figs 42a-g and 43 a-h.) 



1900? Uiulcucluutc spectabilis n. sp. G. O. .Sars, pp. 59 -63, pis XV— XVI. 

 1908. Gaitliu.s parvLspinus 11. .sp. Farnui, ])]). 34 -,'55. P'- " f'S'' 4 J^- 



Description. Y^ (St. V). Size of young male from Thor St. 183 was 5-1 nun.; anterior division 

 4-14 nun.; inosome 0-96 mm. \'ouug female measured 4-42 mm. Ivirran's specimens measured 4-0 mm. 



