i86 



COPEPODA 



somite, which is distinctly shorter than the following two, but 1-5 as long as the second, has a very 

 prominent and characteristic genital protuberance. The vulva is surrounded by a chicinous system 

 distinctly more complicated than figured by Wo If en den; more exteriorly, along the lower margin, 

 is found on each side a chitinous plate pointing forwards, which, somewhat in front of the middle, possesses 

 a short, rounded process (cf. Wolfenden). As stated by Wolfe nden, in contrast to Sars and Farran, 

 hairs were found on the ventral surface in the third and fourth abdominal somites in most specimens. 

 The antennulae extend scarcely to the end of the thorax; the appendages are scarcely different 

 from those of E. norv., and the measurements are not very characteristic; the segment 20 is as long 

 as the segment 24 <N3 25, and the 23 as long as the 16. The antennae and mandibulae are scarcely dif- 

 ferent from those of E. norv., while the maxillulac, as pointed out by Farran, possess, in the Le 9 

 bristles, of which the 2 proximal are moderately short; the Basp. Ill has four setae and the three seg- 

 ments of Ri have three setae each. The maxillae and maxillipeds are like those of E. norv., but the 

 latter differ by the more slender spines of Ri. 



The articulation between the Re I and II of pes I is anteriorly indicated outwards, and posteri- 

 orly inwards; the Se Re I is represented by a small protuberance. The Se Re II 

 pes II extends almost to the tip of Se Re III, and the Se 2 extends just to the 

 base of Se 3. 



The shape of the epistoma is scarcely different from that of E. norv. 

 The anterior surface of the labruvi has the hairs somewhat differently placed; 

 anteriorly, in the middle, a transverse row of short hairs is found, in addition to a 

 more lateral group of rather long setae; laterally and more posteriori}- an area 

 Text-fig. 55. Euchste covered with densely placed short spines is observed. The oral surface of the 



^ "^ ' ■ ■ labrutn and the labial lobes are scarcely different from E. norv., and the area in 



Abdomen X 16. 



front of the lamina lahialis only differs by less regular lateral groups of hairs. 



Occurrence. The Ingolf Expedition has not taken this species, but it has been gathered by 



the Thor at the following stations. 



"/; 1904 St. 183 6i°30 L. N. i7°o8 L. W. Yt. 1800 M.Wire i f?. 



'5/6 1905 St 82 5i°oo L.N. ii°43 L. W. Yt 1200 M.Wire 3 f ?. 



8/6 1905 St. 72 57°52 L. N. 9°53 L. W. Yt 1500 M. Wire i f ?. 



2°/6 1905 St 88 48°09 L. N. 8°30 L. W. Yt 300 M. Wire 5 f? (2 with sperm). 



^761905 St 90 47°47 L. N. 8°ooL. W. Yt 300 M. Wire 2f?. 



This species "was taken in small numbers on five stations at from 350 to 700 fathoms" off the 

 west coast of Ireland. It has also been gathered by the Prince of Monaco and the Gauss at several 

 stations in the Mid-Atlantic. 



Remarks. This species is probably identical with Sars^ E. gracilis, as no difference was found 

 between my specimens and Sars' rather incomplete description. From A. Scott's description it differs by 

 the shorter antennulae and the hairy ventral surface of the abdominal somites III— IV. From Wolf endeu's 

 description of most of his specimens it differs by 9 instead of 7 setae in Le of the maxillulae, and by 

 the comparatively shorter Se 2 Re III pes II; as, however, one of Wolf en den's specimens had compara- 



