﻿170 



COPEPODA 



The antennulae extend about to the middle of the abdomen; the segments 12—13 are posteri- 

 orly fused, not only on the right but also on the left side, "^^isthetasken" are found in all segments 

 except 23, even in the segment 20, in which they are wanting in E. norvegica. The measurements are 

 only in minor details different from those of the female. The interior lobe of the Ri of the antennae 

 has medially, in addition to the 5 + 2 setae, an extremely delicate one. The viandibulae and maxillae 

 scarcely differ from those of E. norvegica. The maxillulae are, as seen in fig. 5 c PI. VI, better developed 

 than in other species; the Li i ha.s, f. inst, 9 fairly long setae, and so has the Ri. The maxillipeds are 

 like those of E. norvegica., but the usual hooked process of lob. IV Basp. II seems to be represented 

 by a rather slender, straight, conical process. 



Text-fig. 47. Euchatc glacialis H. J. Hansen, 

 a— c. f9. Left lateral corner in three specimens; most setae missing X 18. d— e. fQ. Pes I dext in anterior and posterior 

 view X 57- f- f d"- Left lateral corner X 18. g. f d". Pes V Ri sin. in internal view, h— i. VcJ — 9 (stage V). Abdomen X 16. 

 j. Yc? (st V). Furca X 18. k. Yd" (st. V). Pes V X 33- 1— m. Ytf- 9 (st. IV). Abdomen X 16. n. Ycf (st. V). Pes V X 89. 



Pes I has the articulation between the Re I — II better developed than in the female, but the 

 Se of Re I is wanting; the pes II shows a similar sexual difference. 



Pes F dext. has, about in the middle, an almost complete articular line between Re I and II; 

 proximally to this a short tooth is found exteriorly, which is indicated in E. norvegica; the Re III is 

 terminally somewhat hollowed, and less widened. The Re II — III pes V sin. are distinctly shorter; the 

 ringed appendage is comparatively short, and the serrated process is moderately hollowed between the 

 two rows of teeth ; the left endopodite has only one single segment (text-fig. 47 g). 



Yq (St. V). Size of specimen from Thor 1904 St 154 was 771 mm.; anterior division (3'5i -}- 2'3) 

 = 5'8i; urosome 1-9 mm. Hansen's specimen measured 7 mm. 



This stage is easily distinguished from the corresponding stage of E. norvegica by the more 

 obtusely pointed lateral corner of the fifth thoracic somite (text-figs 47 h— j). The differences in the 



