COPEPODA 



127 



Remarks. The male of this species is very similar to E. pulchra Giesbr., while the female seems 

 to be nearly related to E. venusta Giesbr., but is distinctly different by the shape of the genital somite, the 

 larger size, the much longer endopodite of the antennae with greater number of setae and the single 

 spine in the second basipodite of the fourth pair of legs. It is possibly identical with Wolfenden's 

 E. gracilis (p. 237 1911) from the South Atlantic, which agrees with it in several of these characters, as 

 far as can be seen from the short description, but as the genital somite in dorsal view has a different 

 outline and laterally is "ohne Auswuchse", and as the endopodite of the antennae has 8 + 7 terminal 

 setae, I feel justified in regarding my species as a new one. Between Wolfenden's description of a 

 young male of E. carinata and this species there is some similarity. 



In spite of the somewhat curious difference found in the number of setae in the endopodite of 

 the antennae I do not doubt that the young specimens belong to the same species. In all features of 

 importance, even the wanting glandular pore in Re I of pes III — IV, they aggree with the females. 



In several respects this species bears similarity to E. curticauda Giesbr. 



35. Euchirella maxima Wolf. 

 (PI. IV figs 5 a — h ; Text-figs 33 a — i. 



1905. Euchirella maxima n. sp. Wolfenden, p. 18, pi. VI figs 



9— 11. 

 1908. — — Wolf. Farran, p. 38. 



1909. Euchirella maxima Wolf. A. Scott, pp. 57 — 58, pi. XII 



figs 12 — 20. 

 1911. — Wolfenden, pp. 238 — 239, taf.28 



figs 3 — 5; text-figs 24 a — b. 



1% Size of specimen from Thor St. 88 was 7*8 mm: v anterior division 6-5 mm.; urosome 13 mm. 

 A specimen from Thor St. 167 measured 8-5 mm. Wolfenden's specimen measured 7-5 — 87 mm. 



The head is mounted with a well marked frontal keel. The rostrum is short, undivided and 

 in lateral view almost triangular. The first thoracic tergite is fused with the head. The fifth thoracic 

 tergite is, as stated by Scott, well separated from the fourth; it is narrow above, but below it is widened 

 out, and on the left side produced into an irregular, rounded lamina (fig. 5 b), but on the right produced 

 into a somewhat shorter pointed process (fig. 5 c) ; this interesting structure, which is rather variable 

 within the different specimens, has not been described by previous authors. The articular membranes 

 of the thoracic tergites are developed in a similar way as in E. curticmida. The abdomen is only one 

 fifth of the anterior division; the somites are short and dorsally along the hinder margin have short bristles. 

 The lower surface of the genital somite (fig. 5 d) is produced, and has, somewhat in front of middle, on 

 the left side, a prominent pointed process, which is curved forwards and inwards. On the left side and 

 behind, a small protuberance, scarcely visible from above, is seen, and on the right a small anterior 

 process and a fairly prominent bigger one, which is placed more posteriorly and is partly visible in 

 dorsal view. The furcal rami are about as long as wide. 



The antennulae reach about to the end of the genital somite; the segment 17 is about as long 

 as segment 2 and 1-6 as long as segments 8^9 and segments 24 — 25. The endopodite of the antennae 

 is only r / 3 of the exopodite; its Le of the second segment has only 3 moderately long almost naked 

 setae, and the Li has 5 somewhat shorter ones (the number of setae is according to Wolfenden as well 

 as to Scott 5 + 5); the Re I— II is distinctly longer than Re III— VII; the Re I, which has a pro- 



