COPEPODA 



223 



Description. f$. Size of female from Thor St. 183 was 87 mm; anterior division 67 mm.; uro- 

 some 2111111. Wolfenden's specimens measured 8 mm. 



The head has a low terminal crista with a dorsal spine directed forwards and downwards (PI. 

 VIII fig. 15 a). The rostrum is bifurcate with the spines directed downwards and backwards, each 

 bearing terminally a slender backwards curved filament. The shape of the body is like Wolfenden's 

 figure; the articulation between the head and first thoracic tergite, as well as between the fourth and 

 fifth tergites is well developed; the lateral corners are somewhat triangularly produced, are rounded 

 and possess a small tooth (PI. VII fig. 4 a). 



The abdomen, which is about one third as long as the anterior division, has a serrated seam 

 along the hinder margin of somites II IV; the somites, especially the genital one, are all over covered 

 with short hairs or spines. The genital somite, which is a little longer than deep, is distinctly pro- 

 duced below ; the receptaculum seminis is, as seen in fig. 4 a, well developed. The fifth abdominal 

 somite is scarcely visible from above, the comparative length between the three first somites and the 

 furcal branches, which are wider than long, is 35, 22, 17 and 10. The St 2, at the base of which a 

 dorsal tooth is seen, is almost half as long as the body and twice as long as the other setae. 



The antcnnnlac, which scarcely extend to the end of the cephalo-thorax, consist of 24 segments. 

 "^Esthetaskeu" are found in segments 2, 3, 5, 7, 9, 12, 14, 19 and 25, as well as in segments 18 and 21, 

 but here representing the distal seta. A proximal seta was found in segment 12 as well as in segments 

 14 18. The Sp. of segment 23 is well removed from the tip of segment ( J / 4 r / 5 of its length), and 

 extends scarcely to the end of segment 25. The segment 21 is 1-3 as long as segment 22. 



The endopodite of the antennae is two thirds as long as the exopodite; its second segment has 

 8 setae in the inner lobe and 6 in the outer lobe. The manducatory part of the mandibulae is long 

 and slender, with fairly well developed teeth; the third basipodite, which is about as long as wide, 

 has three setae inwards; the second segment of the endopodite has 9 Sp. 



The Lob I of the niaxillulae is long and slender; the Li 2 has two long plumous setae, the 

 Li 3 has 4 setae, and the third basipodite has 4 Sa and i Sp. The Ri I has 3 setae, the Ri II has 3, 

 of which one is very delicate, and the Ri III has 4 setae. The exopodite has 10 setae and two groups 

 of short spines on the anterior surface; the Le has 7 + 2 setae. 



The maxillae and maxillipeds have a very characteristic structure, but are scarcely different 

 from Wolfendeu's figure. 



The first pair of legs is like Wolfenden's figure; the segments are broad, and the exopodite 

 has 3 segments with powerful outer setae; the endopodite has 3 fairly long spines on the posterior 

 surface; the exopodite has on the posterior surface of Re II at the base of Si five slender spines, and at 

 the base of Si I Re III two spines. A glandular pore is found beyond the middle in the outer margin 

 of Re III. The second pair of legs is like Wolfenden's figure, but the segments are comparatively 

 longer; the first inner segment is produced into a fairly long, somewhat rounded, spine; the armature 

 of the posterior surface is scarcely different from Wolfenden's description. The St has the serrations 

 almost completely fused in the distal three fourths, but only fused in the middle in the proximal fourth, 

 leaving a basal fenestra free. Small glandular pores were found at the base of Se Re I and II, and 

 at the base of Se i and 3 of Re III. The third pair of legs is in main features like fa& fourth pair; 



