22 6 COPEPODA 



Description. Size of female from Thor St. 183 was 83 mm.; anterior division 6-5 mm.; urosome 

 i-8 mm. Wolfenden's specimens measured 8-8 mm. 



The body is rather elongated; the head (fig. 5 a) is well raised, with distinct eyes, but without 

 trace of frontal keel or spine. The rostrum (PI. VIII fig. 16 a) is bifurcate, with fairly long, slightly 

 divergent spines, one of which, at least, possesses a slender filament. The lateral corner is triangularly 

 produced, and has a well marked pointed tooth, which in some specimens, however, is only indicated, 

 but is generally most distinct 011 the right side. 



The abdomen (PI. VII fig. 5b) is scarcely one third as long as the anterior division; the genital 

 somite is rather suddenly produced below; the genital opening is more broad than long, and is placed 

 in the middle of a densely hirsute area; the lateral margins are somewhat overlapping and pointed in 

 front; an elongated receptaculum seminis is found. The anal somite is scarcely visible from above; the 

 comparative length of the three first abdominal somites and the furcal branches is 32, 22, 16 and 11. 

 The marginal serrated seam along the hinder margin of segments 2 — 4 is only poorly developed. 



The somites are more or less hirsute, especially ventrally; the first somite has the hairs more 

 distinct, especially dorsally in front, where a pad of densely placed hairs is found. 



The antennulae reach almost to the end of the body and consist of 24 segments the appendages 

 are scarcely different from those of C. chelifer; the Sp. of segment 24 is one third removed from the 

 end of the segment, and is far from reaching the tip of the segment 25. The segments 21 and 22 are 

 of almost equal length. The exopodite and the endopodite of the antennae are of almost equal length ; 

 the mandibulae and maxillulae are in main features like those of C. chelifer. The basipodite of the 

 maxillae is first strongly excavated and then distinctly produced; the lobe 1 has 5 setae, the lobes 

 2 — 4 have 3 setae ; the posterior seta of the fourth lobe is stronger than the preceding setae, but much 

 weaker than the strong curved spine of the fifth lobe, at the base of which 3 fairly long and slender 

 setae are found. The endopodite has 6 brush-shaped sensory organs in addition to a long slender one. 

 The maxillipeds show great similarity to those of C. chelifer; the comparative length between the 

 main divisions is 18, 29 and 15. The first and second basipodites are like those of C. chelifer; the third 

 basipodite is about 6 times as long as wide, with the three proximal setae well separated from each other; 

 and inwards and basally with an area of densely placed delicate spines. The second segment of the endo- 

 podite has one short serrated curved spine and two long ones; the third segment has two similar spines. 



The first pair of legs is like that of the preceding species, but the segments are much more 

 slender. The second pair of legs is like those of the preceding species, but is distinctly more slender ; 

 the third outer segment is about twice as long as wide, and as long as the terminal spine. The outer 

 spine of the first inner segment is fairly long and somewhat obtuse; on the anterior surface of the second 

 inner segmentTa small pore surrounded by slender hairs is found ; indistinct glandular pores were only 

 found in Re II and at the base of Se 3 Re III. On the posterior surface of the two inner segments 

 coronas of spines were found, while larger and smaller prickles were found in numbers in the outer 

 segments. The third pair of legs differs from the following pair by the comparatively longer and 

 thicker teeth, especially in the endopodite. The fourth pair of legs has marginal setae in the second 

 basipodite; a glandular pore is observed in the second outer segment; the posterior surface is covered 

 with groups of short prickles or fairly long setae, with all intermediary steps between; the setae are 



