COPEPODA 143 



pendent parallel rows; the third group as well as W\^ fourth and fifth has the inner rows of setae 

 in each group fairly well separated, but has the more laterally placed hairs of each group rather irre- 

 gularly placed. Behind and laterally to the fifth group on each side a large number of very delicate hairs 

 are found. The lateral group in front consists of numerous delicate short hairs. The transverse series 

 around and behind the median circular spot Nr. 4 is shown in fig. 4 b. 



The lamina labialis is minutely granular and, as seen in fig. 4 c, laterally prolonged backwards; 

 the lateral series in front consists, except posteriorly, of a single row; the medial series, in front of which 

 a minutely granular area is found, is fairly long. 



The arrangement of the series of hairs behind and upon the labial lobes is the following (fig. 

 4d): 'Ca.^ first series is almost longitudinal and consists of 10 hairs; the second series consists of a 

 group of about 10 hairs; the third scries consists of two well separated transverse rows, well removed 

 from the longitudinal row upon the labial lobe; in front of the two mentioned transverse rows 2 others 

 are observed, which probably belong to the fourth series; this is well developed upon the lobe and 

 has proximally a large group of numerous hairs, partly belonging to the fifth series, which medially 

 has a transverse row. In at least one of the specimens several of the hairs are slightly clavate. Behind 

 the transverse line which separates the mandibular and maxillular somites, groups of hairs, as shown 

 in fig. 4 d, are found. 



A short but distinct frontal coecal sac is found. 



fc?. Size of specimen from Thor St. 88 was 3-80 mm.; anterior division 2-83 mm.; urosome 

 0-97. Scott's specimen measured 41 mm. 



The frontal keel and the rostrum are (as seen in PI. VIII fig. 5 a), somewhat different from those 

 of the female. The body is rather slender and attenuated towards the front, but less so towards the 

 end; the lateral corners are rounded. The anterior division is 3-8 as long as the abdomen, which has the 

 genital opening on the left side and short triangular teeth along the hinder margin of the second to fourth 

 somites. The antennulae extend scarcely to the middle of the abdomen; the segments 8<n>9 are almost 

 completely fused with 10 and 12 with 13, but the segments 20 and 21 are well separated on both sides. 

 The exopodite of the antennae, which is 1-4 as long as the endopodite, has in the first segment a 

 single process without setae, and in the second 2 basal processes and a single terminal one. The soft- 

 skinned manducatory part of the mandibulae has a single well developed tooth and a few rudimentary 

 ones, and the Ri 2 has 9 Sa, but not, as in female, a Sp. 



The maxillulae possess at least 6 soft sensory (?) appendages in Li i; the Li 2 was wanting, 

 but in Li 3 at least 3, in Basp. 3 at least 3, and in Ri at least 11 setae were found. The Re has 10 

 well developed plumous setae in addition to a delicate interior one, and Le has 2 short, delicate, basal 

 setae in addition to 5 distal, long ones. The maxillae (PI. VIII fig. 5 b) have 5 well developed lobes, 

 of which the fifth one bears a big twisted seta with enlarged base; the endopodite has at least 5 setae. 

 The maxillipes is more clumsy than that of the female, in shape ressembling that of the males of Und- 

 euchate; the third basipodite is 1-3 as long as the two first ones and 2-5 as long as Ri; the lob. IV of 

 the second basipodite has a long, slender seta and a rather short, curved, spine-like one in addition to 

 the usual conical one. 



"TV^ first pair of legs differs from that of the female by the very short Se of Re I; the Se of 



