. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 156 COPEPODA The lamina labialis does not show any features of interest (fig. 2 d); the area in front of it is most like that of Chiridiiis\ it consists of a lateral, somewhat convex, row of fairly long setae and two median, well separated, groups, as shown in fig. Behind the lamina and between the labial lobes, which were not studied in detail, no setae were observed. Y(i" (St. V). Size of specimen from St. 183 was 9 mm.; anterior division 6-5 mm.; urosome 2*5 mm. The shape of the body is in main respects like that of
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 156 COPEPODA The lamina labialis does not show any features of interest (fig. 2 d); the area in front of it is most like that of Chiridiiis\ it consists of a lateral, somewhat convex, row of fairly long setae and two median, well separated, groups, as shown in fig. Behind the lamina and between the labial lobes, which were not studied in detail, no setae were observed. Y(i" (St. V). Size of specimen from St. 183 was 9 mm.; anterior division 6-5 mm.; urosome 2*5 mm. The shape of the body is in main respects like that of the females, but the lateral corner of the thorax has a small tooth; of the four abdominal somites the second is longer than the third, which is as long as the first. The measurements of the antennulae are somewhat different; the segments 17 and 19, which are of equal length, are 1-24 as long as 24'>^25, and 2-5 as long as segment 14. The other appendages do not seem to show differences of any importance; the Re of the maxillulae pos- sess, as usual in this stage, only 10 setae. The pes V of the male is somewhat like that of Euch3 25, which is 1-2 as long as 17. The mouth appendages, except the maxilltilae, are practically like those of the adult; the Le had in the single specimen examined a single proximal long seta and 3 very delicate hairs distally; the Li I has only 10 setae, and the Re as usually 8. The pes I differs distinctly from that of the adult by the more slender form especially of Ri; both branches are undivided; the 3 Se are well developed, and a glandular pore is found in the third division. The pes II has both branches unsegmented; the Re I—III has 6 Si and 4 Se; only at the base of Se 3 Re III is a glandular pore found. The/rj IV \s comparatively more slender than pes II; the Re I <Ni III have 3 Si and 3 Se, and a single glandular pore; the Ri I-^ III have 6 setae altogether. In lateral view the labrum and labial appendages are scarcely different from t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1915
