. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 109 Description, f^?. Size of specimen from Thor St 183 was 5-1 mm.; anterior division 4 mm.; urosome 11 mm. Sars' specimens measured 4-85 mm., Farran's specimens 5-1, Scott's 5-4 and Wolfenden's 37—4 mm. The frontal spine, which has a triangular base, has as seen in fig. 5 a the tip directed forwards and upwards. The distance between the base of the frontal spine and the frontal organs, which are placed on a small process, is almost straight with a low crest The rostrum is terminally bifurcate. The shape of the bod
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 109 Description, f^?. Size of specimen from Thor St 183 was 5-1 mm.; anterior division 4 mm.; urosome 11 mm. Sars' specimens measured 4-85 mm., Farran's specimens 5-1, Scott's 5-4 and Wolfenden's 37—4 mm. The frontal spine, which has a triangular base, has as seen in fig. 5 a the tip directed forwards and upwards. The distance between the base of the frontal spine and the frontal organs, which are placed on a small process, is almost straight with a low crest The rostrum is terminally bifurcate. The shape of the body is scarcely different from Farran's figure; the anterior division is 2-^ as long as wide and 3-6 as long as the urosome. The genital somite (fig. 5 b), which is distinctly 1-4 as wide as long and i"i as deep as long, has a fairly prominent receptaculum semiuis. The relative length of the abdominal somites and the furcal rami is the following: 42, 23, 19, 18 and 21; the furcal rami are I'l as long as wide. The atitcnnae, which have the Re about 1-3 as long as the Ri, have the Ri I almost twice as long as Re II, which is 17 as long as Re I, and a little shorter than Re VII. The Re I has a single terminal seta on a conical protuberance, and the Re II has 3 setae, of wliich the basal is the longest and like the median one is placed on small protuberances. The maxillulae possess 5 setae on Li II; the Li I has no spinules posteriorly and the Li III has none ante- riorly. The third basipodite of the inaxillipcds is 3 times as long as the endopodite and 1-3 as long as the first and second basipodites combined; the lamina of the second basipodite ( 26 b), which is folded in a characteristic way, is in the whole length faste- ned to the anterior surface of the segment; the inner margin of the third basipodite is basally not straight as shown in Farran's figure, but slightly convex as figured by Scott The first pair of legs has a well developed articulation between Re I
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1915
