. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 12 K Canadian Arctic Expedition, 1913-18 terminal setae of the natatory legs in the original description are cultriform, dilated in the middle. Owing to the state of preservation of the specimen at my disposal, I can say nothing on this point. The length was 1-52 mm., the anterior antennse were broken. Relative lengths of anal segment and caudal furca: anal segment 9, furcal length 15,. Fig. 3. Eurytemora gracilis 9 . Urosome from above. Fig. 4. Same. Part of fifth leg. width of caudal ramus 2; surface of caudal rami s
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 12 K Canadian Arctic Expedition, 1913-18 terminal setae of the natatory legs in the original description are cultriform, dilated in the middle. Owing to the state of preservation of the specimen at my disposal, I can say nothing on this point. The length was 1-52 mm., the anterior antennse were broken. Relative lengths of anal segment and caudal furca: anal segment 9, furcal length 15,. Fig. 3. Eurytemora gracilis 9 . Urosome from above. Fig. 4. Same. Part of fifth leg. width of caudal ramus 2; surface of caudal rami smooth (Fig. 3). In the last pair of legs (p. 5), the distal joint was lost; the unguiform process of the proximal joint of the Ramus (Re 1) projects nearly horizontally inwards, abruptly narrowing to a distal acuminate portion which is ciliated on the inner edge (Fig. 4). Genital segment with lateral convexities separated by a constriction (Fig. 3). 10. Eurytemora herdmani I. C. Thompson and A. Scott, 1898. This is one of the most typical and abundant Copepods of the gulf of St. Lawrence. It was first obtained in 1897 by Prof. W. A. Herdman, who collected surface plankton through the ship's pump continuously day and night whilst the steamer was going at full speed across the Atlantic. Though not previously observed on the Pacific coast, it was taken at a number of stations by the Can- adian Arctic Expedition: Tables I, II, \T, VII, IX, station 42p (under Pseudocalanus), and the following. Station 17 a,b,c: 60° 9' N., 167° 38' W., three surface hauls, with net number 3, fifteen minutes each, preserved in one vial, July 6, 1913. Numerous small copepods, mostly adult cf, some young forms, but not one female. Table XI (Sta. 17a, b, c.) Eurytemora herdmani cf 45 Acartia J 45 Tortanus discaudatus <? 10 100 Probably both Acartia longiremis and A. clausi are present in subequal numbers, but as the metathoracic thorns of longiremis may be lost or worn down, it is not safe to differ
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