. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 82 COPEPODA was found in the three segments of the exopodites in the three last pair of legs, but in the position of the pores, especially in Re I—II, it is most like Ch. armatus, as these are placed on tlie anterior surface, well removed from the lateral margin. Occurrence. This species was taken by the S/S Thor at the following 3 stations viz: "/; 1904. St 183. 6i°3o L. N. i7°o8 L. W. Yt. 1800 M. Wire i f?. 8/6 1905. SL 72. 57°52 L. N. 9°53 L. W. Yt. 1500 M. Wire 2 f?. V9 1905. St. 167. 57°46 L. N. 9^55 L. W. Yt. 1500
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 82 COPEPODA was found in the three segments of the exopodites in the three last pair of legs, but in the position of the pores, especially in Re I—II, it is most like Ch. armatus, as these are placed on tlie anterior surface, well removed from the lateral margin. Occurrence. This species was taken by the S/S Thor at the following 3 stations viz: "/; 1904. St 183. 6i°3o L. N. i7°o8 L. W. Yt. 1800 M. Wire i f?. 8/6 1905. SL 72. 57°52 L. N. 9°53 L. W. Yt. 1500 M. Wire 2 f?. V9 1905. St. 167. 57°46 L. N. 9^55 L. W. Yt. 1500 M. Wire 2 f?. Remarks. This species, which on account of its small size, the prominent rostrum, and the curious arrangement of the secretory pores is well distinguished fron; C/i. armatus, is certainly new to science, as in the literature I have only found a single reference to a species of the Ch. armatus type of a size of 2'65 mm. (viz. Far ran 1905 p. 34). 18. Chiridius modestus n. sp. (PI. II fig. 5; te.\t-figs 19 a—c). Description, f?. Size: Specimen from St. 183 measured 3-69 mm.; anterior division 270 mm., urosome 0-99. The rostral spines are longer and more prominent tlian in Cli. arinaius, but less so than in nastihis (text-fig. 19 b). The outline of the head is anteriorly not fairly rounded as in Ch. armafus, but distinctly produced (text-fig. 19 a). The frontal organ is prominent, and the distance between it and the base of the rostrum is short / and straight, not slightly concave as in the two other species. The cephalothorax, which is 2'5 times as long as wide, is scarcely 3 times as long as the The genital somite, which has a receptaculum seminis of the usual structure, is about 1-3 times as long as the third somite, and 17 as long as the fourth (text-fig. 19 c); the furcal rami are i-6 as long as wide, and 1-4 as long as the anal somite, which is a little longer than the furca; the latter somite is scarcely half as long as the third one. The a
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