. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Marine Copepoda 37 k the caudal setse, although a figure by Sars shows them slightly enlarged. A similar condition, again, still more pronounced, is figured by Sars for Amphiascus giesbrechti, but here the protuberance is directed outwards. Whatever may be the significance of this small tubercle on the caudal setae, it is of some interest to find it occurring in three different genera. 29. Amphiascus nasutus (Boeck). Station 41n. See under Dactylopusia signata. Station 43e. See Table VII. This is, for its size, a stout
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Marine Copepoda 37 k the caudal setse, although a figure by Sars shows them slightly enlarged. A similar condition, again, still more pronounced, is figured by Sars for Amphiascus giesbrechti, but here the protuberance is directed outwards. Whatever may be the significance of this small tubercle on the caudal setae, it is of some interest to find it occurring in three different genera. 29. Amphiascus nasutus (Boeck). Station 41n. See under Dactylopusia signata. Station 43e. See Table VII. This is, for its size, a stout harpacticoid with heavily built cylindrical urosome. Length of female, 1-22 mm., of male, 0-72 mm. Caudal ramus truncate, shorter than anal segment (Fig. 53). **'l'1^l/VV/l/l/l/V/v,>^„^^.,.,^.,^^^^^,y.^„j>iM. Fig. 53. Amphiascus nasutv^. Anal segment and furca from below. Anterior antennae distinctly 9-jointed, the proportional lengths of the joints being: 7, 5, 5, 7, 2, 3, 1-5, 2, 4. Posterior antennae with Re three-jointed, the middle joint short; Re 1 with one seta. Re 2 achaetous. Re 3 with one proximal and two strong apical setae with several setules around their bases. Second maxilliped with the si of the hand arising towards the distal end of the joint. Thoracic legs: p 1 with both rami three-jointed as in Dactylopusia, but the si of Ri 1 is inserted near the distal end of the joint (Fig. 54).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Canadian Arctic Expedition (1913-1918). Ottawa, F. A. Acland, Printer to the King
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
