. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 187 tively long antennulae and comparatively short Se 2 there is reason to suggest that the value of these characters ought not to be exaggerated. 57. Euchaete acuta Giesbrecht. (PL VI figs 12 a—c; text-figs 56 a—b.) 1892. Euchtete acuta n, sp. Giesbrecht, p. 246, Taf. 16 and 37. I 1905. Euchfete acuta Giesbr. Esterly, p. 157 fig. 23. i»9». 1903. 1903- 1904. 1904. 1905. 1905. Giesbr. Giesbrecht & Schmeil, p. 38. J. C. Thompson, p. 18. J. C. Thompson & A. Scott, p. 244. Wolfenden, p. 111. Cleve, p. 190. G. O.
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 187 tively long antennulae and comparatively short Se 2 there is reason to suggest that the value of these characters ought not to be exaggerated. 57. Euchaete acuta Giesbrecht. (PL VI figs 12 a—c; text-figs 56 a—b.) 1892. Euchtete acuta n, sp. Giesbrecht, p. 246, Taf. 16 and 37. I 1905. Euchfete acuta Giesbr. Esterly, p. 157 fig. 23. i»9». 1903. 1903- 1904. 1904. 1905. 1905. Giesbr. Giesbrecht & Schmeil, p. 38. J. C. Thompson, p. 18. J. C. Thompson & A. Scott, p. 244. Wolfenden, p. 111. Cleve, p. 190. G. O. Sars, p. 4. Farran, p. 35. 1906. 1908. 190S. 1909. 1909. 1911. 1912. Pearson, p. 17. Farran, p. 40. V. Bremen, p. 51, fig. 56. A. Scott, p. 65, pi. XX figs 1-9. Pesta, p. 23. Wolfenden, p. 299. Pesta, p. Text-fig. 56. Euchiete acuta Giesbr. Yc? (St. V). a. Abdomen X 18. b. Pes V in anterior view X 33- Description. i% Size: 4-02 mm.; anterior division (17 + 0-97) = 2-67 mm.; urosome 1-35 mm. Giesbrecht's specimen measured 4-1 mm., Farran's 4-4 mm. and Scott's 4-2 mm. The genital area has on each side of the vulva a lamina-shaped process, somewhat larger on the right side; the outline , as shown in fig. 12a, somewhat different from Giesbrecht's fig. 47 (Taf. 37). Scott's fig. 4 of the abdomen in dorsal view differs distinctly by the presence of a right lateral process (may possibly be the process on the right side of the vulva, which is visible when the animal is not examined in complete dorsal view). The subapical seta is much longer than the St. 2. The antennulae, mouth-limbs and natatory limbs are scarcely different from Giesbrecht's description. The epistoma and the anterior surface of the labrum do not show any features of interest. The hairs on the oral surface of the labrum show a rather simple arrangement. The group i is, as usual, placed somewhat laterally, but is not distinctly separated from the group 2; the groups 3—4 are small and well marked out; th
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