. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 31 1900. Calaiius hyperboreus Kroyer, G. O Sars, p. 2. 1901. 1902. 1902. 1903- 1903. 1903. 1904. Th. and A. Scott, pp. 338—339- Th. Scott, p. 450. Mrazek, pp. 506—507. Jensen, Johansen, Le- vinsen, p. 303. G. O. Sars, pp. 12 — 13, pi. V. Norman, p. 135. Wolfenclen, pp. 112. 1905. Calanus hyperboreus Kroyer, Th. Scott, p. 221. 1905. — — — G. O. Sars, p. i. 1907. — — — Damas & Koefoed, pp. 352—35S, 405. 1908. — — — Farran, p, 20. 1908. — — — V. Bremen, pp. 8—9, fig- 3- 1911. — — — Farran, pp. 89—90. 1913. — — — St
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. COPEPODA 31 1900. Calaiius hyperboreus Kroyer, G. O Sars, p. 2. 1901. 1902. 1902. 1903- 1903. 1903. 1904. Th. and A. Scott, pp. 338—339- Th. Scott, p. 450. Mrazek, pp. 506—507. Jensen, Johansen, Le- vinsen, p. 303. G. O. Sars, pp. 12 — 13, pi. V. Norman, p. 135. Wolfenclen, pp. 112. 1905. Calanus hyperboreus Kroyer, Th. Scott, p. 221. 1905. — — — G. O. Sars, p. i. 1907. — — — Damas & Koefoed, pp. 352—35S, 405. 1908. — — — Farran, p, 20. 1908. — — — V. Bremen, pp. 8—9, fig- 3- 1911. — — — Farran, pp. 89—90. 1913. — — — Stephensen, p. 71. 1913. — — — Stephensen, pp. 307— 30S. Description. f$. Size varies from 7-5—9 mm. The number of secretory pores differs from that of Calanus finmarc'nicjis by the presence of a "secretory pore", (not in all specimens, as far as I was able to find out) laterally a little removed from the base in Re III pes II in stead of corresponding to the wanting Se I; in pes III—IV the pore was found at the same place as in Cal. finmarchiciis, but was more distinct. In the serration of the second basipodite of pes V it is, as shown by Giesbrecht (taf. 8 fig. 21, 23), distinctly different from that of ^ in which species a serrated lamina is found; in Cal. hyperboreus the number of teeth are smaller (abotit 25—35) and they ar not fused basally. As far as the shape of the labrum etc. is concerned I refer partly to the description of the preceding species; only a few minor differences are dealt with here. The anterior process of the labrum is more produced (text-fig. 6 a (d)). In the longitudinal series on the oral surface (figs, i a —b) the two first groups are seen to be fused and are diverging towards the free margin. In front of the lamina labialis no granulation was observed. Behind the lamina labialis (fig. i c) and between the serrtila bidentata a dense group of hairs, medially mo
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