. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 220 COPEPODA 70. Scottocalanus securifrons Th. Scott. (PI. VIII figs 13 a—b; ;71 a—d, 72 a—e and 73a-d.) 1893. 9 nee. d- Scolecithrix secvirifroiis 11. sp. Th. Scott pp. 47-48, pi. IV-V. 1896. Scolecithrix securifrons Scott. Canu, p. 425. 1898. - — — Giesbr. & Schmeil, p. 49. 1903. pars. — — — Norman, p. 137. 1903. — — — J. C. Thompson, pp. 20—21. — — — Cleve, p. 197. 1904. Lophothrix — n. sp. Wolfenden, p. 120, pi. IX figs 12—15. 1905. Scottocalanus acutus a. sp. G. O. Sars, p. 7. igo6. ? pars. — s
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 220 COPEPODA 70. Scottocalanus securifrons Th. Scott. (PI. VIII figs 13 a—b; ;71 a—d, 72 a—e and 73a-d.) 1893. 9 nee. d- Scolecithrix secvirifroiis 11. sp. Th. Scott pp. 47-48, pi. IV-V. 1896. Scolecithrix securifrons Scott. Canu, p. 425. 1898. - — — Giesbr. & Schmeil, p. 49. 1903. pars. — — — Norman, p. 137. 1903. — — — J. C. Thompson, pp. 20—21. — — — Cleve, p. 197. 1904. Lophothrix — n. sp. Wolfenden, p. 120, pi. IX figs 12—15. 1905. Scottocalanus acutus a. sp. G. O. Sars, p. 7. igo6. ? pars. — securifrons Scott. Pearson, p. 19. 1908. — — — Farrau, p. 57. 190S. 9 nee. o" Scolecithrix securifrons Scott, v. Bremen, p. 76 fig. 88. 1909. Scottocalanus securifrons Scott. A. Scott, pp. 104—105 pi. XXV figs 1-9, pi. XXVIII figs 1—9. 1911, pars. Lophothrix securifrons Scott Wolfenden, p. Description. f$. Size of female from Thor .St. 82 was 449 mm.; anterior division (to the end of the lateral corners) 377 mm.; nrosome 072 mm. Th. Scott's specimens measured 4 mm. and A. Scott's 4-3 mm. The crista is scarcely different from that of the preceding species, bnt the lateral corners are triangularly produced into spine-like processes, which in dorsal view are seen to be directed somewhat outwards (text-figs 71 a—b). The rostrum has the basal portion elongate, with paral- lel margins; the divergent rami are short, without distinct tooth. The ge- nital somite is strongly swollen below, and it is distally produced into a strong process which overlaps the proximal half of the following somite. Along the hinder margin of somites II—IV a generally well developed serrated seam is observed (text-figs 71 a—b). The antenmilar are like those of the preceding species, but the articular membrane between segments %'^<^ and 10 are wanting posteriorly, and segments Sc^g have only one sensory seta (text-fig. 71 d). The oral appendages
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