. Copepoda. Calanoida; Copepoda. 220 COPEPODA 70. Scottocalanus securifrons Th. Scott. (PI. VIII figs 13 a—b; text-figs^i a—d, 72 a—e and 73 a- d.) 1893. 0 nee. <3. Scolecithrix securifrons n. sp. Th. Scott pp. 47—48, pi. IV-V. 1896. Scolecithrix securifrons Scott. Canu, p. 425. 1898. — Giesbr. & Schmeil, p. 49. — Norman, p. 137. — J. C. Thompson, pp. 20—21. Cleve, p. 197. n. sp. Wolfenden, p. 120, pi. IX figs 12 — 15. 1903. pars. - 1903. 1904. Lophothrix 1905. Scottocalanus acutus n. sp. G. O. Sars, p. 7. pars. — securifrons Scott. Pearson, p. 19. 1908. — — Farran, p. 57.
. Copepoda. Calanoida; Copepoda. 220 COPEPODA 70. Scottocalanus securifrons Th. Scott. (PI. VIII figs 13 a—b; text-figs^i a—d, 72 a—e and 73 a- d.) 1893. 0 nee. <3. Scolecithrix securifrons n. sp. Th. Scott pp. 47—48, pi. IV-V. 1896. Scolecithrix securifrons Scott. Canu, p. 425. 1898. — Giesbr. & Schmeil, p. 49. — Norman, p. 137. — J. C. Thompson, pp. 20—21. Cleve, p. 197. n. sp. Wolfenden, p. 120, pi. IX figs 12 — 15. 1903. pars. - 1903. 1904. Lophothrix 1905. Scottocalanus acutus n. sp. G. O. Sars, p. 7. pars. — securifrons Scott. Pearson, p. 19. 1908. — — Farran, p. 57. 1908. 9 nee. c? 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. 268. Size of female from Thor St. 82 was 4-49 mm.; anterior division (to the end 377 mm.; nrosome 072 mm. Th. Scott's specimens measured 4 mm. and. Description. f of the lateral corners) A. Scott's 4-3 mm. The crista is scarcely different from that of the preceding species, but the lateral coruers 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 antennulae are like those of the preceding species, but the articular membrane between segments 8cog and 10 are wanting posteriorly, and segments 80^9 have only one sensory seta (text-fig. 71 d). The oral appendages are scarcely different from those of the preceding species. The natatory legs are ver
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