. Copepoda. Calanoida; Copepoda. 52 COPEPODA 1849. 1892. 1894. 1895. 1898. 1901. 1903. 1903. 1900. 1903. 7. Eucalanus Attenuatus? Dana. (PI. I figs. 6 a—c; text-figs. 10a—e). Calanus attenuatus n. sp. Dana. Eucalanus attenuatus Dana. Dana. — — Giesbrecht, pp. 131. — Th. Scott, pp. 28—29. — — Giesbrecht, p. 248. — — Giesbrecht & Schmeil, pp. 20—21. Cleve, p. 6. Norman, p. 135. Cleve, p. 362. Wheeler, p. 167. J. C. Thompson & A. Scott, pp. 242. 1903. 1905. 1905. 1905. 1906. 1908. 1908. 1909. 1911. 1910. 1912. Eucalanus attenuatus Dana. J. C. Thompson, p. — — Wolfenden, p. 996. 15- G. O.
. Copepoda. Calanoida; Copepoda. 52 COPEPODA 1849. 1892. 1894. 1895. 1898. 1901. 1903. 1903. 1900. 1903. 7. Eucalanus Attenuatus? Dana. (PI. I figs. 6 a—c; text-figs. 10a—e). Calanus attenuatus n. sp. Dana. Eucalanus attenuatus Dana. Dana. — — Giesbrecht, pp. 131. — Th. Scott, pp. 28—29. — — Giesbrecht, p. 248. — — Giesbrecht & Schmeil, pp. 20—21. Cleve, p. 6. Norman, p. 135. Cleve, p. 362. Wheeler, p. 167. J. C. Thompson & A. Scott, pp. 242. 1903. 1905. 1905. 1905. 1906. 1908. 1908. 1909. 1911. 1910. 1912. Eucalanus attenuatus Dana. J. C. Thompson, p. — — Wolfenden, p. 996. 15- G. O. Sars, p. 2. Esterly, p. 133, figs. 7a—c. Pearson, p. 7. Farran, p. 22. v. Bremen, p. 16, fig. 12. O. Pesta, p. 2r. O. Pesta, p. 20. Steuer, p. 21. Sewell, p. 357. Description y$. (Stage V). Length: anterior division 3*34+ 1*26 = 4-6; urosome 0'58; total length 5-18 mm. The head (text-figs, ioa —b) is like that of Rhincalanios nasutus triangularly produced in a lateral as well as in dorsal view. The fifth thoracic somite (text-fig. 10 c—d) is fairly well marked out, especially dorsally, and its lateral corners are slightly produced and rounded. The rostral filaments (text-fig. 10 e) are long and slender, and placed on a long bifurcate basal portion. The ztrosome, which is scarcely one sixth as long as the anterior portion, consists of three somites. The first (I <^ II), which does not show any trace of receptacula seminis, is longer than the two following combined; the fourth somite is completely fused with the furca, which has the longer branch on the left side. The St. 2 sin. is distinctly longer and more powerful than the other setae. The structure of the mouth appendages and natatory legs scarcely shows differences of any importance from Giesbrecht's description; the Ri 2 of the maxillipeds has only 3 instead of 4 Si. No glandular pores were observed in the four pair of legs. The labrum is in lateral view like that of Euc. clongatus. Text-f
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