. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 52 COPEPODA 7. Eucalanus Attenuatus? Dana. (PI. I figs. 6 a —c; text-figs. 10 a—e). 1849. Calanus attenuatus n. sp. Dana. Eucalanus attenuatus Dana. Dana. 1S92. — — — Giesbrecht, pp. 131. 1894. — — — Th. Scott, pp. 28—29. 1S95. — — — Giesbrecht, p. 24S. 1898. — — '— Giesbrecht & Schmeil, pp. 20—21. 1901. — — — Cleve, p. 6. 1903. — — — Norman, p. 135. 1903. — — — Cleve, p. 362. 1900. — — — Wheeler, p. 167. 1903. — — — J. C. Thompson & A. Scott, pp. 242. 1903. Eucalanus attenuatus Dana. J. C. Thompson, p. 15. 1905- 190
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 52 COPEPODA 7. Eucalanus Attenuatus? Dana. (PI. I figs. 6 a —c; text-figs. 10 a—e). 1849. Calanus attenuatus n. sp. Dana. Eucalanus attenuatus Dana. Dana. 1S92. — — — Giesbrecht, pp. 131. 1894. — — — Th. Scott, pp. 28—29. 1S95. — — — Giesbrecht, p. 24S. 1898. — — '— Giesbrecht & Schmeil, pp. 20—21. 1901. — — — Cleve, p. 6. 1903. — — — Norman, p. 135. 1903. — — — Cleve, p. 362. 1900. — — — Wheeler, p. 167. 1903. — — — J. C. Thompson & A. Scott, pp. 242. 1903. Eucalanus attenuatus Dana. J. C. Thompson, p. 15. 1905- 1905. 1905. 1906. 190S. 1908. 1909. 1911. 1910. 1912. Wolfenden, p. 996. G. O. Sars, p. 2. Esterly, p. 133, figs. 7 a—c. Pearson, p. 7. Farran, p. 22. V. Bremen, p. i5, fig. 12. O. Pesta, p. 21. O. Pesta, p. 20. Steuer, p. 21. Sewell, p. 357. Description y$. (Stage V). Length: anterior division 3-34 — 1-26 = 4'6; nrosome 058; total length 5-18 mm. Tlie head i text-figs. 10 a —b) is like that of Rhincalanus ?iasutus triangularly produced in •' '' " lateral as well as iu dorsal view. The fifth thoracic somite (text-fig. IOC —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 urosomi\ 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1915
