. The Cambridge natural history. Zoology. 58 CRUSTACEA—COPEPODA- ill the species figured, Calocalmms plumulosus (Fig. 26), from the Mediterranean. Sars makes a curious observation ^ with regard to the distribution of certain Calanidae. He reports that along the whole route of the "Fram,". ^«-+-<r<^ species such asCalanus hyperhoreus and Eucli- aeta norivegica were taken at the surface, which, in the Nor- wegian fjords, only occur at depths of over 100 fathoms. He suggests that the Nor- wegian individuals, instead of migrating northwards as the warmer climate super- vened, have
. The Cambridge natural history. Zoology. 58 CRUSTACEA—COPEPODA- ill the species figured, Calocalmms plumulosus (Fig. 26), from the Mediterranean. Sars makes a curious observation ^ with regard to the distribution of certain Calanidae. He reports that along the whole route of the "Fram,". ^«-+-<r<^ species such asCalanus hyperhoreus and Eucli- aeta norivegica were taken at the surface, which, in the Nor- wegian fjords, only occur at depths of over 100 fathoms. He suggests that the Nor- wegian individuals, instead of migrating northwards as the warmer climate super- vened, have sought boreal conditions of temperature by sinking into the deeper waters, TRIBE II. HETERARTHRAN- DRIA. The first antennae of the male are asym- usually the right, being used as a clasping organ. The males of the Centropagidae, Candacidae and Pontellidae, besides possessing the asymmetrically modified thoracic limbs of the fifth pair also exhibit a modification of one of the first antennae, which is generally thickened in the middle, and has a peculiar joint in it, or geniculation, which enables it to be flexed and so used as a clasping organ for holding the female. Fam. 1.—Centropagidae.—These Copepods are very common in the pelagic plankton, and some of the species vie with the ' Nonvegian North Polar Exp. Sci. EesuUs, vol. i. part v., Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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