Archive image from page 234 of The depths of the sea;. The depths of the sea; an account of the general results of the dredging cruises of SS. 'Porcupine' and 'Lightning' during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, J. Gwyn Jeffreys, and Dr. Wyville Thomson depthsofseaaccou02thom Year: 1874 CHAP. IV.] THE rnursEs of the 'porcupine: 187 Northern Asia, by supposing a migration through Fig. 'W.—Chondrocludui v'lrgtild, \V\ ville Thomson. One-half the natural size. (No. 'i'i, PI. V.) the Arctic Sea. A¥e must know, however, much

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