. Conditions of life in the sea; a short account of quantitative marine biological research. Marine biology. 68 LIFE IN THE SEA [part I Pluteus larva of Echinus esculentus. Fig. 18. Plankton: fishes, worms, &c. 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 Johnstone, James, 1870-1932. Cambridge, University press

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