. L'histoire naturelle. Zoologie. Les puces d'eau. 531 l'a mentionné, les Européens se tournent contre les insectes, etc., avec dégoût, -wliile manger des crabes et crevettes sans hésitation. La nourriture n'est plus une affaire de mode que de toute autre chose, après tout. Une théorie plus ingénieuse a été récemment proposée par M. H. M. Bernard, dans son travail sur l'Apodirhe. Il considère la Ch-ustacea comme provenant de l'Amielida, et que le plus tôt les crustacés étaient simplement Annelida avec la tête penchée vers le bas sous le corps ; mais c'est une question à laquelle seuls les spécialistes ont le droit d'exprimer une opinion. Néanmoins, nous pouvons commencer la

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. Natural history. Zoology. WATER-FLEAS. 531 mentioned, Europeans turn from insects, etc., with disgust, -wliile eating crabs and shrimps without hesitation. Food is more a matter of fashion than of anything else, after all. A most ingenious theory has lately been propounded by Mr. H. M. Bernard, in his work on the Apodirhe. He considers the Ch-ustacea to have originated from the Amielida, and that the earliest Crustacea were simply Annelida with the head bent down under the body ; but this is a matter on which only specialists are entitled to express an opinion. Nevertheless, we may begin the Crustacea with the Entomostraca, as the grovip nearest ap- proaching to the Annelida. We may add that the Pycnogonida, which we have included with the AracJmida, have been placed by some authors in the Crustacea, while others have regarded them as forming a distinct class of Arthropoda by themselves. SUB-CLASS I.—ENTOMOSTRACA. This large section is only retained as a matter of convenience to include the smaller Crustacea, many of which exhibit forms which have little resemblance to the more typical Crustacea. It includes most of the parasitic species. The Cirripedia are sometimes treated as an additional order of Entomosto-aca. Oedee I.—Phyllopoda. The Phyllopoda have received their name from their leaf-like swimming legs, of which there are four pairs, or more. Sometimes more or less of the animal is covered by a bivalve shell, somewhat as in the Ostracoda, or by a. Jiff. 2.—Water-Flea (Daphnia pulex). Magnified.. 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 work.. Lydekker, Richard, 1849-1915; Kirby, W. F. (William Forsell), 1844-1912; Woodward, Bernard Barham, 1853-1930; Kirkpatrick, R. (Randolph), b. 1863; Pocock, R. I. (Reginald Innes), 1863-1947; Sharpe, Richard Bowdler, 1847-1909; Garstang, Walter,

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