Britannica 11th · 11th edition

Arthropoda

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OCR text aligned to scanned pagesVol. 2, pp. 287-2871910–1911

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This entry is linked to Encyclopaedia Britannica, 11th edition. The cited range is Vol. 2, pp. 287-287.

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ARTHROPODA. The Arachnida form a distinct class or line of descent in the grade Euarthropoda, diverging (perhaps in common at the start with the Crustacea) from primitive Euarthropods, which gave rise also to the separate lines of descent known as the classes Diplopoda, Crustacea, Chilopoda and Hexapoda. FIG. i. — Entosternum, entosternite or plastron of I.imulus polyphemus, Latr. Dorsal surface.