Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 FIG. 60. INSECTA - HOUSE FLY FIG. 61 ARA CHNIDA - SPIDER Figs. 57, 58, 59, 60, and 61.—Representatives of the five classes of Arthropoda. The arthropod characters are less conspicuous in the figure of Peripatus (Fig. 58) than in the others; the jointed structure of the appendages can be distinguished. (Fig. 58 after Sedgwick.) examples are found in North America. Peripatus is a South Amer- ican representative of the class.

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