Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 SHELL OF CALCIUM CARBONATE LINE OF MANTLE ATTACHMENT PLATE OF CHITIN FIG. 69 SHELL OF A CLAM {MOLLUSC) FIG. 90. SECTION OF ABDOMINAL SEGMENT OF LOBSTER (ARTHROPOD) Figs. 87, 88, 89, and 90.—Some types of invertebrate exoskeletal and supporting structures. (Fig. 87 partly after Kiihn: Grundriss der allgemeinen Zoologie. Georg Theime, Leipzig.)

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