Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 ENDO—SKELETON. usually products of the external skin (chitin), or they ruay be internal (cartilage, bone) and give rise to vertebrae (fig. 74 a, b). In either case the body becomes divided at right angles to its long axis into a series of segments, which, in the simpler cases of locomotion, are honionomous (Annelids, Myriapods, Snakes). As development progresses some of the muscles required for locomotion gradually los
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 ENDO—SKELETON. usually products of the external skin (chitin), or they ruay be internal (cartilage, bone) and give rise to vertebrae (fig. 74 a, b). In either case the body becomes divided at right angles to its long axis into a series of segments, which, in the simpler cases of locomotion, are honionomous (Annelids, Myriapods, Snakes). As development progresses some of the muscles required for locomotion gradually lose their relation to the axis of the body, and acquire a relation to secondary axes; and in this way conditions are acquired for the accomplishment of more difficult and complete forms of locomotion. The hard parts in the long axis of the body then looe their primitive
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