. Beginners' Zoology . h its attempts to right itself. Arethe motions suited to accomplish the object ? Does thetortoise succeed ? What are the prevailing colours of turtles? How doestheir coloration correspond to their surroundings? What parts of the tortoise extend at times beyond theshell ? Are any of these parts visible when the s/iell isclosed? What movements of the shell take place as it isclosed ? Is the carapace rigid throughout ? Is the plastron ? 142 BEGINNERS ZOOLOGY The Skeleton (Fig. 267). — The carapace is covered with---thin epidermal plates which belong to the skin. The bonynat
. Beginners' Zoology . h its attempts to right itself. Arethe motions suited to accomplish the object ? Does thetortoise succeed ? What are the prevailing colours of turtles? How doestheir coloration correspond to their surroundings? What parts of the tortoise extend at times beyond theshell ? Are any of these parts visible when the s/iell isclosed? What movements of the shell take place as it isclosed ? Is the carapace rigid throughout ? Is the plastron ? 142 BEGINNERS ZOOLOGY The Skeleton (Fig. 267). — The carapace is covered with---thin epidermal plates which belong to the skin. The bonynature of the carapace isseen when the plates areremoved, or if its innersurface is viewed (). It is seen to con-sist largely of wide ribs(how many ?) much flat-tened and grown togetherat their edges. The ribsare seen to be rigidly at-tached to the rear projections ofthe vertebrae are flattenedinto a series of bony plateswhich take the place ofthe sharp ridge foundalong the backs of most vertebrates. Fig. 267.— Skeleton of EuropeanTortoise. C, rib plates; /7/, marginal plates; 5, plastron;H, humerus bone; R, radius; U, ulna;Fe, femur.
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