. Beginners' Zoology . Fig. 267.— Skeleton of EuropeanTortoise. C, rib plates; /7/, marginal plates; 5, plastron;H, humerus bone; R, radius; U, ulna;Fe, Fig. 268. —Three-cham-bered Heart of a Rep-tile (tortoise). a, veins; b,f, right and left auri-cles; i^, ventricle; </, arteries tolungs; f, veins from lungs; i,n,two branches of aorta. Compare with Fig. 269 and coloured Show that the shellof a turtle is not homologous withthe shells of molluscs. Does theturtle have shoulder blades andcollar bones} Hip Thighbones .•* Shin bone (fibia) and splintbone (fibula)} (Fig. 26
. Beginners' Zoology . Fig. 267.— Skeleton of EuropeanTortoise. C, rib plates; /7/, marginal plates; 5, plastron;H, humerus bone; R, radius; U, ulna;Fe, Fig. 268. —Three-cham-bered Heart of a Rep-tile (tortoise). a, veins; b,f, right and left auri-cles; i^, ventricle; </, arteries tolungs; f, veins from lungs; i,n,two branches of aorta. Compare with Fig. 269 and coloured Show that the shellof a turtle is not homologous withthe shells of molluscs. Does theturtle have shoulder blades andcollar bones} Hip Thighbones .•* Shin bone (fibia) and splintbone (fibula)} (Fig. 267.) Do the plates formed by the ribsextend to the edge of the cara-pace . See Fig. 26]. About howmany bony plates form the cara-pace . The plastron t Do thehorny plates outside correspondto the bony plates of the shell} REPTILIA 143
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