Beginners' zoology . Fig. 268. —Three-cham-bered Heart of a Rep-tile (tortoise). «, veins; b,f, right and left auri-cles ; eg, ventricle; d, arteries tolungs; , veins from lungs; i,n,two branches of aorta. Compare with Fig. 2t59 and coloured Show that the shellof a turtle is not homologous withthe shells of mollusks. Does theturtle have shoulder blades andcollarbones. Hipbones? 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. 26j. About howmany bony plates form the cara-pace ? The plastron ?
Beginners' zoology . Fig. 268. —Three-cham-bered Heart of a Rep-tile (tortoise). «, veins; b,f, right and left auri-cles ; eg, ventricle; d, arteries tolungs; , veins from lungs; i,n,two branches of aorta. Compare with Fig. 2t59 and coloured Show that the shellof a turtle is not homologous withthe shells of mollusks. Does theturtle have shoulder blades andcollarbones. Hipbones? 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. 26j. About howmany bony plates form the cara-pace ? The plastron ? Do thehorny plates outside correspondto the bony plates of the shell ? REPTILIA 143. Fig. 269.—Plan of Rep-tilian arrows. How many axial plates} How many costal (rib) plates .? How many border Which plates are largest .< Smallest} Do the horny plates overlap like shingles, or meet edge to edge ? Is there any mark where they meet on the bony shell. Basing it upon foregoing facts, give a connected and complete de-scription of the structure of the carapace. Compare the skeleton of the turtle with that of the snake, and correlate the differences in structure with differences in the tortoise seen from the side or above, with its shell closed, showing the arrange-ment of the plates. Place soft or tender vegetablefood, lettuce, mushroom, roots, ber-ries, and water, also meat, in reachof the turtle. What does it pre-fer } How does it eat} It has nolips; how does it drink } Study the movements of its eye-balls and eyelids, and the respira-tory and other movements alreadymentioned. State a reason forthinking that no species of landani
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
