Fig. 399.—Man.
Fig. 400.—Chimpanzee. (See Fig. [406].)
Illustrated Study of Vertebrate Skeletons: Taking man’s skeleton as complete, which of these seven skeletons is most incomplete?
Regarding the fish skeleton as the original vertebrate skeleton, how has it been modified for (1) walking, (2) walking on two legs, (3) flying?
Which skeleton is probably a degenerate reversion to original type? (p. [209].)
How is the horse specialized for speed?
Do all have tail vertebræ, or vertebræ beyond the hip bones? Does each have shoulder blades?
Compare (1) fore limbs, (2) hind limbs, (3) jaws of the seven skeletons. Which has relatively the shortest jaws? Why? What seems to be the typical number of ribs? limbs? digits?