Illustrated Study 



219 



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 verte- 

 brate 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 vertebras, or vertebrae 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 



FIG. 39a. MAN. shortest jaws? Why? What seems to be the 



typical number of ribs ? limbs ? digits ? • 

 Does flipper of a dolphin have same bones as arm of a man ? 

 How many thumbs has chimpanzee ? Which is more specialized, the foot of a 

 man or a chimpanzee? Is the foot of a man or a chimpanzee better suited for 

 supporting weight ? How does its construction fit it for this ? 



Which has a better hand, a man or a chimpanzee ? What is the difference in 

 their arms ? Does difference in structure correspond to difference in use ? 

 Which of the seven skeletons bears the most complex breastbone ? 

 Which skeleton bears no neck (or cervical) vertebrae ? Which bears only one ? 

 Are all the classes of vertebrates represented in this chart ? (p. 125.) 



