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 vertebrae, or vertebras beyond 

 hhe 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? 



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



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

 man or that of a chimpanzee? Is the foot of a man or that of 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) vertebras ? Which bears only one 1 



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



Fig. 399. — Man. 



