402 AN INTRODUCTION TO THE STUDY OF FOSSILS 



34. Name the three classes of whale with an example of each. 

 From what forms may they possibly be descended ? 



35. Define the order Primates. Give the sub-orders into 

 which they are divided with an example and geologic range of 

 each. 



36. Name some of the primitive characters of the genus Homo. 



37. Name three generalized types and the lines of descent 

 which diverged from them. 



1. Distinguish the Chordata from Invertebrata. 



2. Why is the name Chordata used for this phylum ? 



3. Which alone of the three sub-phyla has known fossil 

 representatives ? 



4. What is the significance of the term Vertebrata for the 

 members of this sub-phylum ? 



5. Name the phyla into which animals are divided, giving 

 the bases of this classification. How does this increase in 

 complexity of organization correspond to the order of their 

 appearance in geologic time ? 



