2. Primary and Secondary Sexual Characters. The ovaries and 

 testes are primary sexual characters ; all other sexual characters^ 

 which are dependent for their development upon the primary ones, 

 are secondary sexual characters. Draw and compare the secondary 

 characters which distinguish male and female, and, it possible, 

 determine the significance of each. 



3. Semination. Is semination internal or external? Draw the 

 structures of the male and female which serve to bring the sperma- 

 tozoa to the ova. 



4. Types of Development. Where does the development of the 

 embryo occur ? Is the animal oviparous or viviparous ? Do the 

 embryos obtain their food by their own activities (larval develop- 

 ments), or from the mother (foetal development) ? 



5. Care of Eggs and Young. In the species you are studying 

 are the eggs and young cared for? If so, how? 



