PROMORPHOLOGY. pi 



6. Why are vehicles (made by man) bilaterally symmetrical? 



7. Express in tabular form the differences between the poles of the 

 three axes of bilateral animals, and what you can gather as to the causes 

 of the differences. 



8. For what kind of life does bilateral symmetry fit the animal? 



9. For what kind of life does radial symmetry seem suited? Verify 

 by illustrations. 



10. To what extent do animals seem able to regenerate lost parts? 

 Trace out the conditions in various groups, as far as your reference library 

 will allow. 



11. Is there any apparent limit to the numbers of metameres which 

 animals may possess? What degree of constancy or variability in this 

 particular can you discover in various individuals of the same species? 



