xii CONTENTS 



CHAPTER Vlir 



PAGE 



CHARACTERS OF THE PHYLUM VERTEBRATA — AMPHIOXUS 403 



PRACTICAL DIRECTIONS . 4^0 



CHAPTER IX 



CHARACTERS OF THE CLASS PISCES — THE DOGFISH . . 4I4 



PRACTICAL DIRECTIONS . . 456 



CHAPTER X 



CHARACTERS OF THE CLASS MAMMALIA — THE RABBIT .... 466 

 PRACTICAL DIRECTIONS . . . .... 525 



CHAPTER XI 



the minute structure of cells — cell division — oogene- 

 sis and spermatogenesis — maturation and fertili- 

 zation of the ovum — effect of food-yolk on de- 

 velopment — formation of the chief organs of the 

 adult in vertebrates, and of the amnion, allantois 



and placenta 54i 



practical directions . . . 5s5 



Index . . .... 589 



