CONTENTS OF VOLUME I. 



INTRODUCTION. Pp. i 16. 



CHAPTER I. THE OVUM AND SPERMATOZOON. 



General history of the Ovum, pp. 17 25. Special history of the Ovum in 

 different types, pp. 26 65. The Spermatozoon, pp. 65 67. 



CHAPTER II. THE MATURATION AND IMPREGNATION OF THE OVUM. 



Maturation of the Ovum, and formation of the polar bodies, pp. 68 79, 

 Impregnation of the Ovum, pp. 79 86. Summary, pp. 86. 



CHAPTER III. THE SEGMENTATION OF THE OVUM. 



Internal phenomena of Segmentation, pp. 88 92. External features of 

 Segmentation, pp. 92 122. 



INTRODUCTION TO SYSTEMATIC EMBRYOLOGY. Pp. 125 130. 

 CHAPTER IV. DICYEMID^E AND ORTHONECTID/E. Pp. 131 137. 

 CHAPTER V. PORIFERA. Pp. 138 151. 



CHAPTER VI. COELENTERATA. 



Hydrozoa, pp. 152 167. Actinozoa, pp. 167 173. Ctenophora, pp. 173 

 178. Summary, etc., pp. 178 182. Alternations of generations, pp. 182 



187. 



CHAPTER VII. PLATYELMINTHES. 



Turbellaria, pp. 189 196. Nemertea, pp. 196 204. Trematoda, pp. 205 

 210. Cestoda, pp. 210 218. 



CHAPTER VIII. ROTIFERA. Pp. 221 224. 



