CONTENTS OF VOLUME I. 



INTRODUCTION. Pp. 1 13. 



CHAPTER I. THE OVUM AND SPERMATOZOON. 



General history of the Ovum, pp. 14 20. Special history of the Ovum in 

 different types, pp. 21 52. The Spermatozoon, pp. 52 54. 



CHAPTER II. THE MATURATION AND IMPREGNATION OF THE OVUM. 



Maturation of the Ovum, and formation of the polar bodies, pp. 55 64. 

 Impregnation of the Ovum, pp. 64 70. Summary, pp. 70. 



CHAPTER III. SEGMENTATION OF THE OVUM. 



Internal phenomena of Segmentation, pp. 72 75. External features of 

 Segmentation, pp. 75- 100. 



INTRODUCTION TO SYSTEMATIC EMBRYOLOGY. Pp. 103 107. 

 CHAPTER IV. DICYEMID.E AND ORTHONECTID.E. Pp. 108 112. 

 CHAPTER V. PORIFERA. Pp. 113124. 



CHAPTER VI. COZLENTERATA. 



Hydrozoa, pp. 125 138. Actinozoa, pp. 138 143. Ctenophora, pp. 143 

 147. Summary, etc., pp. 147 150. Alternations of generations, pp. 151 154. 



CHAPTER VII. PLATYELMINTHES. 



Turbellaria, pp. 156162. Neruertea, pp. 162169. Trematoda, pp. 169 

 174. Cestoda, pp. 174180. 



CHAPTER VIII. KOTIFERA. Pp. 183185. 



