INTRODUCTION. Pp. 1-16.
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, p. 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. DICYEMIDÆ AND ORTHONECTIDÆ. 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.
CHAPTER IX. MOLLUSCA.
Formation of the layers and larval characters, pp. 225-273. Gasteropoda and Pteropoda, pp. 225-242. Cephalopoda, pp. 242-254. Polyplacophora, pp. 254-257. Scaphopoda, pp. 257, 258. Lamellibranchiata, pp. 258-269. General review of Molluscan Larvæ, pp. 270-273. Development of organs, pp. 273-288.
CHAPTER X. POLYZOA.
Entoprocta, pp. 292-297. Ectoprocta, pp. 297-305. Summary and general considerations, pp. 305-308.
CHAPTER XI. BRACHIOPODA.
Development of the layers, pp. 311-313. The history of the larva, pp. 313-317. Development of organs, p. 317. General observations on the affinities of the Brachiopoda, pp. 317, 318.