CHAPTER I. CEPHALOCHORDA. Pp. 1-8.✦

Segmentation and formation of the layers, pp. 1-3. Central nervous system, pp. 3, 4. Mesoblast, p. 5. General history of larva, pp. 6-8.

CHAPTER II. UROCHORDA. Pp. 9-39.✦

Solitaria, pp. 9-23. Development of embryo, pp. 9-15. Growth and structure of free larva, pp. 15-19. Retrogressive metamorphosis, pp. 19-23. Sedentaria, p. 23. Natantia, pp. 23-28. Doliolidæ, pp. 28, 29. Salpidæ, pp. 29-34. Appendicularia, p. 34. Metagenesis, pp. 34-38.

CHAPTER III. ELASMOBRANCHII. Pp. 40-67.✦

Segmentation and formation of the layers, pp. 40-47. Epiblast, p. 47. Mesoblast, pp. 47-51. Hypoblast and notochord, pp. 51-54. General features of the embryo at successive stages, pp. 55-62. The yolk-sack, pp. 62-66.

CHAPTER IV. TELEOSTEI. Pp. 68-82.✦

Segmentation and formation of the layers, pp. 68-73. General history of the layers, pp. 73-75. General development of the embryo, pp. 76-81.

CHAPTER V. CYCLOSTOMATA. Pp. 83-101.✦

Segmentation and formation of the layers, pp. 83-86. Mesoblast and notochord, pp. 86, 87. General history of the development, pp. 87-97. Metamorphosis, pp. 97-100. Myxine, p. 100.

CHAPTER VI. GANOIDEI. Pp. 102-119.✦

Acipenser, pp. 102-110. Segmentation and formation of the layers, pp. 102-104. General development of the embryo and larva, pp. 104-110. Lepidosteus, pp. 111-119. Segmentation, pp. 111, 112. General development of embryo and larva, pp. 112-119. General observations on the embryology of Ganoids, p. 119.

CHAPTER VII. AMPHIBIA. Pp. 120-144.✦

Oviposition and impregnation, pp. 120, 121. Formation of the layers, pp. 121-124. Epiblast, pp. 125-127. Mesoblast and notochord, pp. 128, 129. Hypoblast, pp. 129-131. General growth of the embryo, pp. 131-143. Anura, pp. 131-141. Urodela, pp. 141-143. Gymnophiona, p. 143.