Chapter VIII. Aves. Pp. [145]-201.
Segmentation and formation of the layers, pp. [145]-166. General history of of the germinal layers, pp. [166]-169. General development of the embryo, pp. [169]-180. Fœtal membranes, pp. [185]-199. Amnion, pp. [185]-191. Allantois, pp. [191]-193. Yolk-sack, pp. [193]-199.
Chapter IX. Reptilia. Pp. [202]-213.
Lacertilia, pp. [202]-209. Segmentation and formation of the layers, pp. [202]-207. General development of the embryo, p. [208]. Embryonic membranes and yolk-sack, pp. [208]-210. Ophidia, p. [210]. Chelonia, pp. [210]-212.
Chapter X. Mammalia. Pp. [214]-274.
Segmentation and formation of the layers, pp. [214]-227. General growth of the embryo, pp. [227]-232. Embryonic membranes and yolk-sack, pp. [232]-239. Comparative history of the Mammalian fœtal membranes, pp. [239]-257. Comparative histology of the placenta, pp. [257]-259. Evolution of the placenta, pp. [259]-261. Development of the Guinea-pig, pp. [262]-265. The human embryo, pp. [265]-270.
Chapter XI. Comparison of the formation of the Germinal Layers and of the early stages in the development of Vertebrates. Pp. [275]-310.
Formation of the gastrula, pp. [275]-292. The formation of the mesoblast and of the notochord, pp. [292]-300. The epiblast, pp. [300]-304. Formation of the central nervous system, pp. [301]-304. Formation of the organs of special sense, p. [304]. Summary of organs derived from the three germinal layers, pp. [304]-306. Growth in length of the Vertebrate embryo, pp. [306]-309. The evolution of the allantois and amnion, pp. [309], [310].
Chapter XII. Observations on the ancestral form of the Chordata. Pp. [311]-330.
General considerations, pp. [311]-316. The medullary canal, pp. [316], [317]. The origin and nature of the mouth, pp. [317]-321. The cranial flexure, pp. [321], 322. The postanal gut and neurenteric canal, pp. [322]-325. The body-cavity and mesoblastic somites, p. [325]. The notochord, pp. [325], [326]. Gill clefts, pp. [326], [327]. Phylogeny of the Chordata, pp. [327]-329.