Embryonic vesicle of a rabbit Fig. 119. Section of the gastrula of four vertebrates Figs 120. Embryonic shield of a rabbit Figs. 121–123. Dorsal shield and embryonic shield of a rabbit. Fig. 124. Cœlomula of the amphioxus Fig. 125. Chordula of a frog Fig. 126. Section of frog-embryo Figs. 127–128. Dorsal shield of a chick Fig. 129. Section of hind end of a chick Fig. 130. Germinal area of the rabbit Fig. 131. Embryo of the opossum Fig. 132. Embryonic shield of the rabbit Fig. 133. Human embryo at the sandal-stage Fig. 134. Embryonic shield of rabbit Fig. 135. Embryonic shield of opossum Fig. 136. Embryonic disk of a chick Fig. 137. Embryonic disk of a higher vertebrate Figs. 138–142. Sections of maturing mammal embryo Figs. 143–146. Sections of embryonic chicks Fig. 147. Section of embryonic chick Fig. 148. Section of fore-half of chick-embryo Figs. 149–150. Sections of human embryos Fig. 151. Section of a shark-embryo Fig. 152. Section of a duck-embryo Figs. 153–155. Sole-shaped embryonic disk of chick Figs. 156–157. Embryo of the amphioxus Figs. 158–160. Embryo of the amphioxus Figs. 161–162. Sections of shark-embryos Fig. 163. Section of a Triton-embryo Figs. 164–166. Vertebræ Fig. 167. Head of a shark-embryo Figs. 168–169. Head of a chick-embryo Fig. 170. Head of a dog-embryo Fig. 171. Human embryo of the fourth week Fig. 172. Section of shoulder of chick-embryo Fig. 173. Section of pelvic region of chick-embryo Fig. 174. Development of the lizard’s legs Fig. 175. Human-embryo five weeks old Figs. 176–178. Embryos of the bat Fig. 179. Human embryos Fig. 180. Human embryo of the fourth week Fig. 181. Human embryo of the fifth week Fig. 182. Section of tail of human embryo Figs. 183–184. Human embryo dissected Fig. 185. Miss Julia Pastrana Figs. 186–190. Human embryos Fig. 191. Human embryos of sixteen to eighteen ays Figs. 192–193. Human embryo of fourth week Fig. 194. Human embryo with its membranes Fig. 195. Diagram of the embryonic organs Fig. 196. Section of the pregnant womb Fig. 197. Embryo of siamang-gibbon Fig. 198. Section of pregnant womb Figs. 199–200. Human fœtus–placenta Fig. 201. Vitelline vessels in germinative area Fig. 202. Boat-shaped embryo of the dog Fig. 203. Lar or white-handed gibbon Fig. 204. Young orang Fig. 205. Wild orang Fig. 206. Bald-headed chimpanzee Fig. 207. Female chimpanzee Fig. 208. Female gorilla Fig. 209. Male giant-gorilla Fig. 210. The lancelet Fig. 211. Section of the head of the lancelet Fig. 212. Section of an amphioxus-larva Fig. 213. Diagram of preceding Fig. 214. Section of a young amphioxus Fig. 215. Diagram of a young amphioxus Fig. 216. Transverse section of lancelet Fig. 217. Section through the middle of the lancelet Fig. 218. Section of a primitive-fish embryo Fig. 219. Section of the head of the lancelet Figs. 220. Organisation of an ascidia Figs. 221. Organisation of an ascidia Figs. 222–224. Sections of young amphioxus-larvæ Fig. 225. An appendicaria Fig. 226. Chroococcus minor Fig. 227.