Aphanocapsa primordialis Fig. 228. Protamœba Fig. 229. Original ovum-cleavage Fig. 230. Morula Figs. 231–232. Magosphæra planula Fig. 233. Modern gastræads Figs. 234–235. Prophysema primordiale Figs. 236–237. Ascula of gastrophysema Fig. 238. Olynthus Fig. 239. Aphanostomum langii Figs. 240–241. A turbellarian Figs. 242–243. Chætonotus Fig. 244. A nemertine worm Fig. 245. An enteropneust Fig. 246. Section of the branchial gut Fig. 247. The marine lamprey Fig. 248. Fossil primitive fish Fig. 249. Embryo of a shark Fig. 250. Man-eating shark Fig. 251. Fossil angel-shark Fig. 252. Tooth of a gigantic shark Figs. 253–255. Crossopterygii Fig. 256. Fossil dipneust Fig. 257. The Australian dipneust Figs. 258–259. Young ceratodus Fig. 260. Fossil amphibian Fig. 261. Larva of the spotted salamander Fig. 262. Larva of common frog Fig. 263. Fossil mailed amphibian Fig. 264. The new zealand lizard Fig. 265. Homœosaurus pulchellus Fig. 266. Skull of a permian lizard Fig. 267. Skull of a theromorphum Fig. 268. Lower jaw of a primitive mammal Figs. 269–270. The ornithorhyncus Fig. 271. Lower jaw of a promammal Fig. 272. The crab-eating opossum Fig. 273. Fœtal membranes of the human embryo Fig. 274. Skull of a fossil lemur Fig. 275. The slender lori Fig. 276. The white-nosed ape Fig. 277. The drill-baboon Figs. 278–282. Skeletons of man and the anthropoid apes Fig. 283. Skull of the java ape-man Fig. 284. Section of the human skin Fig. 285. Epidermic cells Fig. 286. Rudimentary lachrymal glands Fig. 287. The female breast Fig. 288. Mammary gland of a new-born infant Fig. 289. Embryo of a bear Fig. 290. Human embryo Fig. 291. Central marrow of a human embryo Figs. 292–293. The human brain Figs. 294–296. Central marrow of human embryo Fig. 297. Head of a chick embryo Fig. 298. Brain of three craniote embryos Fig. 299. Brain of a shark Fig. 300. Brain and spinal cord of a frog Fig. 301. Brain of an ox-embryo Fig. 302. Brain of a human embryo Fig. 303. Brain of a human embryo Fig. 304. Brain of the rabbit Fig. 305. Bead of a shark Figs. 306–310. Heads of chick-embryos Fig. 311. Section of mouth of human embryo Fig. 312. Diagram of mouth-nose cavity Figs. 313–314. Heads of human embryo Figs. 315–316. Face of human embryo Fig. 317. The human eye Fig. 318. Eye of the chick embryo Fig. 319. Section of eye of a human embryo Fig. 320. The human ear Fig. 321. The bony labyrinth Fig. 322. Development of the labyrinth Fig. 323. Primitive skull of human embryo Fig. 324. Rudimentary muscles of the ear Figs. 325–326. The human skeleton Fig. 327. The human vertebral column Fig. 328. Piece of the dorsal cord Figs. 329–330. Dorsal vertebræ Fig. 331. Intervertebral disk Fig. 332. Human skull Fig. 333. Skull of new-born child Fig. 334. Head-skeleton of a primitive fish Fig. 335. Skulls of nine primates Figs. 336–338. Evolution of the fin Fig. 339. Skeleton of the fore-leg of an amphibian Fig. 340. Skeleton of gorilla’s hand Fig. 341. Skeleton of human hand Fig. 342.