List of Illustrations. 



PlO. PAOB 



272. Diagrammatic vertical longitudinal section through the brain of » 



Vertebrate 330 



331 

 332 

 334 

 335 

 337 



273. Horizontal longitudinal section through the brain of a Vertebrate 



274. Central nervous system of a Tortoise 



275. Diagrammatic representation of the development of the vertebrate eye 



276. Diagrammatic section through the orbit, A oi a, Fish, B of a Mammal 



277. Pineal eye of a Lizard .... 



278. Diagram of the auditory organ of a Vertebrate 



279. Diagram of various developing teeth . . 339 



280. Section through a tooth to show the structure of the dentine . . . 340 



281. Portion of the upper jaw of a Lizard . 340 



282. Diagram to explain the structure of the mesentery 342 



283. Anterior portion of Chick embryo .... . . 343 



284. Heart of an Amphibian. .... 344 



285. Diagrammatic longitudinal section through the head and front end of the 



body to show the position of the heart and pericardium . . 345 



286. Diagrams of -the arterial arches of various Vertebrata . . 347 



287. Diagram of the end of a urinary tubule of a Vertebrate .... 348 



288. Testis, kidney, etc., of an Amphibian 349 



289. Testis, embryonic Mdney, etc., of the embryo of a higher Vertebrate . 349 



290. Diagram of a pronephros .... .... 350 



291. Section through the ovary of a Mammal . . . . . 351 



292. Illustrating the development of the embryonic membranes in a Bird 



embryo 353 



293. Diagrammatic longitudinal section of Amphioxus ..... 355 



294. Transverse section through the anterior region of the body of Amphioxus 355 



295. Diagrammatic section of the skin of a Teleostean ..... 356 



296. Portion of a fin with spiny rays and soft rays 358 



297. Skeleton of a Trout 359 



298. Longitudinal sections through the vertebral column of various Fish . . 360 



299. End of the tail of various Fish 361 



300. SkuUofaPeroh 363 



301. Skull and visceral arches of 4 a Shark, B a Pike . .... 364 



302. Skull of a Cod 365 



303. Shoulder-girdle and fore-limb of a Perch . .... 366 



304. Skeleton of fore-limb of A Shark, B Polypterus, C Amia, D Cod. . . 367 



305. Sensory papilla of a young Teleostean 369 



306. Sternarchus curvirostris ..... 371 



307. Horizontal section through the head of AcantMas 372 



308. Horizontal section through the head of a Cod 372 



309. Transverse section of a gill arch in various Fish 373 



310. Longitudinal section of the heart of different Fish 376 



311. Toung Pike at different stages 380 



312. Larva of Trachypterus " 380 



313. A Bay embryo, B Shark embryo 381 



314. Chimsera monstrosa . " . ... 384 



315. Lepidosteus 385 



316. Ceratodus .... 386 



317. Protopterus annectens . . .... 386 



