LIST OF ILLUSTRATIONS. 



297. 



29Q- 

 300. 



301. 

 302. 



304- 

 305- 

 306. 



309- 

 310. 



3"- 

 312. 



313- 



314. 

 315- 



316. 



317- 

 318. 



319- 

 320. 



322. 

 323- 



324- 



325. 



326. 

 327- 

 328. 

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 330- 



Page 

 Development of the Vertebrate 



Ear 4" 



A Diagram of the Vertebrate 



Ear 412 



Development of Vertebrate 



Cranium .. .. •• 415 



Development of Vertebrate 



Cranium . . . . _ •• 415 



Diagram of Pentadactyle Limb 420 

 Development of the Vertebrate 



Heart 421 



Lateral Views of Anterior 

 Arterial System of Verte- 

 brates . . . . . . . . 422 



The Arterial Arches of Verte- 

 brates . . . . . . . . 423 



Diagrammatic Transverse Sec- 

 tion of a Vertebrate Embryo 423 

 Diagrammatic Transverse Sec- 

 tion through a later Vertebrate 

 Embryo « . . . , . . 424 



The Parts of the Coelom in the 



Thoracic Cavity of a Mammal 424 

 The Evolution of the Foetal 



Membranes of Vertebrata . . 428 

 The River- Lamprey . . . . 434 



Tails of Fishes . . . . . . 435 



Fins of Fishes . . . . . . 436 



Lateral View of Skull of 

 Rattlesnake . . . . . . 442 



Right Shoulder Girdle of a 

 Tortoise . . . . . . 443 



Skeleton of a Tortoise . , . . 444 



Dorsal View of a Crocodile's 



Skull ..445 



Ventral View of Crocodile's 

 Skull . . . . . . . . 446 



Archaeopteryx . . . . . . 450 



Ventral Surface of the Skull of 

 an Ostrich .. . . . . 451 



The Kiwi . . . . . . . . 452 



Section through the Skin of a 

 Mammal . . . . . . 454 



Diagrammatic Sections illus- 

 trating the Development of a 

 Hair .. .. .. .. 456 



A Rete Mirabile . . . . 464 



Diagram of Mammalian 



Female Urogenital Organs . 467 

 Three Types of Mammalian 

 Scapula . . . . . . . . 470 



Lateral Views of Crocodile's 

 Pelvis, Pelvis of Prototheria, 

 and Pelvis of Eutheria . . 471 



Diagram of the Typical Mam- 

 malian Fore- and Hind-Limb 473 

 The Mammalian Graafian 



Follicle in the Ovary . . 476 



Three Early Stages in Develop- 

 ment of Rabbit . . . . 477 



Diagrams of the Foetal Mem- 

 branes of a Manmial . . . . 478 



An P^mbryo Horse of Six 

 Weeks in its Membranes . . 483 



335- 

 336. 

 337- 



338. 



339- 

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342. 



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344. 



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 360. 



36T. 



362. 

 363- 



364- 

 365- 



366. 

 367- 



Page 

 Six Different Types of Placenta 483 

 Diagram of the Foetal Mem- 

 branes of Echidna, as seen in 

 Cross-section . . . , . . 488 



Ventral View of Male Uro- 

 genital Organs of Ornithor- 

 hynchus . . . . . . 489 



Ventral View of Pectoral 

 Girdle and Fore-Limb of 

 Ornithorhynchus . . . . 490 



Pelvis of Ornithorhynchus . . 490 

 Duckmole . . . . . . 491 



Fore (A) and Hind (B) Foot of 

 the Duckmole . , . . . . 492 



Bones of Limbs of Ornithor- 

 hynchus . . . . . . 493 



Skull of Ornithorhynchus . . 494 

 Diagram of Phascolarctos 

 {Koala) Embryo and its 

 Foetal Membranes .. .. 496 



Diagram of Hypsiprymnus (A 

 Kangaroo) Embryo in its 

 Foetal Membranes . . . . 496 



Diagram of Embryo of Pera- 



meles with Foetal Membranes 497 

 Lateral View of Skull of a 

 Young Kangaroo . . . . 499 



Ventral View of Skull of 

 Kangaroo . . . . . . 499 



Pelvic Girdle of the Kangaroo 501 

 Hind-foot of Kangaroo . . 501 



Jaws and Teeth of the Opossum 502 

 Inner View of Left Ramus of 

 Lower Jaw of Amphilestes 

 Broderipi . . . . . 503 



Posterior View of Lower Jaw 



of Wombat 504 



Lateral View of Horse's Skull 510 

 Ventral View of Skull of Horse 511 

 Upper Jaw (left-halO of Young 



(A) and Old Horse (B) . . 513 



Stomach of a Ruminant .. 514 



The Right Manus of a Horse 516 



516 

 517 

 517 

 518 

 518 



The Right Manus of an Ox 

 Tibiofibula of a Horse . . 

 Right Femur of a Horse 

 The Left Pes of an Ox . . 

 Right Pes of Horse 

 The Manus of (A) the Tapir, 



(B) the Rhinoceros ' and (C) 



the Horse 

 The Foot Skeleton of the 



Horse and Four of it 



Ancestors 

 Lateral View of Lion's Skull . 

 The Skull of the Dog from the 



Right Side 

 Ventral View of Lion's Skull 

 The Permanent Teeth of the 



Wolf ._ 528 



A Side View of a Cat's Toe 



with Retractile Claw . . 530 



Entire Skeleton of the Ai or 



Three-toed Sloth . . . . 532 



521 



522 

 525 



526 



527 



