LIST OF ILLUSTRATIONS. 



Page 

 Jaws and Teeth of (A) Male. 



and (B) Female Skate .. 313 



Diagram of Arterial System of 



a Skate .. . . . . .. 316 



Diagram of the Venous System 



of a Skate 318 



, Male Urogenital Organs of a 



Skate 319 



The Ear (Membranous Laby- 

 rinth) of the Skate . . . . 323 

 Dorsal View of Cranium of a 



Skate . . . . . . . . 324 



, Lateral View of Skull of Skate 325 

 Dorsal View of Pectoral Girdle 



and Fin of the Skate . . 327 



Dorsal View of Pelvic Girdle 



and Fins of the Skate , . 328 



Lateral View of the Haddock 331 

 Dissection of Haddock from 



the Left Side . . . . . . 333 



Lateral View of Cod's Skull . . 335 

 The Right Pectoral Fin and 



Girdle of the Cod with both 



Pelvic Fins .. .. .. 336 



The Common Frog . . . . 338 



Diagram of Venous System of 



a Frog .. .. .. .. 341 



Ventral View of the Female 



Urogenital Organs of a Frog 343 

 Diagram of Arterial System of 



a Frog 344 



Diagram of the Truncus 



Arteriosus of a Frog's Heart 345 

 Dorsal View of Brain of Frog 346 

 Ventral View of Frog's Skull 348 

 Dorsal View of Frog's Skull , . 348 

 Dorsal View of Entire Frog's 



Skeleton. . . . . . . 349 



Pectoral Girdle of Rana . . 351 



Fore-limb of Rana .. .. 351 



Pelvic Girdle of Rana . . . . 352 



Hind-limb of Rana . . . . 352 



Three Stages in Development 



of Frog's Egg . . . . 354 



Sections of Frog Embryos . . 355 

 The Structuie of Frog's 



Embryo and Tadpole . . 356 



Young Tadpole dissected from 



the Ventral Side .. .. 357 

 The Life History of the Com- 

 mon Frog _ 358 



View of Respiratory Organs of 



the Pigeon . . . . . . 362 



Ventral View of the Venous 



System of the Pigeon _. . 365 



Ventral View of the Arterial 



System of the Pigeon . . 367 



Ventral View of Male Uro- 

 genital Organs of the Pigeon 368 

 A Cervical Vertebra of the 



Pigeon . . . . . . . . 369 



Lateral View of Cervical 



Vertebra of the Pigeon .. 370 

 A Rib of the Pigeon . . . . 370 



Fig. P; 



264. Ventral View of Sternum of 



the Pigeon . . . . . . ; 



265. The Pectoral Girdle of the 



Pigeon . . 



266. The Skeleton of a Bird's Wing 



267. Left Leg of the Pigeon 



268. Lateral View of Pelvis of the 



Pigeon . . 



269. Diagram of a Fowl's Egg at 



Laying . . 



270. Three Consecutive Stages of 



the Blastoderm of a Chick in 

 Early Stages of Incubation 



271. Section through a Chick's Egg 



at Various Stages 



272. View of the Area Pellucida of 



a Chick's Blastoderm of about 

 18 Hours 



273. View of Chick's Blastoderm 



about 24 Hours 



274. Cross-section through a Blasto- 



derm of about 24 Hours 



275. Transverse Section of an 



Embryo Chick of the Second 

 Day .. .. .. 



276. Diagram of Developing Chick 



277. Permanent Dentition of the 



Hare 



278. Female Urogenital Organs of 



the Rabbit 



279. Rabbit's Brain . . 



280. A Median Longitudinal Section 



through the Rabbit's Brain . . 



281. Lateral View of Skull of the 



Rabbit .. 



282. Posterior View of Atlas Ver- 



tebra of Rabbit 



283. Lateral View of Axis Vertebra 



of Rabbit 



284. Anterior View of a Cervical 



Vertebra of Rabbit . . 



285. Lateral View of Thoracic Ver- 



tebra of Rabbit 



286. Anterior View of a Lumbar 



Vertebra of Rabbit . . 



287. Lateral View of a Lumbar 



Vertebra of Rabbit 



288. Pectoral Girdle and Fore-limb 



of the Rabbit 



289. Dorsal View of Left Manus of 



Rabbit 



290. Bones of Pelvic Girdle and 



Hind -Limb of Rabbit 



291. Dorsal View of Left Pes of the 



Rabbit 



292. Four Stages in the Develop- 



ment of the Vertebrate Brain 



293. Diagram of the Vertebrate 



Brain 



294. Diagrammatic Median Section 



through a Vertebrate Brain 



295. Three Stages in the Develop- 



ment of the Vertebrate Eye 



296. Diagram of the Vertebrate Eye 



372 

 373 

 374 



374 



375 



376 

 377 



378 

 378 

 379 



384 



3S9 

 391 



392 



394 



395 



395 



395 



396 



396 



396 



397 



398 



399 



400 



406 



407 



407 



