CONTENTS. XXV 



Paragraph Page 



307. Sensory organs 397 



308. Alimentary canal 398 



309 — 311. Kespiratory antechamber (Branchial cavity) .... 399 



312. Enteron 403 



313. Vascular system 404 



314. Generative organs .......... 406 



Ninth Section. Vertebrata. 



315. General review of the group ........ 408 



Bibliography ........... 412 



316. Form of the body 413 



317. 318. Appendages 414 



319. 320. Integument 417 



321—323. Epidermal structures 419 



324—326. Dermal skeleton 422 



327. Internal skeleton 426 



328—334. Vertebral column 428 



335—337. Ribs 438 



338. Sternum 442 



339. 340. Cephalic skeleton 444 



341—352. Skull 447 



353—356. Branchial skeleton 468 



357. Skeleton of the appendages ....... 472 



358 — 360. Anterior appendages 474 



Shoulder-girdle ......... 474 



361 — 365. Anterior extremity ......... 477 



366. Posterior appendages ........ 484 



Pelvic-girdle .......... 484 



367 — 369. Posterior extremity 487 



370. Muscular system 491 



371. Dermal muscles 492 



372—377. Musculature of the skeleton 493 



378. Electric organs 499 



379. Nervous system .......... 501 



380. 381. A. Central organs of the nervous system 503 



a) Brain 503 



382. 383. b) Spinal chord 511 



384. c) Investments of the central nervous system . . . 512 



385. B. Peripheral nervous system ....... 513 



386. a) Spinal nerves ......... 514 



387—392. b) Cerebral nerves 515 



393. c) Visceral nerves 522 



894. 395. Sensory organs 523 



396. Olfactory organs .......... 525 



397—399. • Visual organs 527 



400 — 403. Auditory organs 533 



404. Alimentary canal .......... 539 



405. Respiratory antechamber (Cephalic enteron) .... 540' 

 406—409. Branchiffl 541 



A ** 



