XXVI 



CONTENTS. 



Paragraph Page 



410. Branchial clefts and palate of the Amniota .... 545 



411. 412. Nasal cavity 547 



413. Buccal cavity 548 



414 — 416. Organs of the buccal cavity 549 



417. Alimentary canal proper (Enteron of the trunk) . . . .555 



418. Fore-gut 556 



419. Mid-gut 559 



420. Hind-gut 561 



421. Organs appended to the mid-gut ....... 563 



422. Mesentery 565 



423. Pneumatic organs of the enteric tube ...... 566 



424. a) Air-bladder 567 



425—427. b) Lungs 569 



428. Coelom 574 



429. 430. Vascular system 575 



431 — 436. Heart and arterial system 577 



437—442. Venous system 589 



443 — 446. Lymphatic system 597 



447 — 449. Excretory organs 601 



450 — 458. Generative organs 608 



