XXll LIST OF ILLUSTRATIONS 



FIG . PAGE 



296. Transverse section through pharyngeal region of Amphioxus 



— after Ray Lankester . . . . .518 



297. Development of atrial chamber in Amphioxus — after 



Lankester and Willey . . . . .519 



298. Sections through embryos of Amphioxus, to illustrate de- 



velopment of body cavity — after Hatschek . . 522 



299. The nephvidia. of Amphioxus — after Boveri . . . 524 



300. Small portions of excretory organs of Amphioxus (A) and the 



Polychaete Phyllodoce (B) — after Goodrich . '525 



301. Early stages in the development of Amphioxus — after 



Hatschek . . . . . . .526 



302. Larval Amphioxus, from the right side — after Willey . 527 



303. Diagrammatic section through a Vertebrate animal . -536 



304. Ideal fore- and hind-limb — after Gegenbaur . . . 538 



305. Partial section of a Vertebrate brain (diagrammatic) . . 540 



306. Vertical section of the pineal eye in an embryo of Spheno- 



don — after Dendy . . . . . -541 



307. Diagram illustrating the development of the nervous system 



in an Elasmobranch fish ..... 544 



308. Diagrammatic section of spinal cord .... 546 



309. Diagram of spinal cord of man, thoracic region — after 



Johnston ....... 546 



310. Diagram showing development of ear in a Vertebrate 



(cartilaginous fish) ...... 548 



311. Diagram showing the ear and related parts in a young cat . 549 



312. Diagram of the eye ...... 550 



313. Development of the eye — after Balfour and Hertwig . 551 



314. Diagram of embryonic pharynx in a Mammal — after Goette . 555 



315. Origin of lungs, liver, and pancreas in the chick — after 



Goette ....... 556 



316. Section through a young newt ..... 557 



317. Section through Elasmobranch embryo — after Ziegler . 559 



318. Blood corpuscles . . . . . . .560 



319. Diagram showing the valves {VA.) common in veins . .561 



320. Diagram of circulation — after Leunis .... 563 



321. Development of excretory system of Vertebrate — in part 



after Boveri ...... 566 



322. Urinogenital system of Chordata Vertebrata . . . 567 



323. Mammalian ovum — after Hertwig .... 572 



324. Median longitudinal section of anterior region of Myxine — 



after Retzius and Parker ..... 576 



325. Respiratory system of hag, from ventral surface . . 577 



