LIST OF ILLUSTRATIONS. 



FIG. 



PAGE 



196. Development of excretory system of Vertebrata (Boveri) 462 



197. Urogenital system . • 4°4 



198. Mammalian ovum (Hertwig) . • • 4^7 



199. Median longitudinal section of anterior end of Myxine 



(Retzius) . . . • 471 



200. Respiratory system of hag, from ventral surface . . 472 



201. Longitudinal vertical section of anterior end of larval lam- 



prey (Balfour) .... 475 



202. Restored skeleton of Palceospondylus (Traquair) . . 479 



203. Under surface of skull and arches of skate (W. K. Parker). 484 



204. Side view of skate's skull (W. K. Parker) . . 485 



205. Skeleton of skate . . 486 



206. Dissection of nerves of skate . . . . 490 



207. Side view of chief cranial nerves of Elasmobranchs (Cossar 



Ewart) 492 



208. Spiral valve of skate (T. J. Parker) . . . 493 



209. Upper part of the dorsal aorta in the skate (Monro) 494 



210. Heart and adjacent vessels of skate (Monro) . 495 



211. Urogenital organs of male skate . . 496 



212. Urogenital organs of female skate (Monro) . 497 



213. Elasmobranch development (Balfour) . . . 498 



214. External characters of a Teleostean — a carp (Leunis) 500 



215. Caudal vertebra of haddock . . . 501 



216. Disarticulated skull of cod . 502 



217. Pectoral girdle and fin of cod .... 503 



218. Diagram of Teleostean circulation (Nuhn) . 505 



219. Young skate (Beard) . .... 516 



220. Lateral view of dog-fish, Sey Ilium catulus . 517 



221. Outline of Acanthodes siibcatus (Traquair) . 517 



222. Sturgeon (Acipenser sturid) from side . . 518 



223. Pterichthys milleri, lateral view (Traquair) 519 



224. Skeleton of Ceratodus fin (Gegenbaur) . . , 523 



225. Head region of Protopterus (W. N. Parker) . 524 



226. Vertebral column and pelvic girdle of bull-frog . . 533 



227. Skull of frog — upper and lower surface (W. K. Parker) 534 



228. Pectoral girdle of Rana esculenta (Ecker) 537 



229. Side view of frog's pelvis (Ecker) . , 537 



230. Brain of frog (Wiedersheim) . 1538 



231. Nervous system of frog (Ecker) , c-ia 



232. Arterial system of frog (Ecker) . 1-43 



233. Venous system of frog (Ecker) . . . r.. 



234. Urogenital system of male frog (Ecker) 548 



235. Urogenital system of female frog (Ecker) . 548 



236. Division of frog's ovum (Ecker) . . • S So 



237. Gastrula stage of newt (Hertwig) . . . co 



238. Dissection of tadpole (Milnes Marshall and Bles) 552 



239. Life history of a frog (Brehm) .... rrt 



240. Csecilian {Ichlhyophis) with eggs (Sarasin) ... c<-8 



241. External appearance of tortoise . . . . 56-. 



242. Carapace of tortoise .... ... cg^ 



