xviii LIST OF ILLUSTRATIONS. 
FIG, 
267. Section through a young newt . : ' 
268. Blood corpuscles of Vertebrates . 
269. Diagram of circulation—after Leunis 
270. Development of excretory system of Vertebrate—in part 
after Boveri . . i . 
271. Urogenital system . . . 
272. Mammalian ovum—after Hertwig 
273. Median longitudinal section of anterior end of Myxine— 
after Retzius and Parker r . : 
274. Respiratory system of hag, from ventral surface. 
275. Bdellostoma stouti (Californian hag), aiitiriaiie in sheath of 
mucus—after Bashford Dean 
276. The lamprey (Petromyzon marinus) 
277. Longitudinal vertical section of anterior "end of larval 
lamprey—after Balfour . 
278. Restored skeleton of Palaospondylus gunni—after Traquair 
279. Pterichthys milleré. Lateral view—restored by Traquair" 
280. Under surface of skull and arches of skate—after W. K. 
Parker . 7 : 
281. Side view of skate’s skull—after W. K. Parker F ‘ 
282, Skeleton of skate—from a preparation . . 
283. Dissection of nerves of skate ~ 
284. Side view of chief cranial nerves of Blasmobranchs—sightly 
modified from Cossar Ewart. ‘ : 
285. Spiral valve of skate—after T. J. Parker . 
. Upper part of the dorsal aorta in the skate—after Monro 
. Heart and adjacent vessels of skate—in part after Monro . 
. Urogenital organs of male skate . : 
. Urogenital organs of female skate—in part after Monro ‘ 
. Elasmobranch development—after Balfour . 
Embryo dogfish in egg-case (‘* Mermaid’s purse °) which 
has been cut open to show contents 
. The haddock . 
. External characters of a Teleostean—a carp (Cxprinus 
carpio)—after Leunis 
. Caudal vertebra of haddock . 
. Disarticulated skull of cod—from Edinburgh Museum of 
Science and Art 
. Pectoral girdle and fin of cod—from Edinburgh Museum of 
Science and Art 
Diagram of a Teleostean gill i in section . ‘ 
. Diagram of Teleostean circulation—after Nuhn_ . 
. The early development of the salmon ‘i ‘. ri 
. Development of eel—after Smit . j . : 
. Young skate—from Beard . 
. Lateral view of dogfish (Scyd/éum catulus) . ‘: 
. Outline of Acanthodes sulcatus—after Traquair . 
. Larva of Polypterus (after Budgett), 14 inch in length 
. Sturgeon (Aczpenser sturio) ’. . . P 
. The goldfish (Cyprinus auratus) . . i z 
