XVI LIST OF ILLUSTRATIONS 



FlO; 



219. Longitudinal vertical section through a female Lara prey, 



Petromyzon marinus ... .... 



220. Three views of the skull of Petromyzon marinus, from 



different aspects . . . . 



221. Section through the skin of an Elasmobranch showing 



formation of a dermal spine ...... 



222. Diagram of a section through the jaw of a Shark, Odon- 



taspis americanus . 



223. Lateral view of the skull of a Dogfish, Scyllium canicula . 



224. Dorso-lateral view of the pectoral girdle and fins of a Dogfish, 



Scyllium^ canicula . ... 



225. Dorsal view of the pelvic girdle and fins of a male Dogfish, 



Scyllium canicula . ... . 



226. Dissection of Scyllium canicula, so as to show the viscera 



viewed from the ventral aspect ..... 



227. Dissection of Scyllium canicula, so as to show the viscera 



seen from the right side .... , 



228. Scyllium canicula, and opened egg-case of the same . 



229. A Ray, Raia maculata ....... 



230. Skull of a male Chimaera monstrosa . 



231. Chimaera monstrosa ........ 



232. Diagrams illustrating the mode of formation of the vertebral 



column in Teleostei . 474 



233. Lateral view of the cartilaginous qranium of a Salmon, Salmo 



salar ........ . 476 



234. Dorsal and ventral views of the cranium of a Salmon, Salmo 



salar, from which the membrane bones have been re- 

 moved . . . 477 



235. Mandibular and hyoid arches of a Cod, Gadus morrhua . 478 



236. Lateral view of the skull of a Salmon, Salmo salar . . 480 



237. The right half of the pectoral girdle and the right pectoral 



fin of a Cud, Gadus morrhua ...... 482 



238. Dissection of a Roach, Leuciscus rutilus, to show the brain, 



gills, and viscera . 485 



239. Diagram illustrating the arrangement of the heart and 



branchial vessels in a Teleostean fish .... 488 



240. A Cat-fish, Amiurus catus 492 



241. The Plaice, Pleuronectes platessa . . . . . . 494 



242. Three stages in the development of the vertebral column 



of Lepidosteus . - . . . . . . . 497 



243. Three stages in the development of the vertebral column 



_of Amia . 



244. The Sturgeon, Acipenser sturio ...... 



245. Polypterus ......... 



246. Lepidosiren paradoxa . . . . . 



