xxii LIST OF ILLUSTRATIONS 



FIG. PAGE 



182. Sepia cultrata 297 



183. Nautilus pompilius 298 



184. Nautilus pompilius, section of shell 299 



185. Spirula peronii 301 



1 86. Sepia cultrata, shell 301 



187. Loligo vulgaris 302 



1 88. Argonauta argo 303 



189. Chromatophore of Sepia 304 



190. Sepia cultrata, dissected 305 



191. Nautilus pompilius, anatomy 306 



192. Sepia officinalis, jaws 307 



193. Sepia officinalis, enteric canal 307 



194. Nautilus pompilius, oral surface of male and female . . 309 



195. Balanoglossus 311 



196. Balanoglossus, diagrammatic sagittal section of anterior end . 312 



197. Ascidia . 314 



198. Ascidia 315 



199. Ascidia, diagram of longitudinal section . . . . 317 



200. Ascidia mammillata, larva . 320 



201. Diagram of metamorphosis of larva into fixed Ascidian . 321 



202. Botryllus violaceus 322 



203. Amphioxus lanceolatus, ventral and side view . . . 323 



204. Amphioxus, diagram of anatomy 325 



205. Amphioxus lanceolatus, sections 327 



206. Dogfish, fins, etc. 329 



207. Lacerta viridis ......... 330 



208. Lepus cuniculus, lateral view of skeleton with outline of body . 331 



209. Scyllium, vertebrae 334 



210. Lizard, vertebrae of 335 



211. Lepus cuniculus 336 



212. Scyllium canicula 338 



213. Lacerta agilis, three views of skull 340 



214. Fore and hind limbs of vertebrate, diagram . . . 341 



215. Tooth, longitudinal section, semi-diagrammatic . . . 343 



216. Scyllium canicula, dissection 345 



217. Lacerta agilis, viscera in their natural relations . . . 348 



218. Circulation of a fish, diagram 351 



219. Scyllium canicula, brain, dorsal view 353 



