ILLUSTRATIONS 



X 1 X 



FIG. 



2 5 8. 



259. 



260. 



26l. 



262. 



263. 



264. 



265. 



266. 



267. 



268. 



26g. 



270. 



271. 



272. 



273- 

 274. 



275. 



276. 



277. 



278. 



279. 



280. 



281. 



282. 



283. 



284. 



285. 



2S6. 



287. 



288. 



289. 



290. 



291. 



292. 



293- 

 294. 

 295. 

 296. 

 297. 

 298. 

 299. 

 300. 

 301. 

 302. 



IKMV 



dual 



Teredo navalis 



Borings of Teredo navalis 



Sepia cultrata, exterior 



Sepia cultrata, anatomy 



Argonauto argo, male . 



Nautilus pompilius, shell 



Spirilla peronii 



Loligo vulgaris 



Argonauto argo, female 



. Ifgonauto argo, shell 



Octopus vulgaris . 



Rhabdopleura 



( ephalodiscus, gelatinous investment 



Cephalodiscus, a single 



Balanoglossus 



Tornaria 



Ascidia 



Clavellina lepadiformis 



Doliolitui 



Botry 'litis violate us 



Pyrosoma 



Salpa democratica 



Amphioxus lanceolatus, exterior 



Amphioxus lanceolatus, anatomy 



Petromyzon wilderi 



Petromyzon marinus, oral funnel 



Petromyzon marinus, anterior anatomy 



Mustelus antarcticus 



Scyllium canicula . 



Lamna cornubica . 



Raia maculata 



Egg case of dogfish 



Chimara monstrosa and Callorhy 



. I, ipenser sturio . 



Lepidosteus platystomus 



Amia calva . 



Leuciscus rutilus . 



Salmo fario, dissected . 



A/uiurus eatus . '. 



Salmi> fario, exterior 



Salmo fario, caudal skeleton 



Gadus morrhua . 



Pleuronectes cynoglossus 



Gasterosteus pungitius . 



Anabas scandens . 



iu 



/ins 



antarcticus 



249 

 249 



250 

 2C2 



253 

 254 



2 S5 

 256 



257 

 257 

 258 

 260 

 261 

 262 

 263 

 263 

 264 

 264 

 265 

 266 

 266 

 267 

 268 

 269 

 271 

 272 



273 

 275 

 277 

 278 

 279 

 280 

 28l 

 284 

 284 

 285 

 286 

 288 

 290 

 29I 

 292 

 292 



293 

 294 



295 



