LIST (3F ILLUSTRATIONS xxiii 



PAGE 



^ 



279. Starfish, portion of vertical section of arm ..... 351 



280. ,, diagrammatic sections ........ 352 



281. Asterias rubens, digestive system ........ 353 



282. Astropecten, section of stone-canal ....... 354 



283. Anthenea flavescens, dissection from dorsal aspect .... 355 



284. ,, lateral dissection ...... 356 



285. ,, dorsal surface ....... 357 



286. ,, ,, ventral surface ....... 357 



287. Asterina gibbosa, development ........ 359 



288. ,, ,, ,, ........ 360 



289. ,, ,, bipinnaria ......... 360 



290. ,, ,, ........ 361 



291. ,, exigua, young after metamorphosis ..... 361 



292. Apical system of young Starfish ........ 362 



293. Strongylocentrotus ........... 364 



294. Corona of Sea-urchin . ...... . 365 



295. Apical disc of Sea-urchin ... ..... 365 



296. Echinus, lantern of Aristotle .... .... 366 



297. Sea-urchin, anatomy, lateral view .'....... 367 



298. ,, ,, oral view . . . . . . . .368 



299. Cucumaria planci ........... 369 



300. Anatomy of a Holothuriaii ......... 371 



301. Antedon ............. 373 



302. ,, disc .... ........ 374 



303. ,, transverse section of pinnule ....... 375 



304. ,, sagittal section .......... 376 



305: Anthenea, ventral view ....... . . 385 



306. Ophioglypha lacertosa . ... 386 



307. Astrophyton arborescens ...... 387 



308. Strongylocentrotus ........... 388 



309. Diagram of spine of Sea-urchin. ........ 389 



310. Pedicellaria of Arbacia punctulata . . 389 



311. Hemipneustes radiatus .......... 390 



312. Clypeaster sub-depressus ......... 390 



313. Antedon ........ ... 391 



314. Metacrinus interruptus .......... 392 



315. Development of Echinoderms ........ 397 



316. ,, ,, Antedon ......... 398 



317. Diagram to illustrate the relationships of the classes of Echino- 



dermata .............. 402 



318. Nereis dumerilii ...... . 404 



319. ,, ,, parapodium . ...... 405 



320. ,, setse . .405 



321. ,, ,, anatomy .... 407 



322. ,, ,, transverse section . . . . . . 408 



323. ,, nervous system ..... . . ... 410 



324. ,, eye ....... 411 



325. ,, dumerilii, nephridium 



326. ,, development ..... 414 



