LIST OF ILH^STRATIOKS xxvii 



PAOIE 



rlG. 



367. Chietopterus 4gy 



368. Setre of vtirious Polychieta . 47O 



369. Section of .setigerous .sac nf an 01igoch;tite 47(J 



370. Polynoe extenuata, antei'i(jr end . . 47 1 



371. Polychasta, various, heads 473 



372. Tubifex 473 



373. Terebella 474 



374. Aphrodita, enteric canal 475 



375. Saccocirrus, transverse section 477 



376. Phyllodoco, nephridium . 479 



377. Nephridia and ooelomoducts . 480 



378. Diagram illustrating development of gonad of Polychwta 482 



379. Spirorbis l;evis . . , . . 484 



380. Eupomatus, development of trochophore 485 



381. Autolytus cornutus, budding . 487 



382. Syllis ramosa . . . 487 



383. Serpulse with their tubes . 483 



384. Myzostomum ... . . . 490 



38.5. ,, anatomy . 491 



386. Sipunculus nudus, anterior extremity ... 492 



387. „ ,, tentacular fold . 493 



388. ,, ,, anatomy 494 



389. „ „ nervous system 494 



390. Bonellia viridis, female 497 



391. Echiurus 497 



392. Priapulus . . 498 



393. Bonellia, anatomy 499 

 .394. Echiurus, ciliated funnel 499 



395. ,, anatomy . 500 



396. ,, nervous system , . 500 



397. Bonellia, male . . 501 



398. Echiuru.s, trochophore . . 501 



399. Polygordius neapolitanus . . 503 



400. Protodrilus . 504 



401. Polygordius neapolitanus, tran.sverse section . 504 



402. ,, ,, trochophore . . 505 



403. ,, ,, ,, later stage . 505 



404. Hirudo medicinalis .... . . . 507 



405. ,, ,, transverse section . . 508 



406. „ „ jaw . . . . 509 



407. ,, australis, dissection from dorsal aspect . . 510 



408. ,, australis, ,, „ left side . . 511 



409. ,, medicinalis, nephridium . . ... 512 



410. ,, diagram of blood-channels 513 



411. ,, section of eye . . 514 



412. ,, cocoon ... 515 



413. Three Rhynchobdellida 517 



414. Proboscis of Clepsine ... 518 



