LIST OF ILLUSTRATIONS 



xv 



Head of Round-worm, 



Human Threadworm, 



Dochmius duodenalis, ' , 



Head of Cucullanus clegans, 



Trichinosis Worm Coiled Up, 



Trichina spiralis, .... 



Larvae of Gordius, 



Eggs and Larva of Mermis, 



Arrowworm, .... 



Proboscis of Tetrastemma, 



Four-Eyed Nemertine ( Tctrastcmma), . 



Cross-Bearing Nemertine, on a Coral, . 



A Nemertine (Pterosoma), 



Pilidium Larva, with Nemertine Worm, 



Human Tapeworms, 



Egg and Embryo (Proscolex) of Tape- 

 worm, ..... 



Bladder Worm Stage (Cysticercus) of 

 Tapeworm, 



Tania echinococcus, . . 



Broad Tapeworm, .... 



Trematode Worms, 



Life History of Double Worm, 



Dactvlocotyle and Anthocot\lc, 



Potvstoiiitiiii and Larva, 



Liver Fluke and Larva, 



Development of Distomum, 



Larval Form of Liver Fluke, 



Mesostomiim tctragonum, 



Trematodes, .... 



Schizostoma producttim, 



Single-Eyed Turbe\\arian(Stenostot/t/n ), 



Structure of a Dendrocoelian, 



Smooth Polycelis, .... 



Two-Striped Geodesmus, 



Planarian Worm (Planar io), 



Tufted Planarian (Thysanozoum) , 



Rhopalura, ..... 



A'Dicyemid, 



Cydippe, ..... 



Venus' Girdle, .... 



Stinging Capsules, 



Physopltoro, .... 



Stephalia, ..... 



Clavatella, ..... 



Pec t is, ..... 



Corymorpha, with Detached Medusa?, . 



Monocaulus, 



Group of Hydractinia, 



Hydractinia, on a Whelk Shell, . 



Millepora, ..... 



Hydra Monster, Artificially Produced, . 



CJirysaora, ..... 



Rhizostoma, .... 



Periphylia, 



3425 

 3426 

 3426 

 3426 

 34 2 7 

 34 2 7 

 3428 

 3428 

 3429 

 3430 

 3430 

 3431 

 3432 

 3433 

 3434 



3435 



3435 

 3436 

 3436 

 3437 

 3438 

 3439 

 3440 

 3440 

 344 1 

 344 1 

 344 2 

 3443 

 3443 

 3444 

 3445 

 3445 

 3445 

 3445 

 3446 

 344 6 

 3447 

 3450 

 3452 

 3454 

 3456 

 3457 

 3459 

 3459 

 3460 



34 61 

 3462 



3463 

 3464 

 3465 

 3466 



3467 

 3468 



PAGfe 



Tessera, ..... 3469 



Monoxenia darivini, . . . 3470 

 Development of Monoxenia, . . 3471 

 Sections of Monoxenia, . . . 3472 

 Outline of Catilastrcea, . . . 3473 

 Larvae of Sea Anemone, . . . 3474 

 A Sea Anemone (Actinia}, . . 3475 

 Endive-Leaved Anemone, . . 3476 

 Short-Tentacled Anemone, . . 3476 

 Parasitic Anemone (Palythoa), on Glass- 

 Rope Sponge, . . 3477 

 Palvthoa axinellce, .... 3478 

 A Simple Coral (Thecocyathus), . . 3479 

 Scarlet Crisp Coral (Flabellum), , 3479 

 Mushroom Coral (Fungia), . . 3480 

 A Deep- Sea Coral (Leptopenus), . 3480 

 A Branching Coral (Dendrophyllia), . 3481 

 A Madrepore Coral (Madrepora), . 3481 

 A Massive Coral (Astroides), . . 3482 

 Developmental Stages of Astroides, . 3483 

 A Star Coral (Astreza), . . . 3484 

 A Brain Coral (Meandrina), . . 3484 

 Mouths of Brain Coral, . . . 3485 

 A Horny Coral (Antipathes), . . 3485 

 An Alcyonarian Coral (Alcyonium), . 3486 

 A Sea-Pen (Pteroides'), . . . 3487 

 Umbellula tJiomsoni, . . . 3488 

 Umbellula encrinus, . . . 3488 

 A Sea Fan (Gorgonia), . . . 3489 

 Corkscrew Sea Fan (Streptocaulus), . 3490 

 Red Coral, ..... 3491 

 Organ-Pipe Coral ( Ttibipora), . . 3491 

 Structure of Tubipora, . . . 3491 

 Island with Fringing and Barrier Reefs, 3495 

 Coral Island or Atoll, >. . . 3496 

 Section through a Coral Reef, . . 3497 

 Diagram Explaining Theory of Subsi- 

 dence, ..... 3499 

 Outline of the Island of Aiva, . . 3499 

 Mouths of Madrepore, . . . 3500 

 Bread-Crumb Sponge, Showing Currents, 3501 

 Flagellated Chambers of Sponges, . 3502 

 Sponges Growing on Seaweed, . . 3503 

 Carpenter's Glass-Sponge, . . 3505 

 Structure of Venus's Flower Basket, . 3507 

 An Ascon Sponge, . . . 3507 

 Structure of Toilet Sponge, . . 3508 

 Calcareous Ascon Sponge (Leucosolenia), 3509 

 A Calcareous Leucon Sponge (Leucan- 



dra), . . . . 35io 



Development of Sycon raphanus, . 3511 



Siliceous Sponge Spicules, . 3512 



Siliceous Spicules of Anchor Sponges, . 3515 

 Sea Kidney Leather Sponge (Chon- 



drosia), . . . .3516 



