LIST OF ILLUSTRATIONS 



xv 



PAGE 



Front End of Thread-Worm, . . 449 



Development of Thread- Worm, . . 450 

 Vinegar-Eel, . . . .451 

 Rhabditis and Rhabdonema, . .451 



Humble-Bee Thread-Worm, . . 452 



Human Eound Worm, . . . 453 



Head of Eound Worm, . . . 453 



Human Thread-Worm, . , . 454 



Dochmius duodenalis, . . . 454 



Head of Cucullanus elegans, . . 454 



Trichinosis Worm Coiled Up, . . . 455 



Trichina spiralis, . . . . 455 



Larvse of Gordius, . . , 456 



Eggs and Larva of Mermis, . . 456 



Arrow- Worm, .... 457 



Proboscis of Tetrastemma, . . . 457 



Four-Eyed Nemertine (Tetrastemma\ . 458 



Cross- Bearing Nemertine, on a Coral, . 459 



A Nemertine (Pterosoma), . . . 460 



Pilidium Larva, with Nemertine Worm, . 461 



Human Tape-Worms, . . . 461 

 Egg and Embryo (Proscolex) of Tape- 

 Worm, . . . .462 

 Bladder- Worm Stage (Cysticercus) of Tape- 

 Worm, . . . .462 



Tcenia echinococcus, . . . 463 



Broad Tape- Worm, . . . 463 



Trematode Worms, . . . 464 



Life-History of Double- Worm, . . 465 



Dadylocotyle and Anthocotyle, . . 466 

 Polystomum and Larva, . . .467 



Liver-Fluke and Larva, . . . 467 



Development of Distomum, . . 468 



Larval Form of Liver- Fluke, . . 468 



Mesostomum tetragonum, . . . 469 



Trematodes, .... 470 



Schizostoma produdum, . . . 470 



Single-Eyed Turbellarian (Stenostomum), . 471 



Structure of a Dendrocoelian, . . 472 



Smooth Polycelis, .... 472 



Two- Striped Geodesmus, . . . 472 



Planarian Worm (Planaria), . . 472 



Tufted Planarian (Thysanozowri), . . 473 



Rhopalura, ..... 473 



A Dicyemid, .... 473 

 Cydippe, . . . . .476 



Venus' Girdle, .... 478 



Stinging Capsules, .... 480 



Physophora, .... 482 



Stephalia, ..... 483 



Clavatella, ..... 485 

 Pedis, . . . . .485 



Corymorpha, with Detached Medusse, . 486 



Monocaulus, . . . 487 



Group of Hydractinia, 

 Hydractinia on a Whelk-Shell, 



Hydra Monster, Artificially Produced, 



Chrysaora, .... 



Ehizostoma, 



Periphylia, . 



Tessera, 



Monoxenia darwini, 



Development of Monoxenia, 



Sections of Monoxenia, 



Outline of Caulastrcea, 



Larvae of Sea- Anemone, . 



A Sea- Anemone (Adinia), 



Endive- Leaved Anemone, . 



Short- Tentacled Anemone, 



Parasitic Anemone (Palythoa), on Glass- 



Eope Sponge, . 

 Palythoa axinellce, . 

 A Simple Coral (Thecocyathus), 

 Scarlet Crisp Coral (Flabellum), . 

 Mushroom -Coral (Fungia), 

 A Deep-Sea Coral (Leptopenus), . 

 A Branching Coral (Dendrophyllia), 

 A Madrepore Coral (Madreporia), 

 A Massive Coral (Astroides), 

 Developmental Stages of Astroides, 

 A Star- Coral (Astrcea), 

 A Brain- Coral (Meandrina}, 

 Mouths of Brain- Coral, 

 A Horny Coral (Antipathes), 

 An Alcyonarian Coral (Alcyonium), 

 A Sea-Pen (Pteroides), 

 Umbellula thompsoni, 

 Umbellula encrinus, 

 A Sea-Fan (Gorgonia), 

 Corkscrew Sea-Fan (Streptocaulus), 

 Eed Coral, . 



Organ-Pipe Coral (Tubipom), 

 Structure of Tubipora, 

 Island with Fringing- and Barrier- Eeefs, 

 Coral- Island, or Atoll, 

 Section through a Coral- Eeef, 

 Diagram Explaining Theory of Subsidence, 

 Outline of the Island of Aiva, 

 Mouths of Madrepore, 

 Bread-Crumb Sponge, Showing Currents, 

 Flagellated Chambers of Sponges, 

 Sponges Growing on Seaweed, 

 Carpenter's Glass-Sponge, 

 Structure of Venus' Flower-Basket, 

 An Ascon Sponge, . 

 Structure of Toilet-Sponge, 

 Calcareous Ascon Sponge (Leucosolenia), . 



PAGE 



488 

 489 

 490 

 491 

 492 

 493 

 494 

 495 



49e 



497 

 498 

 499 

 50O 

 501 

 502 

 502 



503 



504 



505 



505 



506 



506 



507 



507 



508 



509 



509 



510 



510 



510 



512 



513 



514 



514 



515 



516 



517 



517 



517 



520 



521 



522 



524 



524 



525 



526 



527 



528 



530 



532 



532 



533 



534 



