LIST OF ILLUSTRATIONS 



IX 



Human Thread-Worm, 



Ihchmius duodenalis, 



Head of Cucullanus elegans, 



Trichinosis Worm Coiled Up, 



Trichina spiralis, . 



Larvae of Gordius, . 



Eggs and Larva of Mermis, 



Arrow- Worm, 



Proboscis of Tetrastemma, . 



Four-Eyed Neniertine (Tetrastemma), 



Cross-Bearing Nemertine, on a Coral, 



A Nemertine (Pterosoma), . 



Pilidium Larva, with Nemertine Worm, 



Human Tape-Worms, 



Egg and Embryo (Proscolex) of Tape 



Worm, 

 Bladder- Worm Stage (Cysticercus) of Tape 



Worm, 

 Taenia echimococcus, 

 Broad Tape-Worm, 

 Trematode Worms, 

 Life-History of Double- Worm, 

 Dactylocotyle and Anihocotyle, 

 Polystomum and Larva, 

 Liver-Fluke and Larva, 

 Development of Distomum, 

 Larval Form of Liver-Fluke, 

 Mesostomum tetragonum, 

 Trematodes, 

 Schizostoma productum, 

 Single-Eyed Turbellarian (Stenostomum), 

 Structure of a Dendroccelian, 

 Smooth Polycelis, . 

 Two-Striped Geodesraus, . 

 Planarian Worm (Planaria), 

 Tufted Planarian (Thysanozoum), . 

 Rhopalura, . 

 A Dicyemid, 

 Cydippe, 

 Venus' Girdle, 

 Stinging Capsules, . 

 Physophora, 

 Stephalia, . 

 Clavatella, . 



Pedis, .... 



Corymorpha, with Detached Medusae, 

 Monocaulus, 

 Group of Hydractinia, 

 Hydractinia on a Whelk-Shell, 

 Millepora, .... 

 Hydra Monster, Artificially Produced, 

 Ohrysaora, .... 

 Rhizostoma, 

 Periphylia, .... 



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Tessera, 



Monoxenia darwin i, 



Development of Monoxenia, 



Sections of Monoxenia, 



Outline of Caulastrcea, 



Larvse of Sea- Anemone, . 



A Sea- Anemone (Actinia), 



Endive-Leaved Anemone, . 



Short- Tentacled Anemone, 



Parasitic Anemone (Palythoa), on Class 



Rope Sponge, . 

 Palythoa axinellce, . 

 A Simple Coral (Thecocyathus), 

 Scarlet Crisp Coral (Flabellum), 

 Mushroom-Coral (Fungia), 

 A Deep-Sea Coral (Leptopenus), . 

 A Branching Coral (Lkiidrophyllia), 

 A Madrepore Coral (Madrcpuria), 

 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 thonrpsoni, 

 Umhdlula encrinus, 

 A Sea-Fan (Goryonia), 

 Corkscrew Sea-Fan (Streptocaulvs), 

 Red Coral, .... 

 Organ-Pipe Coral (Tubiporo), 

 Structure of Tubipora, 

 Island with Fringing- and Barrier-Reefs, 

 Coral-Island, or Atoll, 

 Section through a Coral- Reef, 

 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), 

 A Calcareous Leucon Sponge (/.< ucandra 

 Development of Sycon nij>h<inn*, . 

 Siliceous Sponge-Spicules, 

 Siliceous Spicules of Anchor-Sponges, 

 Sea Kidney Leather-Sponge (Chondn 

 A Single-Bayed Sponge (A&inella), 

 Siliceous Spicules of Monaxonid Sj ges, 



l' UJE 



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