XVI 



LIST OF ILLUSTRATIONS 



A Calcareous Leucon Sponge (Leucandra) 



Development of Sycon raphanus, . 



Siliceous Sponge- Spicules, 



Siliceous Spicules of Anchor-Sponges, 



Sea Kidney Leather-Sponge (Chondrasia) 



A Single-Rayed Sponge (Axinella), 



Siliceous Spicules of Monaxonid Sponges, 



Esperiopsis challengeri, 



Limestone Bored by Sponge, 



Embryo of Fresh- Water Sponge, . 



Section of Common Bath-Sponge, 



Ascetta primordialis, 



Proteus Animalcule, 



Proteus Animalcule (highly magnified), 



Orange-Coloured Protomyxa, 



Young Capsuled Animalcule (Arcella), 



Egg-Shaped Gromia, 



Hyperammina and Astrorhiza, 



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Peneroplis pertusus, 



Structure of Orbitolite, . . 



Polymorphina, 



Shells of Globigerina, 



Polystomella, 



Sarcode Body of Polystomella, 



Green Sun- Animalcule (Acanihocysti 



Lattice- Animalcule, 



Mail-Coated Flagellata, 



Phosphorescent Animalcule (Noctiluca), 



Pyrocystis, .... 



Mussel- Animalcule (Stylonychia), . 



Bell- Animalcule (Vorticella), . 



Nodding Bell- Animalcule (Epistylis), 



Rosel's Trumpet- Animalcule (Stentor), 



Marine Animalcule (Acineta), 



Bud-Bearing Animalcule (Hemiophrya), 



Spiral-Mouthed Animalcule (Spirostomum), 



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