The royal natural history . 1522 52 152 15255265275285305325325335345355305375405115425 12 LIST OF ILLUSTRATIONS 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, Peneroplis pertusus, Structure of Orbitolite, Polymorphina, Shells of Globigerina, PAGE 543544545546547550551553553554555556556557557 Pqlystomella, Sarcode Body of Polystomella,Gre
The royal natural history . 1522 52 152 15255265275285305325325335345355305375405115425 12 LIST OF ILLUSTRATIONS 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, Peneroplis pertusus, Structure of Orbitolite, Polymorphina, Shells of Globigerina, PAGE 543544545546547550551553553554555556556557557 Pqlystomella, Sarcode Body of Polystomella,Green Sun-Animalcule (Acanthocystis),Lattice-Animalcule,Mail-Coated Flagellata,Phosphorescent Animalcule (Noctiluca),Pyrocystis, ....Mussel-Animalcule (Stylonychia), .Bell-Animalcule (Vorticetta),Nodding Bell-Animalcule (Epistylis),Rosels Trumpet-Animalcule (Stentor),Marine Animalcule (Acineta),Bud-Bearing Animalcule (Hemiopihrya),Spiral - Mouthed Animalcule {Spirostomuni), .... PAGE 558559560561563563564564565565566567568 568. CHAPTER VIIL Stone-Lilies, Star-Fishes, Sea-Urchins, and Sea-Cucumbers,Subkingdom ECHINODERMATA. Characteristics The star-fish, the sea-urchin, the brittle-star, the feather-star, andof the Group. t\ie sea-cucumber—especially the three former—are well known to allfrequenters of the seashore; while the fossil sea-urchins of the Chalk, whose flint-casts are so common on the downs of England, the so-called screw-stones foundin the Mountain Limestone, the pentremites and crinoids, whose remains are soabundant in some parts of North America, are no less familiar to dwellers these animals differ much from one another in shape, a slight scrutinywill discover many points in which they resemble one another and differ fromother creatures. They and their relatives are, therefore, placed in one great groupof the animal kingdom, the Echinodermata,—a group corresponding in importanceto the Molluscs, or the Vertebrates. This group is, in fact, more cle
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