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Animals of the Cambrian Period 90     From Knipe's Nebula to Man. A Trilobite 90     Photo: J. J. Ward, F.E.S. The Gambian Mud-Fish, Protopterus 91     Photo: British Museum (Natural History). The Archæopteryx 91     After William Leche of Stockholm. Wing of a Bird, Showing the Arrangement of the Feathers 91 Pictorial Representation of Strata of the Earth's Crust, with Suggestions of Characteristic Fossils (Coloured Illustration) 92 Fossil of a Pterodactyl or Extinct Flying Dragon 94     Photo: British Museum (Natural History). Pariasaurus: An Extinct Vegetarian Triassic Reptile 94     From Knipe's Nebula to Man. Triceratops: A Huge Extinct Reptile 95     From Knipe's Nebula to Man. The Duckmole or Duck-Billed Platypus of Australia 95     Photo: Daily Mail. Skeleton of an Extinct Flightless Toothed Bird, Hesperornis 100     After Marsh. Six Stages in the Evolution of the Horse, Showing Gradual Increase in Size 101     After Lull and Matthew. Diagram Showing Seven Stages in the Evolution of the Fore-Limbs and Hind-Limbs of the Ancestors of the Modern Horse, Beginning with the Earliest Known Predecessors of the Horse and Culminating with the Horse of To-Day 104     After Marsh and Lull. What is Meant by Homology? Essential Similarity of Architecture, though the Appearances May be Very Different 105 An Eight-Armed Cuttlefish or Octopus Attacking a Small Crab 116 A Common Starfish, which has Lost Three Arms and is Regrowing Them 116     After Professor W. C. McIntosh. The Paper Nautilus (Argonauta), an Animal of the Open Sea 117     Photo: J. J. Ward, F.E.S. A Photograph Showing a Starfish (Asterias Forreri) which has Captured a Large Fish 117 Ten-Armed Cuttlefish or Squid in the Act of Capturing a Fish 118 Greenland Whale 118 Minute Transparent Early Stage of a Sea-Cucumber 119 An Intricate Colony of Open-Sea Animals (Physophora Hydrostatica) Related to the Portuguese Man-of-War 119     Photo: British Museum (Natural History). A Scene in the Great Depths 119 Sea-Horse in Sargasso Weed 120 Large Marine Lampreys (Petromyzon Marinus) 120 The Deep-Sea Fish Chiasmodon Niger 120 Deep-Sea Fishes 120 Flinty Skeleton of Venus' Flower Basket (Euplectella), a Japanese Deep-Sea Sponge 121 Egg Depository of Semotilus Atromaculatus 121 The Bitterling (Rhodeus Amarus) 124 Woolly Opossum Carrying her Family 124     Photo: W. S. Berridge. Surinam Toad (Pipa Americana) with Young Ones Hatching out of Little Pockets on her Back 125 Storm Petrel or Mother Carey's Chicken (Procellaria Pelagica) 125 Albatross: A Characteristic Pelagic Bird of the Southern Sea 128 The Praying Mantis (Mantis Religiosa) 138 Protective Coloration: A Winter Scene in North Scandinavia 138 The Variable Monitor (Varanus) 139     Photo: A. A. White. Banded Krait: A Very Poisonous Snake with Alternating Yellow and Dark Bands 140     Photo: W. S. Berridge, F.Z.S. The Warty Chameleon 140     Photos: W. S. Berridge, F.Z.S. Seasonal Colour-Change: Summer Scene in North Scandinavia 141 Protective Resemblance 142     Photo: J. J. Ward, F.E.S. When Only a Few Days Old, Young Bittern Begin to Strike the Same Attitude as their Parents, Thrusting their Bills upwards and Drawing their Bodies up so that they Resemble a Bunch of Reeds 143 Protective Coloration or Camouflaging, Giving Animals a Garment of Invisibility (Coloured Illustration) 144 Another Example of Protective Coloration (Coloured Illustration) 144 Dead-Leaf Butterfly (Kallima Inachis) from India 146 Protective Resemblance between a Small Spider (to the left) and an Ant (to the right) 146 The Wasp Beetle, which, when Moving amongst the Branches, Gives a Wasp-Like Impression 147     Photo: J. J. Ward, F.E.S. Hermit-Crab with Partner Sea-Anemones