lO ILLUSTRATIONS 



19. (b). Enlarged view of a "feeler", showing the 



entrance to the statocyst 222 



(c). The arrangement of the sensory cells and 



sand granules inside the statocyst 222 



20. A mosquito at rest with the hind feet raised 



from the perch 223 



Half-tone Illustrations 



{Between pages 120 and 121) 



Scottish wild cat Frontispiece 



1. Dragonfly, showing the huge compound eyes 



2. South American giant toads 



3. Head of a Tawny Owl, showing third eyelid 



4. Marsh Frog, showing external ear-drum 



5. Fox-cubs with ears pricked 



6. Emperor Moth, showing large feathery antennae 



7. A Grass Snake's tongue — its organ of smell 



8. Convolvulus Hawk Moth drawing in sweet nectar 



9. Tongue of a frog touching a worm 



10. A Ringed Plover beside its nest 



1 1 . Quin scallops swimming away from a starfish 



12. A Mouse-eared Bat in flight 



13. Close view of the face of a Greater Horse-shoe Bat 



14. A tame dolphin towing a girl on a surf-board 



15. A whale tragedy 



16. A mother Grey Seal identifying her pup by snifling 



17. Cave Swiftlets on their nests 



18. Close-up of Swiftlet nests 



19. A Western Diamond-back Rattlesnake, showing the 



sensory pit 



20. The Manx Shearwater that homed across the Atlantic 



