LIST OF 

 BLACK-AND-WHITE ILLUSTRATIONS 



PAGE 



1. Sketch Map showing routes probably followed by the Mammalia in their 



migrations towards Britain 13 



2. All that remains of the Whale's Hind Limbs {Balcena). From a specimen in 



Museum of College of Surgeons 20 



r Grampus or Killer {Orca gladiator) 1 



j Common Porpoise {Phocana communis) ...... f s '* 



4. Teeth of Porpoise (after Flower). Magnified to twice natural size ... 25 



5. The Killer Whale {Orca gladiator) 27 



6. Head of Black Fish (^Globicephalus) . . 29 



7. Head and Flipper of Risso's Grampus (^Grampus griseus) . . -31 



8. Common Dolphin (^Delphinus delphis) to show Markings. Note the white iris 



of the eye . . .......... 35 



9. Skull of Sperm Whale {Physeter macrocephalus) ... • • 37 



10. Head of Bottle-nosed Whale (^Hyperoodon rostratus) 40 



11. Sowerby's Whale {Mesoplodon bidens). Head and skull, showing single pair 



of teeth in lower jaw and remarkable frontal crest of bone . . 43 



12. Clione limacina. The little Pteropod Mollusc (bright purple in colour) on which 



the great Whalebone Whales feed. Life size 45 



13. Hump-backed Whale {Megaptera boops) . . 47 



J Hedgehog rolled up 



(^ Common Hedgehog (^Erinaceus europceus) .... 



15. Skulls of Insectivores, to show Teeth. A. Hedgehog (natural size) ; B. Mole 



(natural size) ; C. Lesser Shrew (2J times natural size) . . . -56 



16. Hand of Mole .... 60 



17. Right Foot of Mole 60 



18. Plan of the Interior of an Ordinary Molehill 65 



19. Plan of a more elaborate Mole "Fortress (after Mr. Lionel E. Adams) . 67 



(Common Shrew (_Sorex vulgaris) ) 



The Lesser Shrew (Sorex minuius) V Facing 70 

 The Water Shrew {Crossopus fodiens) jaAes water . . . .J 



21. The Water Shrew (Crossopus fodiens) 74 



xiii 



