24 



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 {Balana). From a specimen in 



Museum of College of Surgeons .20 



(Grampus or Killer (Orca gladiator) I _ . 

 V Facing 

 Common Porpoise {Phocana communis) . . • • ■ • I 



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



5. The Killer Whale {Orca gladiator) 27 



6. Head of Black Fish {Globicephahts) 29 



7. Head and Flipper of Risso's Grampus {Grampus grisetis) . . . -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 loops) 47 



^^/ Hedgehog rolled up \ Facing 54 



y Common Hedgehog (^Erinaceus eiirop(sus) . . • . • | 



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



(natural size) ; C. Lesser Shrew (2^ times natural size) . . . -5^ 



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 

 f Common Shrew (^Sorex vtdgaris) . . . . . . . "^ 



20,^ The Lesser Shrew {_Sorex minutus) . . . . . . .J- Facing 70 



\_ The Water Shrew (jCrossopus fodiens') jxn^ti water . . . .J 



21. The Water Shrew {Crossopus fodiens) ........ 74 



xiii 



