xvi THE WORLD OF LIFE 



FIG. PAGE 



103. Macroscaphites ivanii (Cretaceous Ammonite) . . . 269 



104. Hamites rotundus (Cretaceous Ammonite) . . . 269 



105. Ptychoceras emericianum (Cretaceous Ammonite) . . 269 



106. Ancyloceras matheronianum (Gault Ammonite) . . . 269 



107. Head of Babirusa ........ 275 



1 08. Perspective view of part of a Wing-feather . . . 289 



109. Oblique section showing how the Barbules hook together . 289 

 no. Diagram of Nuclear Division ...... 343 



