XVI 



THE WORLD OF LIFE 



103. Macroscaphites ivanii (Cretaceous Ammonite) . 



104. Hamites rotundus (Cretaceous Ammonite) 



105. Ptychoceras emericianum (Cretaceous Ammonite) 



106. Ancyloceras matheronianutn (Gault Ammonite) . 



107. Head of Babirusa ...... 



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



109. Oblique section showing how the Barbules hook together 



1 10. Diagram of Nuclear Division .... 



