﻿38 
  

  

  Mr. 
  F. 
  E. 
  Beddard 
  on 
  the 
  

  

  not 
  concealed 
  by 
  the 
  narrow 
  anterior 
  part 
  of 
  the 
  palatines 
  

   which 
  underlie 
  them; 
  in 
  Podiceps 
  cornutus 
  the 
  maxillo-pala- 
  

   tines 
  are 
  much 
  slighter 
  and 
  only 
  just 
  appear 
  on 
  the 
  inner 
  

   side 
  of 
  the 
  palatines. 
  Poclica 
  seneyalenis 
  (figs. 
  4 
  and 
  5) 
  is 
  

   more 
  Rail-like 
  than 
  Grebe-like 
  in 
  this 
  structural 
  feature. 
  On 
  

   the 
  other 
  handj 
  the 
  American 
  Fin-foot 
  is 
  rather 
  more 
  Grebe- 
  

   like 
  than 
  Rail-like. 
  The 
  maxillo-palatines 
  are 
  thin 
  curved 
  

  

  Fi-. 
  4. 
  

  

  Skull 
  of 
  Podica 
  senegalensis, 
  lateral 
  view 
  ; 
  nat. 
  size. 
  (From 
  P. 
  Z. 
  S. 
  

   1800, 
  p. 
  433.) 
  

  

  Skull 
  of 
  Podica 
  senegalensis, 
  ventral 
  view 
  ; 
  nat. 
  size. 
  (From 
  P. 
  Z. 
  S. 
  

   1890, 
  p. 
  434.) 
  

  

  plates 
  of 
  bone, 
  which 
  are 
  even 
  less 
  exposed 
  than 
  in 
  Podiceps 
  

   cornutus 
  when 
  the 
  skull 
  is 
  viewed 
  from 
  below 
  ; 
  this 
  is 
  owing 
  

   to 
  the 
  fact 
  that 
  they 
  are 
  more 
  curved, 
  with 
  the 
  hollow 
  surface 
  

   directed 
  outwards 
  ; 
  in 
  the 
  Grebe 
  these 
  plates 
  are 
  nearly 
  

   parallel 
  with 
  the 
  long 
  axis 
  of 
  the 
  skull, 
  the 
  concave 
  surface 
  

   being 
  directed 
  downwards 
  : 
  in 
  reality, 
  therefore, 
  the 
  resem- 
  

   blance 
  of 
  the 
  maxillo-palatines 
  of 
  Heliornis 
  to 
  those 
  of 
  the 
  

   Rail 
  is 
  closer 
  than 
  to 
  those 
  of 
  the 
  Grebe 
  ; 
  the 
  outer 
  plate 
  of 
  

   bone 
  which 
  would 
  convert 
  the 
  thin 
  scroll-like 
  maxillo-palatines 
  

   of 
  Heliornis 
  into 
  the 
  inflated 
  maxillo-palatines 
  of 
  Ocydromus 
  

   or 
  of 
  Podica 
  is 
  wanting. 
  In 
  the 
  Grebe 
  the 
  form 
  and 
  

   direction 
  of 
  the 
  maxillo-palatines 
  are 
  such 
  that 
  an 
  additional 
  

  

  