﻿236 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  (Sim.) 
  coronatus 
  of 
  Schlotheim, 
  and 
  the 
  Am. 
  dubius 
  of 
  Zieten. 
  It 
  

   would 
  have 
  taken 
  up 
  so 
  much 
  space 
  to 
  have 
  described 
  at 
  any 
  length 
  

   the 
  foregoing 
  genera 
  of 
  the 
  Ammonitidse 
  that 
  all 
  save 
  necessary 
  

   matter 
  is 
  omitted. 
  This 
  subject 
  alone 
  is 
  so 
  large 
  a 
  one, 
  and 
  its 
  

   bearing 
  upon 
  stratigraphical 
  geology 
  so 
  important, 
  that 
  I 
  deemed 
  it 
  

   right 
  to 
  notice 
  it, 
  but 
  at 
  the 
  same 
  time 
  to 
  reduce 
  the 
  matter 
  to 
  its 
  

   smallest 
  limits. 
  The 
  most 
  important 
  resume 
  of 
  the 
  modern 
  classi- 
  

   fication 
  is 
  given 
  in 
  vol. 
  xxxiii. 
  of 
  the 
  Memoirs 
  of 
  the 
  Palaeonto- 
  

   graphical 
  Society 
  by 
  Dr. 
  "Wright, 
  F.R.S. 
  ; 
  he 
  has 
  embodied 
  the 
  

   researches 
  of 
  Suess, 
  Neumayer, 
  Waagen, 
  Hyatt, 
  Mojsisovics, 
  

   D'Orbigny, 
  &c. 
  It 
  is 
  the 
  only 
  English 
  digest 
  we 
  have 
  upon 
  the 
  

   modern 
  classification 
  of 
  this 
  division 
  of 
  the 
  Cephalopoda, 
  and 
  

   which 
  gives 
  us 
  the 
  views 
  of 
  continental 
  palaeontologists. 
  Messrs. 
  

   Tate 
  and 
  Blake, 
  in 
  their 
  work 
  on 
  the 
  Yorkshire 
  Lias, 
  have 
  ably 
  

   treated 
  of 
  the 
  Ammonitida? 
  of 
  that 
  formation. 
  

  

  