﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  

  

  227 
  

  

  total 
  number 
  of 
  genera 
  and 
  species 
  known 
  in 
  the 
  several 
  Classes 
  is 
  

   stated 
  in 
  the 
  two 
  left-hand 
  columns, 
  and 
  all 
  through 
  the 
  Table 
  the 
  

   numbers 
  of 
  genera 
  and 
  species 
  are 
  expressed 
  in 
  their 
  respective 
  hori- 
  

   zons 
  or 
  formations, 
  from 
  the 
  Lower 
  Lias 
  to 
  the 
  Portland 
  Beds. 
  

   Each 
  individual 
  square 
  in 
  the 
  Table 
  states 
  the 
  value 
  of 
  both 
  genera 
  

   and 
  species 
  expressed 
  fractionally, 
  the 
  upper 
  figures 
  stating 
  the 
  

   number 
  of 
  genera 
  in 
  the 
  Class, 
  and 
  the 
  lower 
  the 
  number 
  of 
  species. 
  

   These 
  will 
  be 
  found 
  to 
  agree 
  with 
  the 
  text 
  all 
  through 
  my 
  address 
  

   when 
  named. 
  This 
  Table 
  is 
  suggestive, 
  and 
  shows 
  how 
  much 
  has 
  

   been 
  done 
  in 
  the 
  Jurassic 
  rocks 
  and 
  how 
  much 
  has 
  still 
  to 
  be 
  done 
  

   to 
  fill 
  in 
  the 
  wanting 
  genera 
  and 
  species. 
  The 
  right-hand 
  column 
  

   gives 
  the 
  number 
  of 
  occurrences 
  or 
  appearances 
  of 
  genera 
  and 
  

   species 
  in 
  the 
  several 
  Classes 
  through 
  time. 
  This 
  census 
  of 
  the 
  

   Jurassic 
  species, 
  brought 
  down 
  to 
  1882, 
  may 
  form 
  the 
  basis 
  of 
  

   comparison 
  at 
  some 
  future 
  date 
  when 
  it 
  is 
  deemed 
  of 
  sufficient 
  

   interest 
  (perhaps 
  in 
  another 
  twenty 
  years) 
  to 
  show 
  the 
  increase 
  of 
  

   the 
  fauna 
  and 
  flora 
  of 
  the 
  Lower 
  Secondary 
  Rocks 
  of 
  the 
  British 
  

   Islands. 
  

  

  Table 
  XLV. 
  — 
  Showing 
  the 
  whole 
  number 
  of 
  Genera 
  and 
  Species 
  

   known 
  in 
  the 
  Jurassic 
  Rocks; 
  and 
  also 
  the 
  ivhole 
  occurrences 
  

   and 
  appearances 
  of 
  both 
  the 
  Genera 
  and 
  Species. 
  

  

  (This 
  Table 
  and 
  Table 
  XLYI. 
  are 
  both 
  compiled 
  from 
  the 
  chief 
  

   total 
  results 
  given 
  in 
  Table 
  XLIV.) 
  

  

  Classes. 
  

  

  Plantse 
  

  

  Amorphozoa 
  . 
  . 
  . 
  

  

  Rkizopoda 
  

  

  Coelenterata 
  ... 
  

   Echinodermata 
  

  

  Annelida 
  

  

  Crustacea 
  

  

  Bryozoa 
  

  

  Brachiopoda 
  . 
  . 
  . 
  

   Monomyaria 
  . 
  . 
  . 
  

  

  Dimyaria 
  

  

  Gasteropoda 
  ... 
  

   Ammonites 
  . 
  . 
  . 
  

   Ancyloceras 
  ... 
  

  

  Nautili 
  

  

  Belemnites 
  ... 
  

  

  Teuthidae 
  

  

  Pisces 
  

  

  Eeptilia 
  

  

  Mammalia 
  

  

  Known 
  number 
  of 
  

  

  Genera. 
  Species 
  

  

  5 
  

  

  61 
  

  

  30 
  

  

  4 
  

  

  513 
  

  

  191 
  

  

  11 
  

  

  100 
  

  

  175 
  

  

  216 
  

  

  45 
  

  

  64 
  

  

  51 
  

  

  275 
  

  

  444 
  

  

  924 
  

  

  1015 
  

  

  477 
  

  

  1 
  

  

  21 
  

  

  115 
  

  

  6 
  

  

  219 
  

  

  132 
  

  

  6 
  

  

  4488 
  

  

  Occurrences 
  of 
  

  

  Genera. 
  

  

  79 
  

   7 
  

  

  55 
  

  

  70 
  

  

  127 
  

  

  19 
  

  

  41 
  

  

  38 
  

  

  89 
  

  

  161 
  

  

  376 
  

  

  271 
  

  

  13 
  

  

  3 
  

  

  8 
  

  

  10 
  

  

  6 
  

  

  94 
  

  

  60 
  

  

  1531 
  

  

  Species. 
  

  

  191 
  

  

  12 
  

  

  182 
  

  

  189 
  

  

  250 
  

  

  59 
  

  

  75 
  

  

  66 
  

  

  370 
  

  

  659 
  

  

  1235 
  

  

  1121 
  

  

  514 
  

  

  3 
  

  

  26 
  

  

  132 
  

  

  7 
  

  

  218 
  

  

  144 
  

  

  6 
  

  

  5459 
  

  

  