﻿4i4 
  

  

  E. 
  F. 
  TOMES 
  OjS 
  t 
  LOWEE-OOLITE 
  MADEEPOEAEIA. 
  

  

  Oroseris 
  concentrica 
  . 
  . 
  

  

  contorta 
  

  

  incrustans 
  

  

  gibbosa 
  

  

  Dimorpharasa 
  Lycetti 
  .. 
  

  

  pecluuculata 
  

  

  Fromenteli 
  

  

  > 
  S 
  P 
  

  

  Pkylloseris 
  rugosa 
  

  

  >sp 
  

  

  Comoseris 
  vermicularis 
  

  

  16 
  

  

  38 
  

  

  10 
  

  

  A 
  glance 
  at 
  the 
  foregoing 
  Table 
  will 
  at 
  once 
  show, 
  from 
  the 
  small 
  

   number 
  of 
  species 
  which 
  are 
  common 
  to 
  the 
  three 
  coralliferous 
  beds, 
  

   that 
  their 
  connexion 
  with 
  each 
  other 
  is 
  not 
  very 
  intimate. 
  There 
  

   is,, 
  however, 
  a 
  certain 
  relationship 
  between 
  the 
  lower 
  and 
  middle 
  

   ones, 
  as 
  many 
  as 
  six 
  species 
  out 
  of 
  forty-eight 
  being 
  common 
  to 
  

   both. 
  

  

  Into 
  the 
  upper 
  coral-bed, 
  however, 
  two 
  species 
  only 
  from 
  the 
  

   lower 
  bed 
  pass 
  ; 
  and 
  the 
  importance 
  of 
  one 
  of 
  them 
  is 
  much 
  lessened 
  

   by 
  the 
  fact 
  that 
  it 
  has 
  a 
  much 
  more 
  extended 
  range 
  in 
  time, 
  and 
  is 
  

   common 
  in 
  the 
  Great 
  as 
  well 
  as 
  in 
  the 
  Inferior 
  Oolite. 
  It 
  is 
  

   Anabacia 
  complanata. 
  The 
  other 
  one, 
  Thamnastrcea 
  mettensis, 
  

   is 
  much 
  more 
  abundant 
  in 
  the 
  upper 
  than 
  in 
  the 
  lower 
  coral-bed, 
  

   as 
  well 
  as 
  being 
  of 
  much 
  more 
  vigorous 
  growth 
  ; 
  it 
  has 
  not 
  yet 
  

   been 
  met 
  with 
  in 
  the 
  middle 
  reef 
  to 
  the 
  best 
  of 
  my 
  knowledge. 
  

  

  The 
  species 
  here 
  given, 
  their 
  distribution 
  in 
  time, 
  and 
  the 
  growth 
  

   and 
  development 
  of 
  the 
  individuals 
  will 
  at 
  once 
  show 
  that 
  the 
  con- 
  

   ditions 
  favourable 
  to 
  the 
  production 
  of 
  simple 
  species 
  were 
  wanting, 
  

   not 
  only 
  in 
  the 
  lowest 
  beds, 
  which 
  are 
  only 
  a 
  little 
  above 
  the 
  U-pper 
  

   Lias, 
  but 
  also 
  in 
  the 
  overlying 
  lower 
  reef 
  : 
  for 
  while 
  such 
  species 
  as 
  

   Jsastrcea 
  serialis 
  and 
  Oroseris 
  oolitica 
  had 
  a 
  vigorous 
  growth 
  and 
  

   attained 
  to 
  a 
  considerable 
  size, 
  the 
  Montlivaltice 
  were 
  dwarfed 
  and 
  

   distorted 
  in 
  form. 
  The 
  same 
  observation 
  will 
  apply 
  in 
  a 
  great 
  

   degree 
  to 
  the 
  species 
  in 
  the 
  lower 
  reef. 
  The 
  simple 
  corals 
  found 
  in 
  

   it 
  are 
  mostly 
  small 
  and 
  irregular 
  in 
  growth, 
  while 
  the 
  compound 
  

   ones 
  are 
  well 
  formed 
  and 
  vigorous. 
  In 
  a 
  word, 
  the 
  reef-builders 
  

   throve, 
  while 
  those 
  which 
  were 
  not 
  reef 
  species 
  exhibit 
  great 
  poverty 
  

   of 
  development. 
  

  

  Only 
  two 
  simple 
  corals 
  occur 
  in 
  the 
  middle 
  coral-bed, 
  and 
  they 
  

   are 
  continued 
  into 
  it 
  from 
  the 
  lower 
  one. 
  They 
  are 
  the 
  Monilivaltia 
  

   PainswicJci 
  of 
  Prof. 
  Duncan 
  and 
  Anabacia 
  complanata. 
  

  

  In 
  the 
  upper 
  coral-bed, 
  however, 
  are 
  several 
  Montlivaltim, 
  and 
  

   they 
  are 
  of 
  more 
  regular 
  and 
  less 
  interrupted 
  growth, 
  as 
  well 
  as 
  of 
  

   larger 
  size, 
  than 
  those 
  of 
  the 
  inferior 
  deposits. 
  They 
  less 
  strictly 
  

   resemble 
  the 
  species 
  of 
  a 
  true 
  reef 
  than 
  those 
  before 
  mentioned. 
  

  

  