﻿

  E. 
  F. 
  TOMES 
  ON 
  LOWEE-OOLITE 
  MADEEPOEAEIA. 
  419 
  

  

  inwards 
  and 
  being 
  two 
  thirds 
  of 
  the 
  length 
  of 
  those 
  of 
  the 
  first 
  

   cycle. 
  The 
  fossula, 
  not 
  visible 
  in 
  the 
  type 
  specimen, 
  is 
  in 
  this 
  

   one 
  small, 
  ronnd, 
  and 
  well 
  defined. 
  The 
  only 
  real 
  difference 
  

   between 
  this 
  specimen 
  and 
  the 
  one 
  figured 
  by 
  Edwards 
  and 
  Haime 
  

   lies 
  in 
  the 
  thickness 
  of 
  the 
  septa 
  generally, 
  those 
  of 
  my 
  specimen 
  

   being 
  thinner 
  than 
  those 
  in 
  the 
  original 
  one. 
  

  

  Montlivaltia 
  Pajnswicki, 
  Dune. 
  Supp. 
  Brit. 
  Eoss. 
  Cor. 
  pt. 
  iii. 
  p. 
  17, 
  

   pi. 
  i. 
  fig. 
  12 
  (1872) 
  ; 
  Tomes, 
  Geol. 
  Mag. 
  dec. 
  ii. 
  vol. 
  v. 
  1878. 
  

  

  The 
  use 
  of 
  Prof. 
  Duncan's 
  type 
  specimen 
  of 
  this 
  species, 
  kindly 
  

   supplied 
  by 
  Dr. 
  Holl, 
  has 
  enabled 
  me 
  to 
  confirm 
  my 
  decision 
  respect- 
  

   ing 
  the 
  coral 
  I 
  referred 
  to 
  this 
  species 
  which 
  I 
  obtained 
  from 
  

   Crickley. 
  It 
  appears 
  to 
  be 
  a 
  well-marked 
  species, 
  and 
  occurs 
  in 
  the 
  

   lower 
  reef 
  at 
  Crickley 
  and 
  in 
  the 
  middle 
  reef 
  at 
  Painswick. 
  

  

  Montlivaltia 
  teochoides, 
  Edw. 
  and 
  Haime, 
  Ann. 
  des 
  Sci. 
  lS 
  T 
  at. 
  

   ser. 
  3, 
  vol. 
  x. 
  p. 
  229 
  (1848) 
  ; 
  Brit. 
  Eoss. 
  Cor. 
  pt. 
  ii. 
  p. 
  129, 
  

   pi. 
  xxvii. 
  figs. 
  2-4 
  (1851). 
  

  

  All 
  the 
  specimens 
  of 
  this 
  species 
  which 
  I 
  have 
  seen 
  from 
  the 
  

   Inferior 
  Oolite 
  of 
  Gloucestershire 
  have 
  been 
  of 
  small 
  size, 
  and 
  very 
  

   often 
  showed 
  evidence 
  of 
  a 
  dwarfed 
  growth. 
  

  

  MONTLIVALTIA 
  POEPITA, 
  n. 
  Sp. 
  

  

  The 
  corallum 
  is 
  turbinate, 
  short, 
  and 
  attached 
  by 
  a 
  small 
  base. 
  

  

  The 
  epitheca 
  is 
  thin, 
  smooth, 
  and 
  rudimentary, 
  and 
  does 
  not 
  

   extend 
  quite 
  to 
  the 
  margin 
  of 
  the 
  calice. 
  

  

  The 
  calice 
  is 
  a 
  very 
  little 
  elongated, 
  and 
  the 
  fossula 
  is 
  wide 
  and 
  

   has 
  a 
  small 
  and 
  slightly 
  elongated 
  centre. 
  

  

  The 
  septa 
  are 
  numerous, 
  thickly 
  set, 
  and 
  somewhat 
  exsert. 
  Their 
  

   sides 
  are 
  ornamented 
  with 
  vertical 
  ridges 
  which 
  are 
  very 
  strongly 
  

   marked 
  and 
  terminate 
  in 
  large 
  but 
  very 
  irregular 
  tubercles. 
  

  

  There 
  are 
  five 
  complete 
  cycles 
  of 
  septa 
  and 
  part 
  of 
  a 
  sixth. 
  

   Those 
  of 
  the 
  first 
  and 
  second 
  meet 
  and 
  blend, 
  but 
  clo 
  not 
  form 
  a 
  

   false 
  columella. 
  They 
  are 
  very 
  thin 
  outwardly, 
  but 
  increase 
  in 
  size 
  

   regularly 
  as 
  they 
  approach 
  the 
  centre. 
  Those 
  of 
  the 
  third 
  cycle 
  are 
  

   about 
  two 
  thirds 
  the 
  length 
  of 
  the 
  first 
  and 
  second, 
  and 
  the 
  others 
  

   decrease 
  in 
  length 
  according 
  to 
  their 
  order. 
  

  

  It 
  is 
  only 
  the 
  longer 
  septa 
  which 
  increase 
  in 
  thickness 
  inwardly, 
  

   but 
  all 
  have 
  rough 
  tubercles 
  which 
  are 
  sometimes 
  fused 
  together. 
  

   There 
  are 
  about 
  twenty 
  of 
  these 
  on 
  the 
  longer 
  septa. 
  

  

  Height 
  of 
  the 
  corallum 
  5 
  lines. 
  

  

  Diameter 
  of 
  the 
  calice 
  7 
  lines. 
  

  

  This 
  species 
  may 
  be 
  very 
  readily 
  distinguished 
  by 
  its 
  peculiar 
  

   septa, 
  which 
  thicken 
  inwardly, 
  and 
  have 
  very 
  large 
  and 
  ill-defined 
  

   tubercles. 
  It 
  bears 
  a 
  slight 
  resemblance 
  in 
  this 
  respect 
  to 
  a 
  small 
  

   species 
  from 
  the 
  Upper 
  Lias 
  of 
  Oxfordshire, 
  which 
  I 
  have 
  described 
  

   under 
  the 
  name 
  of 
  M 
  . 
  tuberculata*. 
  

  

  It 
  occurs 
  in 
  the 
  Trigonia-grit 
  at 
  Leckhampton 
  Hill, 
  and 
  at 
  

  

  * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxiv. 
  p. 
  179, 
  pi. 
  ix. 
  fig. 
  7 
  (1878). 
  

  

  