﻿K. 
  F. 
  TOMES 
  OST 
  LOWER-OOLITE 
  MADREPORARIA. 
  439 
  

  

  surface 
  1 
  inch. 
  6 
  lines 
  ; 
  shortest 
  diameter 
  of 
  the 
  calicular 
  surface 
  5 
  

   lines. 
  

  

  In 
  a 
  second 
  and 
  very 
  much 
  worn 
  example 
  the 
  upright 
  lobes, 
  

   instead 
  of 
  being 
  ranged 
  in 
  a 
  line, 
  are 
  placed 
  in 
  a 
  triangle. 
  The 
  

   third 
  is 
  regularly 
  turbinate, 
  tall, 
  has 
  a 
  very 
  oblique 
  calicular 
  surface, 
  

   and 
  is 
  wholly 
  destitute 
  of 
  wall 
  or 
  epitheca. 
  

  

  All 
  these 
  were 
  taken 
  from 
  the 
  lower 
  reef 
  at 
  Crickley 
  Hill. 
  

  

  THAMFASTRiEA 
  ftt^giformis, 
  Edw. 
  & 
  Haime, 
  Brit. 
  Eoss. 
  Cor. 
  pt 
  ii. 
  

   p. 
  141, 
  pi. 
  xxx. 
  fig. 
  3 
  (1851). 
  

  

  One 
  specimen 
  only 
  has 
  has 
  come 
  to 
  my 
  knowledge. 
  It 
  was 
  ob- 
  

   tained 
  from 
  the 
  Trigonia-giit 
  of 
  Brown's 
  Hill, 
  near 
  Seven 
  Springs. 
  

   It 
  agrees 
  with 
  great 
  exactness 
  with 
  the 
  figure 
  and 
  description 
  

   given 
  by 
  the 
  original 
  describers. 
  

  

  Tham^astr^a 
  mettensis, 
  Edw. 
  and 
  Haime, 
  Brit. 
  Eoss. 
  Cor. 
  pt. 
  ii. 
  

   p. 
  141, 
  pi. 
  xxx. 
  fig. 
  3 
  (1851). 
  

  

  Hitherto 
  I 
  have 
  only 
  met 
  with 
  this 
  species 
  in 
  the 
  lower 
  reef 
  at 
  

   Crickley, 
  and 
  in 
  the 
  Trigonia-grit 
  at 
  Eavensgate 
  and 
  Leckhampton 
  

   Hill. 
  

  

  Thamnastrjea 
  Defrancxana, 
  Edw. 
  and 
  Haime, 
  Pol. 
  Terr. 
  Paleoz. 
  

   p. 
  110 
  (1851). 
  

   Astrcea 
  Defranciana, 
  Mich. 
  Zooph. 
  p. 
  9, 
  pi. 
  ii. 
  fig. 
  1 
  (1840). 
  

  

  All 
  the 
  specimens 
  I 
  have 
  met 
  with 
  (and 
  they 
  are 
  not 
  numerous) 
  

   were 
  obtained 
  from 
  the 
  lower 
  reef 
  at 
  Crickley 
  Hill. 
  

  

  Thamnastr^sa 
  Terquemi, 
  Edw. 
  and 
  Haime, 
  Brit. 
  Eoss. 
  Cor. 
  pt. 
  ii 
  

   p. 
  140, 
  pi. 
  xxx. 
  fig. 
  2 
  (1851). 
  

  

  Yery 
  few 
  of 
  the 
  examples 
  of 
  this 
  species 
  have 
  the 
  regular 
  tur- 
  

   binate 
  form 
  of 
  the 
  specimen 
  figured 
  by 
  the 
  original 
  describers, 
  the 
  

   greater 
  number 
  being 
  extremely 
  irregular 
  and 
  having 
  a 
  very 
  rugged 
  

   method 
  of 
  growth. 
  

  

  They 
  are 
  commonly 
  attached 
  by 
  a 
  small 
  surface 
  of 
  no 
  definite 
  

   form, 
  from 
  which 
  they 
  ascend 
  and 
  expand 
  in 
  joints 
  rather 
  than 
  

   layers, 
  which 
  overlap 
  on 
  one 
  side, 
  but 
  do 
  not 
  cover 
  the 
  previous 
  

   growth 
  on 
  the 
  other. 
  The 
  growth 
  makes 
  some 
  of 
  them 
  very 
  much 
  

   like 
  a 
  pile 
  of 
  coins 
  which 
  have 
  been 
  pushed 
  a 
  good 
  deal 
  on 
  one 
  

   side. 
  

  

  The 
  calicular 
  surface 
  often 
  presents 
  the 
  figure 
  of 
  a 
  rude 
  triangle 
  

   or 
  lozenge, 
  though 
  sometimes 
  it 
  is 
  oblong 
  or 
  crescent-shaped. 
  

  

  It 
  is 
  a 
  common 
  species 
  in 
  the 
  lower 
  reef 
  at 
  Crickley 
  Hill 
  ; 
  but 
  the 
  

   most 
  rugose 
  specimens 
  have 
  been 
  obtained 
  from 
  the 
  same 
  zone 
  near 
  

   Cooper's 
  Hill, 
  where 
  it 
  appears 
  to 
  be 
  equally 
  abundant. 
  

  

  Thamnastr^a 
  Walcoti, 
  Duncan, 
  Supp. 
  Brit. 
  Foss. 
  Cor. 
  pt. 
  iii. 
  p 
  19 
  

   pi. 
  iv. 
  figs. 
  5-10 
  (1872). 
  

  

  At 
  present 
  this 
  species 
  has 
  only 
  appeared 
  in 
  the 
  lower 
  reef. 
  

   Specimens 
  from 
  the 
  neighbourhood 
  of 
  Cheltenham 
  differ 
  from 
  the 
  

   figures 
  and 
  description 
  given 
  by 
  Prof. 
  Duncan, 
  only 
  in 
  having 
  the 
  

  

  