﻿440 
  E. 
  E. 
  TOMES 
  01* 
  LOWEE-OOLITE 
  MADEEPOEAEIA. 
  

  

  corallum 
  more 
  thin 
  and 
  expanding 
  and 
  with 
  a 
  mnch 
  more 
  irregular 
  

   outline. 
  

  

  I 
  am 
  indebted 
  to 
  my 
  friend 
  the 
  Rev. 
  P. 
  B. 
  Brodie 
  for 
  a 
  very 
  

   characteristic 
  example 
  of 
  this 
  coral, 
  which 
  he 
  took 
  from 
  the 
  coralli- 
  

   ferous 
  deposits 
  at 
  the 
  Horse-Pools 
  Hill, 
  near 
  Gloucester. 
  The 
  coral- 
  

   bank 
  there 
  exposed 
  is 
  the 
  equivalent 
  of 
  the 
  one 
  at 
  Crickley 
  Hill. 
  

  

  Genus 
  Oeoseeis, 
  Edw. 
  and 
  Haime. 
  

  

  This 
  genus 
  was 
  associated 
  by 
  its 
  original 
  describers 
  with 
  the 
  

   genus 
  Comoseris, 
  to 
  which 
  it 
  really 
  bears 
  but 
  a 
  faint 
  resemblance. 
  

   As 
  at 
  present 
  understood, 
  it 
  is 
  a 
  close 
  ally 
  of 
  Thamnastrcea 
  ; 
  and 
  

   some 
  of 
  the 
  species 
  are 
  not 
  easily 
  distinguished 
  from 
  it 
  ; 
  for 
  the 
  

   arrangement 
  of 
  the 
  calices 
  in 
  lines, 
  which 
  may 
  have 
  either 
  a 
  radial 
  

   direction 
  or 
  a 
  concentric 
  one, 
  is 
  often 
  varied 
  by 
  the 
  calices 
  being 
  

   evenly 
  distributed, 
  as 
  in 
  Thamnastrcea. 
  

  

  The 
  difference 
  existing 
  between 
  those 
  species 
  in 
  which 
  the 
  rows 
  

   of 
  calices 
  assume 
  a 
  more 
  or 
  less 
  radial 
  course, 
  and 
  those 
  in 
  which 
  

   they 
  are 
  disposed 
  concentrically, 
  is 
  probably 
  of 
  more 
  importance 
  

   than 
  at 
  first 
  sight 
  appears. 
  In 
  those 
  having 
  the 
  first 
  arrangement, 
  

   gemmation 
  must 
  have 
  taken 
  place 
  more 
  or 
  less 
  in 
  connexion 
  with 
  

   the 
  existing 
  calices 
  : 
  but 
  in 
  the 
  second 
  a 
  complete 
  ring 
  of 
  septal 
  

   costa> 
  had 
  been 
  produced, 
  bounding 
  the 
  upper 
  surface 
  of 
  the 
  

   corallum, 
  and 
  from 
  these 
  the 
  new 
  calices 
  were 
  produced. 
  

  

  Oeoseeis 
  oolitica, 
  n. 
  sp. 
  

  

  The 
  corallum 
  is 
  large, 
  and 
  very 
  irregular 
  in 
  form. 
  It 
  is 
  depressed, 
  

   with 
  the 
  upper 
  surface 
  more 
  or 
  less 
  gibbous 
  and 
  the 
  under 
  parts 
  

   very 
  irregular. 
  The 
  outer 
  margin 
  is 
  thin, 
  and 
  a 
  little 
  wavy. 
  

  

  The 
  basal 
  wall 
  is 
  covered 
  by 
  a 
  very 
  strongly 
  marked 
  and 
  wrinkled 
  

   epitheca, 
  which 
  has 
  deep 
  concentric 
  folds. 
  

  

  The 
  mural 
  costae, 
  when 
  exposed 
  by 
  the 
  abrasion 
  of 
  the 
  epitheca, 
  

   are 
  numerous, 
  delicate, 
  and 
  have 
  many 
  cuneiform 
  synapticulge. 
  

  

  The 
  calices 
  are 
  for 
  the 
  most 
  part 
  placed 
  in 
  distinct 
  linear 
  grooves, 
  

   though 
  on 
  some 
  parts 
  of 
  the 
  corallum 
  they 
  are 
  scattered 
  much 
  as 
  in 
  

   Uiamnastrcea. 
  In 
  direction, 
  the 
  grooves 
  irregularly 
  follow 
  the 
  

   lines 
  of 
  the 
  outer 
  margin 
  of 
  the 
  corallum. 
  The 
  longest 
  furrow 
  

   contains 
  eight 
  calices 
  ; 
  but 
  more 
  commonly 
  four 
  or 
  five 
  are 
  observ- 
  

   able 
  in 
  a 
  series. 
  The 
  ridges 
  between 
  the 
  calices 
  are 
  not 
  very 
  pro- 
  

   minent, 
  but 
  are 
  obtusely 
  rounded 
  ; 
  and 
  the 
  septal 
  costse 
  pass 
  over 
  

   them 
  without 
  any 
  interruption 
  or 
  deflexion 
  from 
  their 
  line. 
  The 
  

   furrows 
  are 
  about 
  two 
  lines 
  wide. 
  

  

  The 
  calices 
  are 
  from 
  one 
  line 
  to 
  one 
  line 
  and 
  a 
  half 
  apart 
  in 
  the 
  

   furrows, 
  and 
  they 
  vary 
  somewhat 
  in 
  their 
  depth. 
  The 
  septa 
  and 
  

   septal 
  costse 
  are 
  rather 
  crowded, 
  irregular 
  in 
  thickness, 
  and 
  alter- 
  

   nately 
  more 
  or 
  less 
  prominent 
  ; 
  and 
  this 
  gives 
  them 
  the 
  appearance 
  

   of 
  being 
  alternately 
  large 
  and 
  small 
  ; 
  but 
  where 
  much 
  rubbed 
  down, 
  

   they 
  appear 
  to 
  be 
  of 
  nearly 
  equal 
  size. 
  All 
  have 
  their 
  margins 
  

   distinctly 
  but 
  rudely 
  tuberculated. 
  

  

  The 
  only 
  specimens 
  I 
  have 
  met 
  with 
  were 
  associated 
  with 
  

   Belemnites, 
  in 
  the 
  compact 
  yellow 
  stone, 
  about 
  twenty 
  feet 
  below 
  

  

  