﻿28 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Nov. 
  18, 
  

  

  the 
  laminae, 
  are 
  granular; 
  they 
  are 
  visible 
  to 
  the 
  base, 
  but 
  are 
  

   smaller 
  and 
  less 
  spinous 
  there 
  ; 
  two 
  large 
  costae 
  have 
  a 
  smaller 
  rib 
  

   between 
  them, 
  and 
  it, 
  in 
  its 
  turn, 
  has 
  a 
  smaller 
  one 
  on 
  either 
  side. 
  

   Calice 
  oval- 
  elliptical 
  and 
  deep. 
  Septa 
  numerous, 
  crowded, 
  the 
  largest 
  

   exsert 
  and 
  rounded 
  at 
  the 
  wall, 
  passing 
  soon 
  downwards 
  and 
  then 
  

   inwards, 
  ending 
  in 
  an 
  angle 
  over 
  the 
  inner 
  vertical 
  edge 
  ; 
  they 
  are 
  

   lacerated 
  above, 
  are 
  thickest 
  at 
  the 
  wall, 
  and 
  granular 
  ; 
  six 
  systems 
  

   of 
  five 
  cycles, 
  and 
  a 
  few 
  orders 
  in 
  one 
  system 
  of 
  a 
  sixth 
  cycle. 
  

  

  The 
  septa 
  of 
  the 
  first 
  three 
  cycles 
  are 
  subequal, 
  and 
  the 
  others 
  are 
  

   much 
  smaller. 
  Endotheca 
  well 
  developed, 
  and 
  between 
  the 
  costae 
  

   there 
  are 
  traces 
  of 
  exotheca. 
  Height 
  3 
  inches 
  ; 
  length 
  of 
  calice 
  2^ 
  

   inches 
  ; 
  breadth 
  1^ 
  inch 
  ; 
  depth 
  of 
  fossa 
  T 
  \ 
  inch 
  ; 
  length 
  of 
  largest 
  

   costal 
  spine 
  -J- 
  inch. 
  

   From 
  the 
  tufaceous 
  Sandstone, 
  San 
  Domingo. 
  Coll. 
  Gcol. 
  Soc* 
  

   This 
  species 
  is 
  closely 
  allied 
  to 
  the 
  Caryophyllia 
  lacera, 
  Edwards 
  

   & 
  Haime, 
  existing 
  in 
  the 
  American 
  seas, 
  and 
  has 
  but 
  little 
  resem- 
  

   blance 
  to 
  the 
  Southern 
  Pacific 
  species. 
  

  

  In 
  the 
  first 
  part 
  of 
  this 
  communication 
  (Quart. 
  Journ. 
  Geol. 
  Soc. 
  

   vol. 
  xix. 
  p. 
  442) 
  it 
  was 
  stated 
  that 
  probably 
  a 
  new 
  genus 
  would 
  have 
  

   to 
  be 
  formed 
  to 
  admit 
  certain 
  simple 
  Corals 
  allied 
  to 
  Montlivaltia 
  

   and 
  Circophyllia, 
  and 
  the 
  specimens 
  now 
  under 
  consideration 
  render 
  

   it 
  imperative. 
  The 
  comparative 
  diagnosis 
  of 
  the 
  three 
  genera 
  is 
  as 
  

   follows 
  : 
  — 
  

  

  Montlivaltia. 
  Epitheca 
  membraniform, 
  well 
  developed. 
  Columella 
  

  

  none, 
  or 
  formed 
  by 
  septal 
  spines. 
  Septa 
  with 
  close 
  and 
  irregular 
  

  

  teeth. 
  

   CircopTiyllia. 
  Epitheca 
  none, 
  or 
  rudimentary. 
  Columella 
  large 
  

  

  and 
  papillary. 
  Septa 
  in 
  rounded 
  lobes. 
  

   Antillia 
  (gen. 
  nov.). 
  Epitheca 
  membraniform, 
  well 
  developed. 
  

  

  Columella 
  well 
  developed, 
  essential. 
  Septa 
  both 
  in 
  rounded 
  

  

  lobes 
  and 
  as 
  in 
  Montlivaltia. 
  

  

  Antillia, 
  gen. 
  nov. 
  

  

  Montlivaltia 
  (pars), 
  Edwards 
  & 
  Haime. 
  

   CircopTiyllia 
  (pars), 
  Edwards 
  & 
  Haime. 
  

  

  Coral 
  simple, 
  with 
  more 
  or 
  less 
  dentate 
  septa, 
  a 
  columella, 
  an 
  

   epitheca, 
  and 
  both 
  an 
  endotheca 
  and 
  exotheca. 
  Costae 
  variously 
  

   granulated, 
  tuberculated, 
  spined 
  or 
  crested. 
  

  

  13. 
  Antillia 
  ponderosa, 
  Edwards 
  & 
  Haime, 
  sp. 
  PI. 
  V. 
  fig. 
  5. 
  

  

  Montlivaltia 
  ponderosa, 
  Edwards 
  & 
  Haime. 
  

   CircopTiyllia, 
  species 
  1 
  ?, 
  Lonsdale 
  MS. 
  

  

  A 
  small 
  specimen 
  of 
  this 
  Coral 
  is 
  amongst 
  the 
  Heneken 
  Collection 
  ; 
  

   it 
  is 
  a 
  young 
  individual, 
  having 
  a 
  well-marked 
  columella 
  and 
  a 
  dense 
  

   membraniform 
  epitheca 
  marked 
  with 
  transverse 
  ridges. 
  It 
  is 
  limpet- 
  

   shaped, 
  slightly 
  compressed, 
  and 
  has 
  a 
  shallow 
  fossa. 
  There 
  are 
  six 
  

  

  * 
  Mr. 
  Lonsdale's 
  MS. 
  contains 
  an 
  elaborate 
  description 
  of 
  this 
  Coral. 
  

  

  