﻿32 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY, 
  [Now 
  18, 
  

  

  a 
  long, 
  narrow, 
  and 
  deep 
  fossula, 
  is 
  shallow, 
  and 
  presents 
  a 
  wavy- 
  

   margin 
  on 
  an 
  even 
  plane. 
  Septa 
  very 
  numerous, 
  crowded, 
  often 
  

   curved, 
  but 
  generally 
  straight, 
  a 
  little 
  thicker 
  at 
  the 
  wall 
  than 
  else- 
  

   where, 
  rounded 
  externally 
  and 
  not 
  bilobed, 
  marked 
  by 
  a 
  slight 
  un- 
  

   even 
  serration 
  on 
  the 
  upper 
  edge 
  and 
  by 
  small 
  papilla?. 
  The 
  lamellae 
  

   are 
  granular. 
  There 
  are 
  six 
  systems 
  of 
  five 
  cycles, 
  and 
  several 
  

   orders 
  of 
  the 
  sixth. 
  There 
  is 
  a 
  long 
  columella 
  and 
  a 
  deep 
  fossula. 
  

   The 
  endotheca 
  is 
  abundant, 
  and 
  the 
  wall 
  is 
  well 
  developed. 
  Costae 
  large 
  

   above, 
  projecting 
  outwards 
  at 
  the 
  calicular 
  margin 
  from 
  y 
  1 
  ^ 
  to 
  T 
  2 
  7 
  

   inch 
  ; 
  edges 
  rounded 
  and 
  completely 
  occupied 
  by 
  transverse 
  ridges 
  

   or 
  rows 
  of 
  tubercles, 
  and 
  at 
  the 
  upper 
  extremities 
  traversed 
  by 
  an 
  

   extension 
  of 
  the 
  series 
  of 
  papillae, 
  which 
  range 
  along 
  the 
  middle 
  of 
  

   their 
  lamellae. 
  Exotheca 
  occasionally 
  crossing 
  the 
  costal 
  edges 
  ; 
  its 
  

   dissepiments 
  are 
  inclined, 
  and 
  form 
  cells. 
  Epitheca 
  well 
  developed 
  

   and 
  membraniform. 
  Height 
  of 
  Coral 
  2± 
  inches 
  ; 
  breadth 
  2 
  inches 
  ; 
  

   length 
  2j^- 
  inches 
  ; 
  length 
  of 
  calico 
  2 
  J 
  inches. 
  

  

  From 
  the 
  Nivaje 
  shale, 
  San 
  Domingo. 
  Coll. 
  Geol. 
  Soc. 
  and 
  Brit. 
  

   Mus. 
  

  

  The 
  genus 
  is 
  represented 
  in 
  the 
  Tertiaries 
  of 
  Southern 
  India 
  and 
  

   Seinde. 
  

  

  The 
  three 
  specimens 
  next 
  to 
  be 
  described 
  are 
  from 
  the 
  Nivaje 
  

   shale. 
  One 
  has 
  been 
  the 
  subject 
  of 
  an 
  elaborate 
  essay 
  by 
  Mr. 
  

   Lonsdale 
  (see 
  MS. 
  on 
  San 
  Domingan 
  Corals, 
  Libr. 
  Geol. 
  Soc), 
  and 
  

   the 
  others 
  were 
  examined 
  by 
  me 
  before 
  the 
  reception 
  of 
  his 
  valuable 
  

   memoir. 
  Mr. 
  Lonsdale 
  had 
  but 
  one 
  specimen, 
  and 
  the 
  points 
  which 
  

   caused 
  him 
  great 
  trouble 
  were 
  fortunately 
  easily 
  determined 
  by 
  

   the 
  examination 
  of 
  a 
  second, 
  which 
  was 
  all 
  the 
  time 
  in 
  the 
  Col- 
  

   lection 
  at 
  Somerset 
  House. 
  On 
  the 
  other 
  hand, 
  certain 
  portions 
  of 
  

   the 
  fine 
  Coral 
  described 
  by 
  Mr. 
  Lonsdale 
  afforded 
  explanations 
  con- 
  

   cerning 
  the 
  structure 
  of 
  a 
  part 
  of 
  the 
  specimen 
  I 
  had 
  noticed. 
  The 
  

   determination 
  of 
  the 
  position 
  of 
  the 
  genus 
  and 
  even 
  of 
  the 
  subfamily 
  

   of 
  the 
  Coral 
  in 
  the 
  classification 
  of 
  Edwards 
  and 
  Haime 
  is 
  difficult, 
  

   and 
  Mr. 
  Lonsdale, 
  with 
  a 
  view 
  to 
  prevent 
  the 
  rapidly 
  increasing 
  com- 
  

   plexity 
  of 
  this 
  classification, 
  decided 
  to 
  link 
  the 
  form 
  provisionally 
  

   with 
  the 
  Eusmilince, 
  under 
  the 
  genus 
  Rhipidogyra. 
  Had 
  the 
  speci- 
  

   men 
  I 
  have 
  studied 
  been 
  before 
  Mr. 
  Lonsdale, 
  he 
  would 
  have 
  rejected 
  

   the 
  subfamily 
  under 
  which 
  he 
  was 
  justified 
  in 
  arranging 
  his 
  fossil. 
  

  

  According 
  to 
  Dana 
  and 
  Edwards 
  and 
  Haime, 
  the 
  Corals 
  of 
  the 
  

   great 
  family 
  Astrceidce 
  consist 
  of 
  forms 
  whose 
  septal 
  margins 
  are 
  per- 
  

   fect, 
  smooth, 
  and 
  entire 
  (Eusmilince), 
  or 
  whose 
  septal 
  margins 
  are 
  armed 
  

   with 
  teeth 
  or 
  spines 
  (Astrc&ince). 
  In 
  theory, 
  and 
  in 
  the 
  case 
  of 
  

   recent 
  Corals, 
  this 
  division 
  affords 
  great 
  facilities 
  ; 
  but 
  in 
  rolled 
  and 
  

   fossil 
  Corals 
  it 
  is 
  constantly 
  at 
  fault, 
  and 
  where 
  there 
  are 
  so 
  many 
  

   grades 
  between 
  a 
  spine 
  and 
  a 
  smooth 
  surface, 
  such 
  as 
  granules 
  and 
  

   papillae, 
  it 
  is 
  of 
  little 
  practical 
  worth. 
  Thus 
  the 
  important 
  genus 
  

   Montlivaltia 
  was 
  classified 
  by 
  Edwards 
  and 
  Haime 
  amongst 
  the 
  

   Eusmilince, 
  but 
  now 
  it 
  is 
  found 
  amongst 
  the 
  Astrceince 
  ; 
  and 
  these 
  

   authors, 
  whose 
  philosophic 
  exertions 
  to 
  facilitate 
  the 
  study 
  of 
  Zoo- 
  

   phytes 
  cannot 
  be 
  sufficiently 
  acknowledged, 
  have 
  cast 
  a 
  doubt 
  

  

  