﻿40 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [NOV. 
  18, 
  

  

  26. 
  Solenastr^a 
  Verhelsti 
  (Milne-Edwards 
  & 
  Jules 
  Hairue, 
  Hist. 
  

   Nat. 
  des 
  Corall. 
  p. 
  496), 
  variety. 
  

  

  Corallum 
  massive, 
  short, 
  flat, 
  with 
  a 
  plane 
  surface. 
  Calices 
  cir- 
  

   cular, 
  close, 
  almost 
  equal 
  in 
  size. 
  Wall 
  very 
  thin. 
  Septa 
  in 
  three 
  

   cycles 
  and 
  unequal 
  in 
  size 
  ; 
  the 
  primary 
  are 
  the 
  largest, 
  and 
  the 
  secon- 
  

   dary, 
  which 
  are 
  a 
  little 
  smaller, 
  extend 
  to 
  the 
  rudimentary 
  columella, 
  

   whilst 
  the 
  tertiary 
  are 
  small 
  and 
  reach 
  but 
  a 
  little 
  way 
  inwards. 
  

   All 
  are 
  sharply 
  granular 
  or 
  subspinous 
  laterally, 
  and 
  the 
  free 
  inner 
  

   edges 
  of 
  the 
  third 
  order 
  are 
  bluntly 
  but 
  regularly 
  dentate. 
  Costa? 
  

   rudimentary, 
  attached 
  to 
  each 
  septum, 
  rounded 
  and 
  blunt. 
  Exo- 
  

   thecal 
  cells 
  large, 
  and 
  about 
  -fa 
  inch 
  in 
  longitudinal 
  measurement. 
  

   Endothecal 
  dissepiments 
  delicate, 
  a 
  little 
  inclined, 
  with 
  the 
  spaces 
  

   between 
  them 
  smaller 
  than 
  the 
  exothecal 
  cells. 
  Diameter 
  of 
  coral 
  - 
  

   lites 
  in 
  transverse 
  section 
  -^ 
  inch 
  ; 
  height 
  2 
  to 
  2\ 
  inches. 
  

  

  Prom 
  the 
  tufaceous 
  limestone, 
  San 
  Domingo. 
  Coll. 
  Geol. 
  Soc. 
  

  

  The 
  identity 
  of 
  this 
  form 
  with 
  the 
  JSolenastrcea 
  Verhelsti, 
  Edwards 
  

   & 
  Haime, 
  of 
  the 
  Eocene 
  of 
  Ghent, 
  is 
  very 
  remarkable 
  ; 
  for 
  fragility 
  

   and 
  increased 
  delicacy 
  of 
  septa 
  cannot 
  be 
  admitted 
  as 
  evidences 
  of 
  

   anything 
  more 
  than 
  a 
  variation, 
  induced 
  probably 
  by 
  the 
  compara- 
  

   tive 
  nutrition 
  of 
  the 
  polypes. 
  The 
  dentate 
  free 
  edge 
  of 
  the 
  smaller 
  

   septa 
  is 
  very 
  well 
  marked, 
  and 
  is 
  not 
  noticed 
  in 
  Milne-Edwards's 
  

   description. 
  The 
  San-Domingan 
  Coral 
  is 
  therefore 
  a 
  very 
  interest- 
  

   ing 
  form, 
  and 
  must 
  be 
  considered 
  a 
  variety 
  of 
  the 
  Eocene 
  species. 
  

   It 
  differs 
  from 
  the 
  recent 
  Antillian 
  species 
  Solenastrcm 
  Bournoni, 
  

   Edwards 
  & 
  Haime, 
  and 
  all 
  the 
  other 
  known 
  recent 
  forms, 
  whilst 
  the 
  

   long 
  corallites 
  and 
  crowded 
  septa 
  of 
  the 
  Miocene 
  JSolenastrcea 
  Turo- 
  

   nensis 
  are 
  too 
  prominent 
  peculiarities 
  to 
  be 
  mistaken. 
  

  

  27. 
  SlDERASTR.EA 
  GRANDIS, 
  nob. 
  

  

  A 
  small 
  fragment 
  of 
  this 
  well-marked 
  species, 
  described 
  in 
  Part 
  I. 
  

   under 
  the 
  Jamaican 
  fossil 
  Corals, 
  is 
  amongst 
  the 
  specimens 
  from 
  the 
  

   silt 
  of 
  the 
  Sandstone 
  plain, 
  San 
  Domingo. 
  Coll. 
  Geol. 
  Soc. 
  

  

  28. 
  Pocillopora 
  crassoramosa, 
  spec. 
  nov. 
  PI. 
  Y. 
  figs. 
  2a, 
  2b. 
  

   Pocillopora, 
  spec, 
  nov., 
  Lonsdale 
  MS. 
  

  

  Corallum 
  dendroid, 
  with 
  large 
  cylindrical 
  branches, 
  which 
  are 
  

   thick, 
  long, 
  and 
  marked, 
  on 
  one 
  side 
  only, 
  by 
  verrucosities; 
  these 
  are 
  

   sharp, 
  wart-like 
  elevations, 
  covered 
  with 
  calices, 
  and 
  placed, 
  more 
  or 
  

   less, 
  in 
  longitudinal 
  parallel 
  series, 
  at 
  all 
  heights 
  of 
  the 
  Coral. 
  

   Calices 
  numerous, 
  small, 
  nearly 
  circular, 
  and 
  very 
  equal 
  in 
  size. 
  

   Columella 
  small 
  and 
  often 
  not 
  to 
  be 
  seen 
  ; 
  where 
  it 
  exists, 
  some 
  small 
  

   papilla} 
  are 
  also 
  seen, 
  and 
  ten 
  or 
  twelve 
  rudimentary 
  septa 
  likewise. 
  

   Fossa 
  shallow. 
  Intercalicular 
  tissue 
  dense 
  and 
  sparely 
  granular 
  on 
  

   its 
  free 
  surface, 
  where 
  there 
  are 
  often 
  seen 
  irregular 
  polygonal 
  lines. 
  

   Costse 
  none. 
  Tabulae 
  vary 
  in 
  thickness. 
  The 
  centre 
  of 
  the 
  branches 
  

   is 
  occupied 
  by 
  lax 
  longitudinal 
  corallites, 
  without 
  intercorallite 
  tissue. 
  

   Thickness 
  of 
  branches 
  from 
  1| 
  inch 
  to 
  -^ 
  inch 
  ; 
  diameter 
  of 
  calice 
  

   about 
  -gL 
  to 
  -Jjj 
  inch 
  ; 
  diameter 
  of 
  intercorallite 
  space 
  -^ 
  to 
  J$ 
  inch. 
  

  

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

  

  