﻿1863.] 
  DUNCAN 
  — 
  WEST 
  INDIAN 
  CORALS. 
  29 
  

  

  systems, 
  and 
  five 
  incomplete 
  cycles. 
  Height 
  -j-J 
  inch 
  ; 
  length 
  -}-J 
  inch 
  ; 
  

   breadth 
  -j-J 
  inch. 
  

  

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

  

  A 
  specimen 
  with 
  the 
  epitheca 
  worn 
  off 
  shows 
  the 
  costce 
  and 
  the 
  

   remains 
  of 
  the 
  exotheca. 
  It 
  forms 
  Mr. 
  Lonsdale's 
  Circophyllia, 
  spe- 
  

   cies 
  1, 
  No. 
  1. 
  

  

  The 
  large 
  specimen 
  figured 
  in 
  PI. 
  Y. 
  fig. 
  5 
  is 
  from 
  the 
  Jamaican 
  

   Miocene 
  ; 
  it 
  is 
  described 
  in 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xix. 
  p. 
  441, 
  

   and 
  should 
  have 
  been 
  figured 
  in 
  PI. 
  XVI. 
  of 
  that 
  volume. 
  Its 
  colu- 
  

   mella 
  is 
  very 
  distinct. 
  

  

  14. 
  Antillia 
  dentata, 
  spec. 
  nov. 
  PI. 
  III. 
  figs. 
  2 
  «-2 
  c. 
  

  

  CircophylUa, 
  species 
  (new), 
  Lonsdale 
  MS. 
  

  

  Corallum 
  simple, 
  straight, 
  subturbinate, 
  slightly 
  compressed 
  above, 
  

   with 
  a 
  nipple 
  -shaped 
  pedicel 
  which 
  does 
  not 
  present 
  any 
  trace 
  of 
  a 
  

   former 
  adherence. 
  Pull-grown 
  individuals 
  are 
  tall 
  and 
  slightly 
  com- 
  

   pressed, 
  have 
  an 
  ovato-elliptical 
  calice, 
  a 
  subcylindrical 
  upper 
  part, 
  

   which 
  is 
  slightly 
  constricted 
  near 
  the 
  calicular 
  margin, 
  and 
  a 
  conico- 
  

   convex 
  inferior 
  extremity, 
  terminating 
  in 
  a 
  constricted 
  pedicel, 
  

   which 
  is 
  flattened 
  inferiorly 
  and 
  marked 
  by 
  a 
  small 
  circular 
  basal 
  

   process, 
  whence 
  visible 
  costa3 
  radiate. 
  Calice 
  elliptical 
  in 
  outline, 
  

   on 
  an 
  even 
  plane 
  ; 
  widely 
  open, 
  shallow, 
  and 
  presenting 
  a 
  small 
  

   central 
  deep 
  fossula, 
  bounded 
  below 
  by 
  the 
  columella, 
  and 
  laterally 
  

   by 
  the 
  vertical 
  inner 
  edges 
  of 
  the 
  larger 
  septa. 
  Between 
  the 
  fossula 
  

   and 
  the 
  calicular 
  margin 
  are 
  the 
  septa, 
  which, 
  arched 
  at 
  the 
  wall, 
  

   pass 
  inwards, 
  almost 
  in 
  a 
  straight 
  line, 
  at 
  an 
  angle 
  of 
  45°, 
  the 
  upper 
  

   margin 
  of 
  the 
  larger 
  septa 
  being 
  terminated 
  at 
  the 
  fossula 
  in 
  a 
  ver- 
  

   tical 
  line 
  which 
  forms 
  their 
  inner 
  edge. 
  The 
  septal 
  boundary 
  to 
  the 
  

   fossula 
  is 
  formed 
  by 
  twenty-four 
  lamelloe, 
  and 
  the 
  interseptal 
  loculi 
  

   extend 
  deejay 
  by 
  the 
  side 
  of 
  the 
  columella. 
  There 
  are 
  six 
  systems 
  of 
  

   septa 
  and 
  five 
  cycles 
  ; 
  the 
  lamella) 
  are 
  well 
  developed, 
  and 
  there 
  is 
  

   little 
  difference 
  between 
  the 
  primary, 
  secondary, 
  and 
  tertiary, 
  which 
  

   are 
  long, 
  straight, 
  a 
  little 
  larger 
  at 
  the 
  wall 
  than 
  the 
  others, 
  arched 
  

   at 
  the 
  wall, 
  but 
  little 
  inclined, 
  and 
  marked 
  on 
  their 
  upper 
  margin 
  

   by 
  very 
  prominent, 
  angular, 
  and 
  projecting 
  serratures. 
  Near 
  the 
  

   fossula 
  the 
  serratures 
  cease, 
  and 
  a 
  round 
  lobe 
  is 
  generally 
  seen. 
  The 
  

   lamella? 
  are 
  larger 
  at 
  the 
  wall 
  than 
  elsewhere, 
  and 
  taper 
  gradually 
  ; 
  

   they 
  are 
  broad 
  and 
  granular, 
  especially 
  towards 
  the 
  inner 
  half; 
  for, 
  

   externally, 
  the 
  oblique 
  dissepiments 
  appear 
  almost 
  to 
  replace 
  the 
  

   granules 
  by 
  their 
  connexion 
  with 
  the 
  septa. 
  The 
  septa 
  of 
  the 
  

   fourth 
  and 
  fifth 
  cycles 
  are 
  smaller, 
  those 
  of 
  the 
  last 
  being 
  the 
  

   smallest, 
  and 
  reaching 
  but 
  a 
  little 
  way 
  from 
  the 
  wall 
  ; 
  the 
  others 
  

   are 
  midway 
  in 
  size 
  between 
  the 
  fifth 
  and 
  the 
  third 
  cycles, 
  and 
  are 
  

   serrate. 
  The 
  granules 
  are 
  prominent, 
  variable 
  in 
  size, 
  and 
  not 
  

   crowded. 
  The 
  columella 
  is 
  seen 
  at 
  the 
  bottom 
  of 
  the 
  fossa 
  ; 
  its 
  sur- 
  

   face 
  is 
  flat, 
  and 
  is 
  formed 
  by 
  the 
  blunt 
  terminations 
  of 
  the 
  consti- 
  

   tuent 
  twisted 
  sclerenchyma; 
  it 
  is 
  not 
  papillose, 
  but 
  dense 
  and 
  spongy. 
  

   CostaB 
  numerous, 
  corresponding 
  with 
  the 
  septa, 
  much 
  covered 
  by 
  

   epitheca, 
  and 
  visible 
  at 
  the 
  mammillary 
  pedicel. 
  Where 
  they 
  are 
  

   covered 
  by 
  epitheca, 
  they 
  are 
  only 
  to 
  be 
  distinguished 
  by 
  the 
  faint 
  

  

  