﻿

  36 
  PROCEEDINGS 
  OF 
  TflE 
  GEOLOGICAL 
  SOCIETY. 
  [KoV. 
  18, 
  

  

  18. 
  Teleiophtllia 
  navictjla, 
  gen. 
  et 
  spec. 
  nov. 
  PI. 
  IV. 
  figs. 
  1 
  a, 
  1 
  b. 
  

  

  Corallum 
  long, 
  narrow, 
  low, 
  and 
  more 
  or 
  less 
  boat-shaped 
  ; 
  not 
  

   quite 
  straight, 
  but 
  a 
  little 
  flexuous 
  ; 
  more 
  or 
  less 
  angular 
  below, 
  

   vertical, 
  convex, 
  and 
  falling-in 
  on 
  the 
  sides 
  ; 
  it 
  is 
  prow- 
  shaped 
  at 
  

   the 
  extremity 
  (one 
  remains 
  only). 
  In 
  vertical 
  section 
  the 
  outline 
  is 
  

   cordate. 
  Probably 
  it 
  had 
  a 
  pedicel 
  like 
  the 
  first 
  species. 
  Calicular 
  

   surface 
  slightly 
  sinuous, 
  narrow, 
  and 
  shallow, 
  with 
  convex 
  septa, 
  not 
  

   meeting, 
  but 
  bounding 
  the 
  indistinct 
  fossula. 
  Calicos 
  not 
  distin- 
  

   guishable. 
  Septa 
  close, 
  crowded, 
  very 
  numerous, 
  highly 
  granular 
  

   laterally, 
  the 
  series 
  of 
  granules 
  terminating 
  at 
  the 
  free 
  arched 
  and 
  

   thin 
  margin 
  in 
  regular 
  dentations. 
  The 
  septa 
  are 
  exsert, 
  and 
  for 
  

   the 
  most 
  part 
  reach 
  well 
  inwards 
  ; 
  a 
  few 
  exist 
  more 
  delicate 
  than 
  the 
  

   others, 
  which 
  are 
  nearly 
  equal 
  in 
  length, 
  breadth, 
  and 
  thickness. 
  

   Generally 
  a 
  large 
  septum 
  is 
  succeeded 
  by 
  one 
  a 
  little 
  smaller, 
  but 
  often 
  

   two 
  equal-sized 
  septa 
  are 
  found 
  together. 
  The 
  lamina) 
  are 
  thin, 
  and 
  

   very 
  little 
  thinner 
  within 
  than 
  without, 
  or 
  at 
  the 
  wall 
  ; 
  they 
  are 
  

   marked 
  by 
  a 
  series 
  of 
  granules, 
  or 
  raised 
  lines, 
  which 
  pass 
  upwards 
  

   and 
  more 
  or 
  less 
  obliquely 
  to 
  the 
  free 
  surface, 
  whose 
  dentations 
  are 
  

   equal, 
  sharp, 
  and 
  well 
  developed. 
  20 
  septa 
  in 
  \ 
  inch. 
  Although 
  the 
  

   space 
  between 
  the 
  inner 
  margins 
  of 
  the 
  septa 
  is 
  filled 
  with 
  matrix 
  

   and 
  some 
  ferruginous 
  deposit, 
  it 
  is 
  tolerably 
  clear 
  that 
  the 
  columella 
  

   is 
  lamellar, 
  and 
  that 
  the 
  exsert 
  septa 
  bound 
  a 
  deep 
  and 
  narrow 
  

   fossula. 
  Costse 
  equal 
  in 
  number 
  to 
  the 
  septa 
  ; 
  but 
  below 
  sometimes 
  

   three 
  unite 
  in 
  one, 
  to 
  be 
  continued 
  along 
  the 
  lower 
  edge 
  to 
  the 
  

   pedicel. 
  All 
  are 
  nearly 
  equal, 
  highly 
  granular 
  laterally, 
  and 
  thin 
  

   externally, 
  projecting 
  -^ 
  inch 
  from 
  the 
  wall. 
  They 
  all 
  have 
  a 
  

   relation 
  to 
  the 
  median 
  inferior 
  rib, 
  and 
  pass 
  off 
  from 
  this, 
  bifur- 
  

   cating 
  and 
  trichotomizing 
  to 
  reach 
  the 
  sides 
  of 
  the 
  Coral, 
  where 
  they 
  

   become 
  parallel 
  and 
  single. 
  Endotheca 
  vesicular 
  and 
  abundant 
  ; 
  

   the 
  dissepiments 
  attached 
  to 
  the 
  septa 
  pass 
  downwards 
  and 
  in- 
  

   wards 
  from 
  the 
  wall, 
  enclosing 
  granular 
  areas. 
  The 
  exotheca 
  is 
  also 
  

   abundant 
  and 
  vesicular, 
  the 
  costae 
  presenting 
  attached 
  dissepiments 
  

   and 
  granules. 
  The 
  wall 
  is 
  a 
  very 
  thin 
  vertical 
  lamina 
  attached 
  to 
  

   the 
  endotheca 
  and 
  exotheca, 
  and 
  connecting 
  the 
  septa. 
  Epitheca 
  

   exists 
  along 
  the 
  lower 
  edge 
  as 
  a 
  membraniform 
  investment 
  to 
  the 
  

   large 
  median 
  costas 
  and 
  their 
  interspaces. 
  

  

  The 
  specimen 
  is 
  about 
  one-half 
  of 
  its 
  original 
  length. 
  Height 
  

   \ 
  inch 
  ; 
  at 
  the 
  centre 
  j^inch; 
  length 
  (real) 
  1^ 
  inch; 
  breadth 
  | 
  inch. 
  

  

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

  

  19. 
  Mjeandkina 
  sixuosissiMA, 
  Edwards 
  & 
  Haime. 
  

  

  Worn 
  specimens 
  are 
  found 
  in 
  the 
  silt 
  of 
  the 
  Sandstone 
  plain, 
  San 
  

   Domingo. 
  The 
  species 
  is 
  recent, 
  and 
  inhabits 
  the 
  American 
  seas. 
  

  

  20. 
  Astr^a 
  Antillarum, 
  var., 
  nobis. 
  PL 
  IV. 
  fig. 
  2. 
  

  

  With 
  more 
  distant 
  calices 
  than 
  the 
  type, 
  produced 
  costae, 
  and 
  a 
  

   less 
  perfect 
  development 
  of 
  the 
  third 
  septal 
  cycle. 
  The 
  exact 
  locality 
  

   is 
  not 
  known, 
  but 
  the 
  Coral, 
  from 
  its 
  mineralogical 
  characters, 
  ap- 
  

   pears 
  to 
  have 
  been 
  obtained 
  from 
  Antigua. 
  Brit. 
  Mus. 
  

  

  