﻿INFERIOR 
  OOLITE 
  OF 
  SHIPTON 
  GORGE, 
  DORSET. 
  567 
  

  

  elliptical, 
  with 
  closures 
  well 
  within 
  the 
  orifice 
  and 
  punctate 
  like 
  the 
  

   surface 
  of 
  the 
  zoarium. 
  Zoarial 
  surface 
  coarsely 
  wrinkled 
  and 
  

   punctate, 
  the 
  terminations 
  of 
  the 
  pores 
  protruding 
  slightly 
  above 
  

   the 
  surface. 
  The 
  cluster 
  of 
  cells 
  connected 
  with 
  the 
  colony 
  shown 
  

   (PL 
  XVII. 
  fig. 
  3) 
  indicates 
  a 
  mode 
  of 
  gemmation 
  similar 
  to 
  that 
  

   Hincks 
  has 
  described 
  in 
  Stomatopora 
  fascicidata 
  (Brit. 
  Marine 
  

   Polyzoa, 
  p. 
  441). 
  

  

  Prom 
  S. 
  repens 
  (Busk), 
  Crag 
  Polyzoa, 
  pi. 
  xx. 
  fig. 
  5, 
  it 
  is 
  separated 
  

   by 
  the 
  larger 
  cells 
  and 
  more 
  irregular 
  habit 
  ; 
  from 
  S. 
  major, 
  Johnst., 
  

   also 
  by 
  the 
  latter 
  feature 
  and 
  by 
  the 
  shape 
  of 
  the 
  zooecia. 
  

  

  Var. 
  brevis, 
  nov. 
  (PL 
  XVIII. 
  figs. 
  1, 
  2.) 
  

  

  Zocecial 
  length 
  0*93 
  to 
  0*6 
  millim., 
  width 
  0*2-0*3; 
  aperture 
  

   0-13-0*17. 
  

  

  Zoarium 
  of 
  similar 
  habit 
  to 
  that 
  of 
  S. 
  spatiosa, 
  but 
  with 
  rather 
  

   smaller 
  and 
  less 
  robust 
  zocecia, 
  their 
  exsert 
  parts 
  longer 
  and 
  only 
  

   slightly 
  diminishing 
  in 
  size 
  towards 
  the 
  aperture. 
  In 
  both 
  uniserial 
  

   and 
  other 
  stages 
  it 
  is 
  frequently 
  met 
  with 
  encircling 
  the 
  stems 
  of 
  

   Entalophora. 
  Ovicell 
  (?) 
  apparently 
  an 
  inflation 
  of 
  a 
  single 
  cell. 
  

  

  Var. 
  breyior, 
  nov. 
  (PL 
  XVIII. 
  figs. 
  3-5.) 
  

  

  Zooecial 
  length 
  0*7 
  millim., 
  width 
  0*3 
  ; 
  aperture 
  0*1. 
  

  

  The 
  distinction 
  from 
  var. 
  brevis 
  is 
  almost 
  wholly 
  in 
  point 
  of 
  size 
  

   of 
  zooecia, 
  which 
  are 
  generally 
  shorter 
  in 
  proportion 
  to 
  the 
  width 
  

   and 
  with 
  smaller 
  apertures. 
  A 
  cluster 
  of 
  small 
  cells 
  occurs 
  in 
  one 
  

   specimen, 
  of 
  similar 
  type 
  to 
  that 
  noticed 
  above. 
  

  

  2. 
  Proboscina 
  orcRUSTAiirs, 
  sp. 
  nov. 
  (PL 
  XVII. 
  figs. 
  4-6.) 
  

  

  Zooecial 
  length 
  0*6 
  millim., 
  width 
  0*17 
  ; 
  aperture 
  0*1. 
  

  

  Zoarium 
  adnate, 
  ramose, 
  passing 
  almost 
  immediately 
  from 
  the 
  

   one 
  or 
  two 
  primary 
  cells 
  into 
  a 
  crowded 
  irregular 
  arrangement 
  of 
  

   zooecia 
  (fig. 
  4). 
  Zooecia 
  cylindrical, 
  compressed 
  (PL 
  XVII. 
  fig. 
  6, 
  a, 
  b), 
  

   free 
  for 
  about 
  one 
  third 
  of 
  their 
  length, 
  and 
  less 
  robust 
  than 
  in 
  P. 
  spa- 
  

   tiosa, 
  var. 
  brevior. 
  Aperture 
  elliptical 
  or 
  rarely 
  orbicular. 
  Surface 
  

   punctate 
  and 
  transversely 
  wrinkled. 
  Ovicells 
  pyramidal 
  swellings 
  of 
  

   the 
  zoarium, 
  rising 
  above 
  and 
  enveloping 
  one 
  or 
  .more 
  zooecia 
  and 
  

   opening 
  at 
  the 
  summit. 
  The 
  specimen 
  figured 
  is 
  attached 
  to 
  an 
  

   Echinus-spine, 
  and 
  occasionally 
  the 
  species 
  is 
  found 
  enveloping 
  stems 
  

   of 
  Entalophora. 
  

  

  It 
  differs 
  from 
  Proboscina 
  Jacquoti 
  and 
  P. 
  Alfredi, 
  Haime, 
  by 
  the 
  

   smaller 
  size 
  and 
  the 
  shape 
  of 
  the 
  zooecia 
  and 
  their 
  apertures, 
  also 
  by 
  

   the 
  closer 
  arrangement 
  of 
  the 
  zooecia 
  and 
  the 
  peculiar 
  form 
  of 
  ovicell 
  

   (fig. 
  6,c). 
  

  

  TUBTTLIPOBA. 
  

  

  Tubulipora, 
  Lamarck, 
  Systeme 
  d. 
  Animaux 
  sans 
  Vertebres, 
  1816. 
  

  

  1. 
  Tttbtjlipora 
  spatiosa, 
  sp. 
  nov. 
  (PL 
  XVIII. 
  figs. 
  10, 
  11.) 
  

  

  Zooecial 
  width 
  0*4 
  millim. 
  ; 
  aperture 
  0*16 
  to 
  0*17. 
  

  

  Zoarium 
  erect 
  or 
  subercct, 
  pyriform 
  or 
  cylindrical. 
  The 
  colony 
  

  

  