﻿568 
  MR. 
  E. 
  A. 
  WALFORD 
  ON" 
  SOME 
  BRT0Z0A 
  FROM 
  THE 
  

  

  commences 
  with 
  a 
  Stomatoporoid 
  form 
  of 
  growth, 
  and 
  spreads 
  out 
  

   rapidly, 
  the 
  branches 
  frequently 
  coalescing. 
  Zooecia 
  cylindrical, 
  

   the 
  exsert 
  parts 
  either 
  of 
  uniform 
  diameter 
  or 
  tapering 
  towards 
  

   the 
  aperture, 
  or 
  slightly 
  flattened. 
  Aperture 
  orbicular 
  or 
  elliptical, 
  

   the 
  cell-walls 
  thick. 
  In 
  well-preserved 
  examples 
  the 
  mouth 
  

   is 
  lipped 
  similarly 
  to 
  the 
  species 
  Tubulipora 
  ventricosa, 
  Busk. 
  

   Closures 
  well 
  within 
  the 
  mouth, 
  punctate. 
  Ovicell 
  a 
  globose 
  swelling, 
  

   somewhat 
  pyramidal, 
  involving 
  one 
  or 
  more 
  zooecia. 
  Zoarial 
  surface 
  

   coarsely 
  wrinkled 
  and 
  punctate. 
  

  

  The 
  form 
  (PI. 
  XVIII. 
  fig. 
  11) 
  tends 
  to 
  a 
  Pustulop>ora-\ike 
  growth, 
  

   and 
  one 
  sees 
  the 
  funnel-shaped 
  ovicell 
  of 
  a 
  similar 
  type 
  to 
  that 
  found 
  

   on 
  Entalopliora 
  magnipora 
  (PL 
  XIX. 
  fig. 
  11). 
  Other 
  but 
  suberect 
  

   forms 
  approach 
  Tubulipora 
  Jlabellaris, 
  Johnst. 
  

  

  There 
  is 
  little 
  doubt 
  of 
  this 
  species 
  being 
  another 
  stage 
  of 
  growth 
  

   of 
  my 
  Proboscina 
  spatiosa. 
  It 
  has 
  many 
  points 
  of 
  resemblance 
  to 
  

   Tubulipora 
  ventricosa, 
  Busk, 
  but 
  yet 
  I 
  think 
  it 
  merits 
  distinction. 
  

  

  lust 
  as 
  I 
  noted 
  of 
  Proboscina 
  spatiosa, 
  that 
  it 
  was 
  connected 
  

   with 
  forms 
  of 
  identical 
  zoarial 
  habit, 
  varying 
  principally 
  in 
  size 
  of 
  

   zooecia, 
  so 
  also 
  in 
  this 
  group 
  are 
  specimens 
  with 
  zooecia 
  less 
  robust, 
  

   measuring 
  but 
  0'3 
  millim. 
  in 
  width, 
  and 
  with 
  apertures 
  of 
  only 
  013 
  

   millim. 
  in 
  diameter. 
  

  

  Idmonea. 
  

   Idmonea, 
  Lamouroux, 
  Exp. 
  meth. 
  des 
  genres 
  des 
  Pol. 
  p. 
  80 
  (1821). 
  

  

  1. 
  Idmonea 
  stomatoporoides, 
  sp. 
  nov. 
  (PI. 
  XIX. 
  figs. 
  5, 
  6.) 
  

  

  Zoarial 
  length 
  4-0 
  millim.; 
  width 
  0'5 
  ; 
  aperture 
  (perfect) 
  0*03, 
  

   (worn) 
  0-07. 
  

  

  Zoarium 
  wholly 
  adnate, 
  broadly 
  angular, 
  straight, 
  waved 
  or 
  

   encircling, 
  attached 
  to 
  stems 
  of 
  Entalopliora 
  or 
  shells. 
  Zooecia 
  

   nearly 
  immersed, 
  arranged 
  in 
  pairs 
  obliquely, 
  so 
  as 
  to 
  give 
  the 
  

   appearance 
  of 
  alternating 
  apertures 
  on 
  right 
  and 
  left 
  sides 
  of 
  zoarial 
  

   ridge, 
  often 
  single 
  and 
  irregular 
  at 
  the 
  beginning 
  of 
  a 
  colony. 
  

   Proximal 
  extremities 
  of 
  zooecia 
  erect 
  and 
  mammiform. 
  Aperture 
  

   orbicular. 
  

  

  The 
  size 
  of 
  the 
  specimens 
  shows 
  this 
  species 
  not 
  to 
  be 
  an 
  imma- 
  

   ture 
  stage 
  of 
  /. 
  triquetra, 
  Lamx., 
  which, 
  moreover, 
  has 
  six 
  matured 
  

   cells 
  on 
  each 
  side 
  of 
  the 
  zoarium 
  when 
  adherent. 
  

  

  2. 
  Idmonea 
  triquetra, 
  Lamx., 
  var. 
  Y-formis, 
  nov. 
  (PI. 
  XIX. 
  

  

  figs. 
  3, 
  4.) 
  

   Idmonea 
  triquetra, 
  Lamouroux, 
  Exp. 
  meth. 
  des 
  genres 
  des 
  Pol. 
  p. 
  80, 
  

   pi. 
  79. 
  figs. 
  13-15 
  (1821); 
  Morris, 
  Catalogue 
  of 
  Brit. 
  Eoss. 
  p. 
  40 
  

   (1843) 
  ; 
  d'Orbigny, 
  Paleont. 
  Eranc., 
  Terr. 
  Cret. 
  t. 
  v. 
  pp. 
  729, 
  751 
  

   (1850-52); 
  Haime,Descr. 
  des 
  Bryoz. 
  Eoss. 
  dela 
  Eorm. 
  Jurass. 
  p. 
  171, 
  

   pi. 
  7. 
  fig. 
  1 
  (1854) 
  : 
  Vine, 
  Polyzoa 
  found 
  in 
  Richmond 
  Boring, 
  p. 
  790, 
  

   Q. 
  J. 
  G. 
  S. 
  1884 
  ; 
  Sorby 
  and 
  Vine, 
  Eifth 
  Rep. 
  on 
  Fossil 
  Polyzoa, 
  

   Brit. 
  Assoc, 
  p. 
  43 
  (1884) 
  ; 
  Vine, 
  Notes 
  on 
  Polyzoa 
  of 
  Caen 
  and 
  

   Ranville, 
  p. 
  7, 
  Journ. 
  Northampton. 
  Nat. 
  Hist. 
  Soc. 
  1888. 
  

  

  