﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  63 
  

  

  Genus 
  THOLOPORA 
  Gregory, 
  1909 
  

  

  THOLOPORA 
  VIKGULOSA 
  Gregory. 
  1309 
  

  

  Plate 
  20, 
  fig. 
  1 
  

   1909. 
  Tholopora 
  virgulosa 
  Gregory, 
  Catalogue 
  of 
  the 
  Cretaceous 
  Bryozoa 
  in 
  the 
  

   British 
  Museum, 
  vol. 
  2, 
  p. 
  277. 
  (Bibliography, 
  geologic 
  distribution.) 
  

  

  Our 
  fine 
  specimen 
  corresponds 
  very 
  well 
  to 
  the 
  figures 
  of 
  Goldfuss, 
  

   1829, 
  and 
  of 
  Simonowitseh, 
  1871. 
  It 
  differs 
  from 
  the 
  isolated 
  colo- 
  

   nies 
  of 
  Tholopora 
  colligata 
  Gregory, 
  1909, 
  in 
  the 
  smaller 
  diameter 
  of 
  

   its 
  aperture 
  (0.12 
  mm. 
  and 
  not 
  0.20 
  mm.). 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  Plesiotype.— 
  Cut. 
  No. 
  69912, 
  U.S.N.M. 
  

  

  Genus 
  RADIOPORA 
  D'Orbigny, 
  1849 
  

  

  RADIOPORA 
  TUBERCULATA 
  D'Orbigny, 
  1850 
  

  

  Plate 
  20, 
  figs. 
  2-5 
  

  

  1909. 
  Radiopora 
  tuberculoid 
  Gregory, 
  Catalogue 
  of 
  the 
  Creta- 
  

   ceous 
  Bryozoa 
  in 
  the 
  British 
  Museum, 
  vol. 
  2 
  p. 
  288, 
  

   pi. 
  4, 
  fig. 
  S. 
  (Bibliography, 
  geologic 
  distribution.) 
  

  

  Diameter 
  of 
  the 
  orifices, 
  0.16-0.20 
  mm. 
  

  

  This 
  species 
  is 
  well 
  characterized 
  by 
  the 
  large 
  size 
  of 
  

   its 
  aperture. 
  The 
  zoarium 
  is 
  formed 
  of 
  many 
  super- 
  

   posed 
  lamellae 
  of 
  orbicular 
  subcolonies. 
  The 
  study 
  of 
  

   the 
  inferior 
  face 
  is 
  interesting; 
  it 
  shows 
  that 
  the 
  larva 
  

   fixes 
  itself 
  on 
  a 
  grain 
  of 
  quartz 
  and 
  that 
  the 
  basal 
  gem- 
  

   mation 
  operates 
  fan-shaped 
  fashion 
  as 
  in 
  Berenicea. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  

   England. 
  

  

  Plesiotype.— 
  Cat. 
  No. 
  69913, 
  U.S.N.M. 
  

  

  Family 
  LOBOSOECIIDAE 
  Canu 
  and 
  Bassler, 
  1922 
  

  

  Genus 
  LOBOSOECIA 
  Canu 
  and 
  Bassler, 
  1922 
  

  

  LOBOSOECIA 
  SEMICLAUSA 
  Michelin, 
  1845 
  

  

  Plate 
  14, 
  figs. 
  12-13 
  

  

  1922. 
  Lobosoecia 
  semiclausa 
  Canu 
  and 
  Bassler, 
  Studies 
  on 
  the 
  

   Cyclostomatous 
  Bryozoa, 
  Proceedings 
  U. 
  S. 
  National 
  

   Museum, 
  vol. 
  61, 
  p. 
  81, 
  pi. 
  12, 
  figs. 
  4-11. 
  (Bibliog- 
  

   raphy.) 
  

   Measurements. 
  — 
  

  

  A 
  i 
  [ha 
  — 
  0.08 
  mm. 
  

   Aperture 
  L 
  

   v 
  lla 
  = 
  0.09mm. 
  

  

  Diameter 
  of 
  branches, 
  1 
  mm. 
  

  

  Fig. 
  32. 
  — 
  Lob 
  os 
  . 
  

   coecia 
  semiclau- 
  

   sa 
  Michelin, 
  1845. 
  

  

  A. 
  Transverse 
  

   section, 
  X 
  16. 
  

  

  B. 
  Longitudinal 
  

   section, 
  X 
  16, 
  at 
  

   the 
  extremity 
  of 
  

   a 
  branch. 
  The 
  

   tubes 
  are 
  wid- 
  

   ened 
  and 
  have 
  

   dorsal 
  gemma- 
  

   tion. 
  Creta- 
  

   ceous: 
  Leinans, 
  

   France 
  

  

  Facettes 
  

  

  (hf 
  = 
  0.24 
  (max. 
  0.30) 
  mm. 
  

   llf 
  = 
  0.20 
  (max. 
  0.30) 
  mm. 
  

   Our 
  specimen 
  from 
  Faringdon 
  shows 
  

   facettes 
  a 
  little 
  longer 
  than 
  0.32 
  by 
  0.20 
  mm. 
  If 
  it 
  belongs 
  to 
  this 
  

   species 
  it 
  should 
  possibly 
  be 
  considered 
  as 
  a 
  variety. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England 
  (very 
  

   rare) 
  . 
  

  

  Plesiotype.— 
  Cat. 
  No. 
  69914, 
  U.S.N.M. 
  

   53648—26 
  5 
  

  

  