﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  49 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.16 
  mm.; 
  diameter 
  of 
  peri- 
  

   stome, 
  0.20 
  mm. 
  ; 
  distance 
  of 
  peristomes, 
  0.48-0.56 
  mm. 
  ; 
  separation 
  of 
  

   peristomes, 
  0.72 
  mm.; 
  di- 
  

   ameter 
  of 
  branches, 
  3 
  mm. 
  

  

  Structure. 
  — 
  In 
  longitud- 
  

   inal 
  sections 
  the 
  tubes 
  are 
  

   short, 
  club-shaped, 
  much 
  

   expanded 
  at 
  their 
  termi- 
  

   nal 
  parts, 
  sometimes 
  

   showing 
  pseudofacettes. 
  

   The 
  gemmation 
  is 
  dorsal, 
  

   although 
  triparietal 
  in 
  

   appearance 
  because 
  of 
  the 
  

   little 
  length 
  of 
  the 
  tubes. 
  

   The 
  walls 
  are 
  moniliform, 
  

   much 
  widened 
  at 
  their 
  

   extremity. 
  

  

  In 
  transverse 
  sections 
  

   the 
  tubes 
  are 
  rounded, 
  

   much 
  smaller 
  at 
  the 
  cen- 
  

   ter 
  than 
  at 
  the 
  circumfer- 
  

   ence, 
  with 
  vesicular 
  walls 
  

   much 
  thickened, 
  espe- 
  

   cially 
  at 
  the 
  periphery. 
  

  

  Occurrence. 
  — 
  Lower 
  

   Cretaceous 
  (Aptian) 
  : 
  

   Faringdon, 
  England 
  

  

  . 
  Fig. 
  22.— 
  Notoplagioecia 
  faringdonensis 
  Canu 
  and 
  Bassler, 
  1922. 
  

  

  (Common) 
  . 
  A, 
  B. 
  Two 
  transverse 
  sections, 
  X 
  16. 
  C. 
  Longitudinal 
  section, 
  

  

  CotypeS. 
  Cat. 
  No. 
  x 
  16, 
  showing 
  the 
  club-shaped 
  tubes, 
  the 
  pseudofacettes, 
  and 
  

  

  n^r,-. 
  ^ 
  iTfi 
  wif 
  the 
  vesicular 
  walls. 
  Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  

  

  68718, 
  U.S. 
  N.M. 
  England 
  

  

  Genus 
  CEA 
  D'Orbigny, 
  1852 
  

  

  CEA 
  GRANULATA, 
  new 
  species 
  

  

  Plate 
  5, 
  figs. 
  6-14 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  formed 
  of 
  narrow, 
  compressed 
  

   bifurcated 
  fronds. 
  The 
  tubes 
  are 
  rarely 
  visible. 
  The 
  orifices 
  with- 
  

   out 
  facette 
  are 
  large, 
  polygonal, 
  irregular, 
  elongated 
  or 
  transverse. 
  

   The 
  facettes 
  are 
  indistinct, 
  flat, 
  granular. 
  The 
  peristomes 
  are 
  orbi- 
  

   cular, 
  thin, 
  salient, 
  arranged 
  in 
  quincunx. 
  The 
  zone 
  of 
  growth 
  is 
  

   large, 
  becoming 
  thinner 
  on 
  the 
  median 
  lamella. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.10 
  mm.; 
  diameter 
  of 
  peri- 
  

   stomes, 
  0.14 
  mm.; 
  distance 
  of 
  peristomes, 
  0.40 
  mm.; 
  separation 
  of 
  

   53648—26 
  4 
  

  

  