﻿50 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  Fig. 
  23.— 
  Cea 
  granulata, 
  new 
  species. 
  A, 
  B. 
  

   Longitudinal 
  and 
  transverse 
  sections, 
  X 
  16. 
  

  

  peristomes, 
  0.40 
  mm.; 
  diameter 
  of 
  orifice 
  without 
  facettes, 
  0.20- 
  

   0.24 
  mm.; 
  diameter 
  of 
  zoarium, 
  3 
  mm. 
  

  

  Structure. 
  — 
  The 
  most 
  frequent 
  aspect 
  is 
  that 
  of 
  Figure 
  9; 
  the 
  ori- 
  

   fices 
  are 
  large 
  and 
  more 
  or 
  less 
  transverse. 
  The 
  latter 
  are 
  sometimes 
  

   elongated 
  (fig. 
  11). 
  The 
  tubes 
  are 
  occasionally 
  visible 
  below 
  the 
  

   orifices, 
  but 
  they 
  remain 
  indistinct. 
  As 
  in 
  all 
  the 
  Ceidae, 
  the 
  fa- 
  

   cettes 
  are 
  rarely 
  preserved 
  (fig. 
  13) 
  ; 
  

   they 
  are 
  perforated 
  by 
  an 
  orbicular 
  

   aperture. 
  

  

  In 
  longitudinal 
  section 
  the 
  tubes 
  

   are 
  club-shaped 
  with 
  walls 
  thickened 
  

   at 
  their 
  extremity; 
  the 
  gemmation 
  

   is 
  triparietal 
  on 
  a 
  basal 
  lamella. 
  

  

  In 
  transverse 
  section 
  the 
  tubes 
  are 
  

   polygonal, 
  with 
  thin 
  walls 
  in 
  the 
  vi- 
  

   cinity 
  of 
  the 
  basal 
  lamella. 
  They 
  

   have 
  a 
  center, 
  rounded 
  toward 
  the 
  

   periphery 
  by 
  an 
  internal 
  secretion 
  

  

  Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  because 
  the 
  polygonal 
  Walls 
  are 
  al- 
  

   England 
  . 
  -i 
  i 
  

  

  ways 
  visible. 
  

   The 
  ovicell 
  is 
  not 
  known. 
  

  

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

   (common) 
  . 
  

  

  Coty 
  pes. 
  —Cut. 
  No. 
  69899, 
  U.S.N.M. 
  

  

  Family 
  DIAPEROECIIDAE 
  Canu, 
  1918 
  

  

  Genus 
  DIAPEROECIA 
  Canu, 
  1918 
  

  

  DIAPEROECIA 
  (?) 
  SIMPLEX, 
  new 
  species 
  

  

  Plate 
  4, 
  fig. 
  16 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  unilamellar; 
  the 
  noncellular 
  face 
  is 
  

   transversely 
  striated. 
  The 
  tubes 
  are 
  quite 
  salient, 
  arranged 
  in 
  

   quincunx; 
  the 
  orifices 
  are 
  orbicular; 
  the 
  peristomes 
  are 
  thick. 
  The 
  

   ovicell 
  is 
  a 
  limited 
  sack, 
  very 
  convex, 
  perforated 
  by 
  a 
  normal 
  tube 
  ; 
  

   the 
  oeciostome 
  is 
  small, 
  salient, 
  placed 
  at 
  the 
  middle 
  of 
  the 
  ovicell. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.12 
  mm.; 
  diameter 
  of 
  

   peristome, 
  0.18 
  mm.; 
  diameter 
  of 
  oeciostome, 
  0.10 
  mm. 
  

  

  Affinities. 
  — 
  This 
  species 
  is 
  not 
  a 
  typical 
  Diaperoecia, 
  but 
  we 
  have 
  

   classified 
  it 
  in 
  this 
  genus 
  because 
  of 
  the 
  median 
  oeciostome. 
  It 
  ap- 
  

   pears 
  intermediate 
  between 
  Diaperoecia 
  and 
  Tubulipora, 
  but 
  more 
  

   specimens 
  are 
  necessary 
  before 
  the 
  species 
  can 
  be 
  classified 
  without 
  

   doubt. 
  

  

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

  

  Holotype.— 
  Cat. 
  No. 
  69900, 
  U.S.N.M. 
  

  

  