﻿40 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Structure. 
  — 
  Although 
  very 
  beautiful, 
  D'Orbigny's 
  figure 
  is 
  not 
  com- 
  

   plete. 
  A 
  considerable 
  number 
  of 
  tubes 
  bear 
  at 
  their 
  base 
  large 
  trans- 
  

   verse 
  wrinkles. 
  They 
  are 
  not 
  constant, 
  it 
  is 
  true; 
  when 
  the 
  tubes 
  

   are 
  very 
  long 
  and 
  are 
  inserted 
  between 
  two 
  peristomes 
  (distance 
  of 
  

   1.20 
  mm.), 
  the 
  wrinkles 
  are 
  quite 
  visible 
  in 
  the 
  inferior 
  nonsalient 
  

   portion; 
  when 
  the 
  tubes 
  are 
  short 
  (distance, 
  0.70 
  mm.), 
  the 
  wrinkles 
  

   have 
  disappeared. 
  

  

  We 
  have 
  not 
  observed 
  the 
  ovicell, 
  but 
  we 
  classify 
  the 
  species 
  

   provisionally 
  in 
  the 
  genus 
  Trigonoecia 
  because 
  the 
  sections 
  are 
  identi- 
  

   cal 
  with 
  those 
  of 
  other 
  species 
  of 
  the 
  genus. 
  The 
  fronds 
  being 
  un- 
  

   dulated, 
  there 
  is 
  never 
  perfect 
  symmetry 
  in 
  the 
  sections. 
  Pergens 
  

   and 
  Gregory 
  have 
  erroneously 
  identified 
  this 
  species 
  with 
  Diastopora 
  

   compressa 
  Goldfuss, 
  1827, 
  in 
  which 
  the 
  micrometric 
  measurments 
  are 
  

   much 
  smaller. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous: 
  Sainte-Croix, 
  Switzerland 
  (Val- 
  

   angian); 
  Morteau 
  (Jura), 
  France 
  (Urgonian). 
  

  

  Plesiotype.— 
  Cat. 
  No. 
  69887, 
  U.S.N.M. 
  

  

  Genus 
  CARDIOECIA 
  Canu 
  and 
  Bassler, 
  1922 
  

  

  The 
  ovicell 
  is 
  triangular, 
  transverse, 
  cordiform, 
  little 
  convex, 
  

   smooth, 
  symmetrical; 
  the 
  oeciostome 
  is 
  small, 
  salient, 
  median. 
  The 
  

   tubes 
  are 
  club-shaped, 
  with 
  tripai 
  ietal 
  gemmation 
  on 
  a 
  basal 
  lamella. 
  

  

  Genotype. 
  — 
  -Cardioecia 
  (Bidiastopora) 
  neocomiensis 
  D'Orbigny, 
  1853. 
  

   Lower 
  Cretaceous 
  (Neocomian, 
  Aptian) 
  . 
  

  

  The 
  ovicell 
  is 
  less 
  salient 
  and 
  more 
  expanded 
  than 
  in 
  Trigonoecia. 
  

   The 
  tubes 
  are 
  longer 
  and 
  club-shaped. 
  The 
  latter 
  character 
  is 
  clearly 
  

   visible 
  in 
  transverse 
  sections, 
  which 
  have 
  a 
  larger 
  number 
  of 
  tubes 
  

   and 
  increase 
  regularly 
  from 
  center 
  to 
  circumference. 
  We 
  have 
  

   observed 
  only 
  the 
  free 
  forms 
  of 
  growth, 
  but 
  encrusting 
  forms 
  are 
  

   quite 
  possible. 
  The 
  oeciostome 
  always 
  measures 
  0.10 
  mm. 
  and 
  the 
  

   oeciopore 
  0.06 
  mm. 
  No 
  exceptions 
  to 
  this 
  have 
  been 
  found. 
  

  

  CARDIOECIA 
  NEOCOMIENSIS 
  D'Orbigny, 
  1853 
  

  

  Plate 
  2, 
  figs. 
  1-7 
  

  

  1853. 
  Bidiastopora 
  neocomiensis 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  

  

  Cretace, 
  vol. 
  5, 
  p. 
  800, 
  pi. 
  784, 
  figs. 
  9-11. 
  

   1902. 
  Bidiastopora 
  campicheana 
  Canu, 
  Bryozoaires 
  fossiles, 
  Collection 
  Campich. 
  

  

  Bull. 
  Soc. 
  Geol. 
  France, 
  ser. 
  4, 
  vol. 
  2, 
  p. 
  11. 
  

  

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

   stome, 
  0.16 
  mm. 
  ; 
  zooecial 
  diameter, 
  0.20 
  mm. 
  ; 
  distance 
  of 
  peristomes, 
  

   0.40-0.50 
  mm.; 
  separation 
  of 
  peristomes, 
  0.50 
  mm.; 
  width 
  of 
  large 
  

   fronds, 
  3 
  mm. 
  

  

  Variations. 
  — 
  This 
  species 
  is 
  very 
  irregular 
  and 
  D'Orbigny's 
  figure 
  

   represents 
  only 
  one 
  phase 
  of 
  it. 
  In 
  their 
  perfect 
  form 
  the 
  tubes 
  are 
  

   visible 
  and 
  salient 
  (fig. 
  2) 
  . 
  This 
  character 
  disappears 
  easily 
  even 
  on 
  

  

  