﻿44 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  CARDIOECIA 
  FARINGDONENSIS, 
  new 
  species 
  

  

  Plate 
  3, 
  figs. 
  9-15 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical 
  or 
  compressed, 
  with, 
  

   bifurcated 
  fronds. 
  The 
  tubes 
  are 
  short, 
  visible, 
  convex, 
  separated 
  

   by 
  a 
  little 
  developed 
  furrow; 
  the 
  peristomes 
  are 
  obicular, 
  salient, 
  

   thick, 
  arranged 
  in 
  quincunx 
  or 
  in 
  close 
  verticells. 
  The 
  zone 
  of 
  

   growth 
  is 
  broad 
  or 
  conical. 
  The 
  ovicell 
  is 
  cordiform, 
  little 
  salient, 
  

   smooth; 
  the 
  oeciostome 
  is 
  salient, 
  small, 
  orbicular. 
  The 
  base 
  is 
  a 
  

   little 
  expanded. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.14 
  mm.; 
  diameter 
  of 
  peri- 
  

   stomes, 
  0.28 
  mm.; 
  distance 
  of 
  peristomes, 
  0.48-0.60 
  mm.; 
  separa- 
  

   tion 
  of 
  peristomes, 
  0.80 
  mm. 
  

  

  Structure. 
  — 
  In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  long, 
  club-shaped, 
  

   with 
  moniliform 
  walls, 
  much 
  expanded 
  in 
  their 
  terminal 
  portion; 
  

   they 
  appear 
  closed 
  by 
  pseudofacettes 
  on 
  account 
  of 
  the 
  closeness 
  of 
  

   the 
  peristomes. 
  The 
  gemmation 
  is 
  triparietal 
  on 
  a 
  median 
  lamella. 
  

  

  In 
  transverse 
  section 
  the 
  tubes 
  are 
  round, 
  increasing 
  in 
  size 
  toward 
  

   the 
  periphery, 
  separated 
  by 
  the 
  vesicular 
  tissue 
  of 
  the 
  thickened 
  

   walls. 
  The 
  median 
  lamella 
  is 
  not 
  always 
  rectilinear. 
  

  

  In 
  meridian 
  sections 
  the 
  tubes 
  are 
  lozenge-shaped 
  in 
  the 
  axis 
  of 
  

   the 
  median 
  lamella, 
  which 
  does 
  not 
  entirely 
  traverse 
  the 
  zoarium; 
  

   the 
  lateral 
  tubes 
  have 
  the 
  normal 
  form. 
  

  

  Affinities. 
  — 
  This 
  beautiful 
  species 
  has 
  the 
  exterior 
  aspect 
  of 
  Car- 
  

   dioecia 
  neocomiensis 
  D'Orbigny, 
  1853, 
  but 
  it 
  differs 
  in 
  its 
  larger 
  

   micrometric 
  dimensions 
  in 
  its 
  fronds 
  being 
  much 
  less 
  expanded 
  and 
  

   more 
  frequently 
  cylindrical. 
  

  

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

   (common). 
  

  

  Coty 
  pes. 
  —Cat. 
  No. 
  69893, 
  U.S.N.M. 
  

  

  CARDIOECIA 
  PAUPER, 
  new 
  species 
  

  

  Plate 
  5, 
  figs. 
  1, 
  2 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical. 
  The 
  tubes 
  are 
  

   indistinct, 
  scarcely 
  convex, 
  smooth. 
  The 
  peristomes 
  are 
  arranged 
  

   in 
  transverse 
  rows 
  or 
  in 
  quincunx; 
  they 
  are 
  orbicular, 
  thin, 
  little 
  

   salient. 
  The 
  zone 
  of 
  growth 
  is 
  an 
  elevated 
  cone. 
  The 
  ovicell 
  is 
  

   small, 
  elliptical, 
  transverse, 
  little 
  convex, 
  smooth. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aperture, 
  0.14 
  mm.; 
  diameter 
  of 
  

   peristome, 
  0.18 
  mm.; 
  distance 
  of 
  peristomes, 
  0.48-0.56 
  mm.; 
  sepa- 
  

   ration 
  of 
  peristomes, 
  0.64 
  mm. 
  ; 
  diameter 
  of 
  zoarium, 
  3 
  mm. 
  

  

  Affinities. 
  — 
  We 
  figure 
  the 
  two 
  sides 
  of 
  the 
  same 
  specimen 
  in 
  order 
  

   to 
  show 
  that 
  the 
  peristomes 
  are 
  arranged 
  in 
  transverse 
  rows 
  on 
  one 
  

  

  