﻿ABT.2I 
  CYCL.OSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  43 
  

  

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

   stome, 
  0.14 
  mm.; 
  distance 
  of 
  peristomes, 
  0.30 
  mm.; 
  separation 
  of 
  

   peristomes, 
  0.40 
  mm. 
  

  

  Variations. 
  — 
  The 
  tubes 
  with 
  prominent 
  threads 
  are 
  visible 
  only 
  

   on 
  the 
  specimens 
  with 
  worn 
  and 
  little 
  salient 
  peristomes. 
  The 
  sepa- 
  

   ration 
  of 
  the 
  peristomes 
  can 
  be 
  measured 
  only 
  on 
  specimens 
  where 
  

   they 
  are 
  arranged 
  in 
  quinqunx. 
  

  

  The 
  ovicell 
  is 
  somewhat 
  different 
  from 
  that 
  in 
  other 
  species 
  and 
  

   resembles 
  Trigonoecia. 
  It 
  differs, 
  nevertheless, 
  in 
  the 
  absence 
  of 
  

   transverse 
  wrinkles. 
  Moreover, 
  we 
  know 
  that 
  the 
  typical 
  expanded 
  

   form 
  visible 
  on 
  the 
  lamellar 
  zoarium 
  disappears 
  easily 
  on 
  these 
  cylin- 
  

   drical 
  specimens. 
  

  

  Structure. 
  — 
  The 
  sections 
  are, 
  indeed, 
  those 
  of 
  the 
  genus 
  Cardioecia. 
  

   In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  club-shaped, 
  with 
  moniliform 
  

   walls, 
  but 
  very 
  thick 
  and 
  strongly 
  calcified; 
  the 
  gemmation 
  is 
  tri- 
  

   parietal 
  on 
  the 
  median 
  lamella. 
  

  

  In 
  transverse 
  section 
  the 
  tubes 
  are 
  orbicular 
  or 
  elliptical, 
  with 
  

   diameter 
  increasing 
  toward 
  the 
  periphery. 
  The 
  walls 
  here 
  are 
  very 
  

   thick. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous 
  (Valangian) 
  : 
  Sainte-Croix 
  (Vaud), 
  

   Switzerland. 
  

  

  Cotypes.— 
  Cat. 
  No. 
  69891, 
  U.S.N.M. 
  

  

  CARDIOECIA 
  HYSELYI 
  De 
  Loriol, 
  1869 
  

  

  Plate 
  3, 
  figs. 
  5-8 
  

  

  1869. 
  Mesenteripora 
  hyselyi 
  De 
  Loriol 
  and 
  Gillieron, 
  Monographie 
  paleon- 
  

   tologique 
  de 
  l'Urgonian 
  de 
  Landeron, 
  Memoires 
  Society 
  helvetique 
  des 
  

   Sciences 
  naturelies, 
  vol. 
  23, 
  p. 
  40, 
  pi. 
  3, 
  fig. 
  1. 
  

  

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

   stome, 
  0.26 
  mm.; 
  diameter 
  of 
  tubes, 
  0.24 
  mm.; 
  distance 
  of 
  peri- 
  

   stomes, 
  0.40-0.70 
  mm.; 
  separation 
  of 
  peristomes, 
  0.52-0.60 
  mm. 
  

  

  Affinities. 
  — 
  We 
  have 
  not 
  examined 
  De 
  Loriol's 
  figured 
  type 
  and 
  

   we 
  are 
  not 
  very 
  certain 
  of 
  our 
  determination. 
  De 
  Loriol's 
  descrip- 
  

   tions 
  and 
  figures 
  were 
  always 
  incomplete 
  and 
  inexact. 
  

  

  The 
  tubes 
  are 
  visible 
  or 
  invisible; 
  the 
  peristomes 
  are 
  little 
  or 
  very 
  

   salient, 
  sometimes 
  arranged 
  in 
  verticells. 
  The 
  ovicell 
  is 
  cordiform, 
  

   rather 
  regular, 
  little 
  convex. 
  The 
  zone 
  of 
  growth 
  is 
  thick. 
  

  

  The 
  sections 
  are 
  identical 
  with 
  those 
  of 
  Cardioecia 
  neocomiensis 
  

   D'Orbigny, 
  1853, 
  but 
  the 
  present 
  species, 
  which 
  has 
  a 
  similar 
  exte- 
  

   rior 
  aspect, 
  differs 
  in 
  its 
  larger 
  peristomes 
  and 
  in 
  its 
  foliated 
  and 
  

   much 
  broader 
  fronds. 
  

  

  Occurrence. 
  — 
  Lower 
  Cretaceous: 
  Sainte-Croix 
  (Vaud), 
  Switzer- 
  

   land; 
  (Valangian), 
  Landeron 
  (Neuchatel), 
  Switzerland 
  (Urgonian). 
  

  

  Plesioty 
  pes. 
  —Cat. 
  No. 
  69892, 
  U.S.N.M. 
  

  

  