﻿CYCLOSTOMATOUS 
  BEYOZOA 
  CANU 
  AND 
  BASSLEB 
  

  

  83 
  

  

  REPTOCLAUSA 
  NEOCOMIENSIS 
  D'Orbigny, 
  1853 
  

  

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

  

  Cretace, 
  vol. 
  5, 
  p. 
  888, 
  pi. 
  765, 
  figs. 
  1, 
  2. 
  

   1899. 
  Idmonea 
  neocomiensis 
  Gregory, 
  Catalogue 
  of 
  the 
  Cretaceous 
  Bryozoa 
  in 
  

  

  the 
  British 
  Museum, 
  vol. 
  1, 
  p. 
  155. 
  (Bibliography.) 
  

  

  This 
  species 
  is 
  well 
  characterized 
  by 
  its 
  short 
  fascicles 
  arranged 
  in 
  

   quincunx. 
  

  

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

   Mont 
  Saleve, 
  Switzerland, 
  and 
  Villers-le-Lac 
  (Doubs), 
  France. 
  

  

  Family 
  TRETOCYCLOECIIDAE 
  Canu, 
  1919 
  

  

  Genus 
  TRETOCYCLOECIA 
  Canu, 
  1919 
  

  

  TRETOCYCLOECIA 
  (?) 
  MULTIPOROSA, 
  new 
  species 
  

  

  Plate 
  16, 
  figs. 
  5-8 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  small, 
  cylindrical, 
  bifurcated. 
  The 
  

   orifice 
  is 
  orbicular; 
  the 
  peristomes 
  are 
  thin, 
  salient, 
  arranged 
  in 
  

   quincunx, 
  scattered 
  or 
  in 
  annular 
  

   rows. 
  The 
  mesopores 
  are 
  large, 
  

   numerous, 
  polygonal, 
  irregularly 
  

   placed 
  around 
  the 
  orifices. 
  The 
  ovi- 
  

   cell 
  is 
  orbicular. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  aper- 
  

   ture, 
  0.08 
  mm. 
  ; 
  diameter 
  of 
  peri- 
  

   stome, 
  0.10 
  mm.; 
  diameter 
  of 
  zoar- 
  

   ium, 
  1.25 
  mm.; 
  diameter 
  of 
  meso- 
  

   pores, 
  0.10 
  mm. 
  

  

  Affinities. 
  — 
  The 
  mesopores 
  seem 
  

   to 
  be 
  parietal. 
  Their 
  exterior 
  dia- 
  

   meter 
  is 
  perceptibly 
  equal 
  to 
  that 
  

   of 
  the 
  peristomes, 
  

   found 
  were 
  broken 
  and 
  difficult 
  to 
  

   interpret. 
  The 
  tubes 
  are 
  cylindrical. 
  

  

  The 
  species 
  differs 
  from 
  Tretocycloecia 
  densa 
  by 
  its 
  very 
  numerous 
  

   mesopores 
  as 
  large 
  as 
  the 
  peristomes. 
  

  

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

   (rare) 
  . 
  

  

  Cotypes 
  — 
  Cat. 
  No. 
  69939, 
  U.S.N.M. 
  

  

  TRETOCYCLOECIA 
  DENSA, 
  new 
  species 
  

  

  Plate 
  16, 
  figs. 
  9-14 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  small, 
  cylindrical, 
  bifurcated. 
  

   The 
  orifices 
  are 
  orbicular; 
  the 
  peristomes 
  are 
  thin, 
  salient, 
  close 
  

   together, 
  sometimes 
  adjacent, 
  arranged 
  in 
  quincunx. 
  The 
  mesopores 
  

   are 
  little 
  numerous, 
  small, 
  irregularly 
  distributed 
  around 
  the 
  aper- 
  

  

  Thf 
  O 
  vi 
  rolls 
  Fig. 
  42.— 
  Tretocycloecia 
  densa, 
  new 
  species. 
  A, 
  

   B. 
  Longitudinal 
  sections, 
  X 
  16. 
  The 
  meso- 
  

   pores 
  are 
  almost 
  closed 
  by 
  thick 
  tissue. 
  Lower 
  

   Cretaceous 
  (Aptian): 
  Faringdon, 
  England 
  

  

  