﻿36 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  in 
  1920. 
  The 
  transverse 
  section 
  especially 
  is 
  puzzling 
  and 
  we 
  can 
  

   not 
  explain 
  its 
  structure 
  because 
  the 
  tubes 
  in 
  it 
  are 
  not 
  rounded. 
  

   This 
  structure 
  is 
  peculiar 
  to 
  this 
  group, 
  and 
  it 
  is 
  little 
  probable 
  that 
  

   all 
  the 
  species 
  which 
  we 
  have 
  cited 
  as 
  belonging 
  to 
  this 
  genus, 
  

   because 
  of 
  the 
  nature 
  of 
  the 
  ovicell, 
  have 
  an 
  identical 
  structure. 
  

  

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

   Switzerland, 
  and 
  Censea 
  (Doubs), 
  France. 
  

  

  Plesiotyp'e— 
  Cat. 
  No. 
  69881, 
  U.S.N.M. 
  

  

  MECYNOECIA 
  (SPIROPORA) 
  VERTICILLATA 
  

   Goldfuss, 
  1827 
  

  

  1850. 
  Spiropora 
  neocomiensis 
  D'Orbigny, 
  

   Paleontologie 
  francaise, 
  Terrain 
  

   Cretace, 
  vol. 
  5, 
  p. 
  708, 
  pi. 
  742, 
  

   figs. 
  1, 
  2. 
  

  

  1865. 
  Spiropora 
  verticillata 
  Beissel, 
  tJeber 
  

   die 
  Bryozoen 
  der 
  Aachener 
  

   Kreidebildung, 
  Naturku 
  n 
  d 
  i 
  g 
  e 
  

   Verhandelingen 
  Hollandsche 
  

   Maatschappij 
  der 
  Weltenschap- 
  

   pen 
  te 
  Haarlem, 
  ser. 
  2, 
  vol. 
  22, 
  p. 
  

   70, 
  pi. 
  8, 
  figs. 
  91-93. 
  

  

  1869. 
  Spiropora 
  neocomiensis 
  De 
  Loriol, 
  

   Monographie 
  de 
  l'etage 
  Urgonien 
  

   de 
  Landeron, 
  Memoires 
  de 
  la 
  

   Society 
  helvetique 
  des 
  Sciences 
  

   naturelles, 
  vol. 
  23, 
  p. 
  37, 
  pi. 
  2, 
  

   fig. 
  18. 
  

  

  1909. 
  Spiropora 
  verticillata 
  Gregory, 
  

   Catalogue 
  of 
  the 
  C 
  r 
  etace 
  ous 
  

   Bryozoa 
  in 
  the 
  British 
  Museum, 
  

   vol. 
  1, 
  p. 
  256, 
  pi. 
  11, 
  fig. 
  5. 
  (Bib- 
  

   liography 
  and 
  geological 
  distri- 
  

   bution.) 
  

  

  1922. 
  Mecynoecia 
  ? 
  verticillata 
  Canu 
  and 
  

   Bassler, 
  Studies 
  on 
  the 
  Cyclo- 
  

   stomatous 
  Bryozoa, 
  Proc. 
  U. 
  S. 
  

   National 
  Museum, 
  vol. 
  61, 
  p. 
  13, 
  

   pi. 
  1, 
  figs. 
  16, 
  17. 
  

  

  fig. 
  i7. 
  -Mecynoecia 
  kaunemis 
  D'Orbigny, 
  1850. 
  Measurements. 
  — 
  Diameter 
  of 
  peri- 
  

  

  A-B. 
  Transverse 
  and 
  longitudinal 
  sections, 
  .. 
  . 
  

  

  X 
  16. 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte- 
  Stome, 
  0.20-0.24 
  mm.; 
  distance 
  OI 
  

  

  croix, 
  Switzerland 
  verticells, 
  0.60-0.90 
  mm. 
  The 
  

  

  measurements 
  are 
  identical 
  with 
  specimens 
  from 
  the 
  French 
  Conia- 
  

   cian. 
  In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  cylindrical, 
  with 
  regular 
  

   peripheral 
  gemmation. 
  

  

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

   zerland, 
  etc. 
  

  

  