﻿a 
  in-. 
  .1 
  CYCIiOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  19 
  

  

  small 
  cones 
  replace 
  a 
  consolidated 
  tube. 
  This 
  is 
  not 
  the 
  case 
  here. 
  

   More 
  material 
  is 
  necessary 
  in 
  order 
  to 
  establish 
  the 
  nature 
  of 
  the 
  

   genus 
  Acanthopora. 
  

  

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

   Switzerland. 
  

  

  Holotype.—C&t. 
  No. 
  69859, 
  U.S.N.M. 
  

  

  Genus 
  SEMINODICRESCIS 
  D'Orbigny, 
  1854 
  

  

  SEMINODICRESCIS 
  NODOSA 
  D'Orbigny, 
  1854 
  

  

  Plate 
  22, 
  fig. 
  1 
  

  

  1854. 
  Seminodicrescis 
  nodosa 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  Cre- 
  

   tace, 
  vol. 
  5. 
  p. 
  1067, 
  pi. 
  800, 
  figs. 
  12-14. 
  

  

  Our 
  zoarium 
  is 
  smaller 
  than 
  that 
  figured 
  by 
  D'Orbigny, 
  but 
  the 
  

   aspect 
  is 
  very 
  much 
  the 
  same. 
  It 
  is 
  hollow 
  and 
  thin 
  at 
  the 
  two 
  

   extremities. 
  The 
  nodosities 
  do 
  not 
  present 
  any 
  particular 
  character 
  

   and 
  correspond 
  to 
  the 
  mammillosites 
  of 
  many 
  other 
  species 
  belong- 
  

   ing 
  to 
  the 
  genus 
  Multicrescis 
  D'Orbigny, 
  1854. 
  As 
  we 
  have 
  not 
  

   been 
  able 
  to 
  make 
  any 
  section, 
  we 
  maintain 
  D'Orbigny's 
  name. 
  

  

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

  

  Geologic 
  distribution. 
  — 
  Lower 
  Cretaceous 
  (Aptian), 
  Saint-Dizier 
  

   (Haute-Marne), 
  and 
  Les 
  Croutes 
  (Aube), 
  France 
  (D'Orbigny). 
  

  

  Plesiotype.— 
  -Cat. 
  No. 
  69S61, 
  U.S.N.M. 
  

  

  Genus 
  CERIOPORA 
  Goldfuss, 
  1827 
  

  

  and 
  

  

  Genus 
  REPTOMULTICAVA 
  D'Orbigny, 
  1854 
  

  

  In 
  Ceriopora 
  the 
  colonies 
  are 
  unilamellar, 
  more 
  or 
  less 
  massive 
  or 
  

   lobed, 
  and 
  formed 
  of 
  cylindrical 
  tubes 
  without 
  peristomes 
  and 
  with 
  

   peripheral 
  [gemmation. 
  In 
  Reptornulticava 
  the 
  zoaria 
  are 
  multi- 
  

   lamellar. 
  

  

  The 
  structure 
  of 
  these 
  genera 
  is 
  not 
  as 
  simple 
  as 
  their 
  diagnoses 
  

   would 
  indicate. 
  In 
  thin 
  sections 
  they 
  present 
  important 
  peculiari- 
  

   ties 
  for 
  observation. 
  

  

  Zonal 
  lines. 
  — 
  In 
  longitudinal 
  or 
  meridian 
  sections 
  the 
  zonal 
  lines 
  

   are 
  curved 
  concentric 
  regular 
  bands 
  of 
  very 
  little 
  width. 
  They 
  are 
  

   closer 
  together 
  at 
  the 
  summit 
  of 
  the 
  colony 
  than 
  at 
  the 
  base. 
  They 
  

   do 
  not 
  interrupt 
  the 
  tubes 
  as 
  the 
  diaphragms. 
  They 
  are 
  transformed 
  

   frequently 
  in 
  a 
  part 
  of 
  their 
  length 
  into 
  basal 
  lamellae 
  supporting 
  

   not 
  subcolonies 
  but 
  series 
  of 
  tubes 
  differently 
  oriented 
  (Ceriopora 
  

   ovoidea, 
  C. 
  solida, 
  C. 
  lobifera) 
  . 
  This 
  phenomenon 
  is 
  more 
  frequent 
  in 
  

   the 
  lateral 
  portions 
  of 
  the 
  colonies, 
  where 
  it 
  is 
  manifested 
  externally 
  

   by 
  the 
  lamellae 
  appearing 
  entirely 
  surrounding 
  the 
  colony 
  (Cerio- 
  

   pora) 
  or 
  superposed 
  (Defranciopora) 
  . 
  

  

  