﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLEE 
  

  

  31 
  

  

  Structure. 
  — 
  As 
  in 
  the 
  other 
  Cerioporas 
  from 
  Sainte-Croix, 
  the 
  exte- 
  

   rior 
  aspect 
  of 
  this 
  species 
  is 
  deceiving, 
  for 
  in 
  longitudinal 
  sections 
  the 
  

   subcolonies 
  are 
  not 
  complete 
  and 
  have 
  a 
  basal 
  lamella 
  only 
  at 
  the 
  

   periphery 
  of 
  the 
  colony. 
  There 
  are 
  no 
  zonal 
  lines, 
  as 
  in 
  Ceriopora, 
  

   but 
  instead 
  imaginary 
  concentric 
  lines 
  (potential) 
  uniting 
  at 
  the 
  

   basal 
  lamella 
  and 
  marking 
  the 
  zooecial 
  deformations 
  in 
  a 
  manner 
  

   that 
  each 
  subcolony 
  seems 
  to 
  have 
  a 
  certain 
  autonomy. 
  This 
  differ- 
  

   ence 
  of 
  structure 
  from 
  Ceriopora 
  justifies 
  the 
  maintenance 
  of 
  the 
  

   Defranciopora 
  Hamm, 
  1880. 
  Many 
  of 
  the 
  diaphragms 
  bear 
  two 
  tubes. 
  

   The. 
  zooecial 
  walls 
  are 
  moniliform 
  and 
  much 
  expanded 
  at 
  their 
  

   extremity; 
  the 
  vesicles 
  are 
  very 
  small. 
  

  

  Fig. 
  16.— 
  Defranciopora 
  neocomiensis, 
  new 
  species. 
  Meridian 
  section 
  through 
  a 
  characteristic 
  specimen 
  

   X 
  16, 
  with 
  potential 
  zonal 
  lines. 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  Switzerland 
  

  

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

   Switzerland 
  (rare). 
  

  

  Coty 
  pes. 
  —Cat. 
  No. 
  69874, 
  U.S.N. 
  M. 
  

  

  Genus 
  NEUROPORA 
  Bronn, 
  1825 
  

  

  1825. 
  Neuropora 
  Bronn. 
  Proposed 
  to 
  replace 
  Chrysaora 
  Lamouroux, 
  preoccu- 
  

   pied 
  by 
  P<§ron. 
  

  

  The 
  zoarium 
  is 
  free, 
  more 
  or 
  less 
  claviform 
  or 
  arborescent. 
  The 
  

   surface 
  is 
  traversed 
  by 
  irregular 
  veinules 
  radiating 
  from 
  a 
  special 
  

   center. 
  The 
  orifices 
  are 
  ornamented 
  with 
  short 
  visors. 
  The 
  tubes 
  

  

  