﻿CYCL.OSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLEB 
  

  

  35 
  

  

  SPINOPORA 
  NEOCOMIENSIS, 
  new 
  species 
  

  

  Plate 
  26, 
  figs. 
  6, 
  7 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  subcylindrical, 
  hollow, 
  branched. 
  

   The 
  orifices 
  are 
  polygonal, 
  small, 
  arranged 
  in 
  quincunx, 
  separated 
  by 
  

   very 
  salient 
  tuberosities. 
  The 
  zoarial 
  tubercles 
  are 
  very 
  salient, 
  

   smooth, 
  much 
  scattered, 
  arranged 
  in 
  quincunx. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifices, 
  0.16 
  mm.; 
  diameter 
  of 
  zoa- 
  

   rium, 
  4 
  mm. 
  

  

  Affinities. 
  — 
  The 
  zoarial 
  form 
  in 
  this 
  species 
  is 
  very 
  different 
  from 
  

   that 
  of 
  the 
  genotype, 
  but 
  the 
  external 
  characters 
  are 
  absolutely 
  iden- 
  

   tical. 
  We 
  have 
  not 
  been 
  able 
  to 
  make 
  sections. 
  

  

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

   Switzerland. 
  

  

  Cotype.— 
  Cat. 
  No. 
  698S0, 
  U.S.N.M. 
  

  

  Division 
  OVICELLATA 
  

  

  Subdivision 
  Parallelata 
  Waters, 
  1887 
  

   Family 
  MECYNOECIIDAE 
  Canu, 
  1918 
  

  

  Genus 
  MECYNOECIA 
  Canu, 
  1918 
  

  

  MECYNOECIA 
  ICAUNENSIS 
  D'Orbigny, 
  1850 
  

  

  Plate 
  1, 
  figs. 
  1-4 
  

  

  1850. 
  Entalophora 
  icaunensis 
  D'Orbigny, 
  Prodrome 
  de 
  Paleontologie, 
  vol. 
  2, 
  

  

  p. 
  87. 
  

   1853. 
  Entalophora 
  icaunensis 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  

  

  Cretace, 
  vol. 
  5, 
  p. 
  781, 
  pi. 
  616, 
  figs. 
  12-14. 
  

  

  Measurements. 
  — 
  

  

  M. 
  probos- 
  

   cidea 
  

  

  Diameter 
  of 
  aperture 
  

  

  Diameter 
  of 
  peristome.. 
  

   Distance 
  of 
  peristomes 
  .. 
  

   Separation 
  of 
  peristomes. 
  

  

  Mm. 
  

   0.16 
  

  

  .16-.20 
  

   1. 
  20-1.40 
  

  

  . 
  30-.40 
  

  

  Affinities. 
  — 
  This 
  species 
  was 
  identified 
  by 
  Pergens, 
  in 
  1889 
  with 
  

   Entalophora 
  proooscidea 
  Milne-Edwards, 
  1838, 
  and 
  by 
  Gregory, 
  1899, 
  

   with 
  Entalophora 
  virgula 
  Hagenow, 
  1840. 
  According 
  to 
  these 
  authors, 
  

   it 
  begins 
  in 
  the 
  Neocomian 
  and 
  still 
  exists 
  in 
  the 
  recent 
  seas. 
  The 
  

   Neocomian 
  species 
  appears 
  to 
  us 
  distinct 
  and 
  to 
  differ 
  from 
  the 
  recent 
  

   species 
  in 
  its 
  more 
  crowded 
  and 
  smoother 
  tubes. 
  We 
  figure 
  a 
  few 
  

   variations. 
  The 
  structure 
  is 
  identical 
  with 
  that 
  of 
  the 
  recent 
  species 
  

   and 
  of 
  some 
  Tertiary 
  specimens 
  of 
  which 
  we 
  have 
  published 
  sections 
  

  

  