﻿art. 
  21 
  CYCLOSTOMATOUS 
  BRYOZOA— 
  CANU 
  AND 
  BASSLER 
  47 
  

  

  arranged 
  in 
  quincunx. 
  The 
  zone 
  of 
  growth 
  is 
  rather 
  broad 
  and 
  

   formed 
  of 
  three 
  or 
  four 
  series 
  of 
  tubes. 
  The 
  ovicell 
  is 
  suborbicular, 
  

   little 
  convex, 
  smooth. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.12 
  mm.; 
  diameter 
  of 
  tubes, 
  

   0.22 
  mm. 
  ; 
  distance 
  of 
  peristomes, 
  0.64 
  mm. 
  ; 
  separation 
  of 
  peristomes, 
  

   0.52-0.60 
  mm. 
  

  

  Affinities. 
  — 
  The 
  superb 
  figured 
  specimen 
  measures 
  5 
  centimeters 
  in 
  

   length. 
  Some 
  free 
  broken 
  expansions 
  show 
  the 
  median 
  lamella 
  and 
  

   consequently 
  the 
  identity 
  with 
  the 
  other 
  species 
  of 
  the 
  genus. 
  

  

  This 
  species 
  differs 
  from 
  Trigonoecia 
  Jiaimeana 
  De 
  Loriol, 
  1868, 
  

   which 
  exhibits 
  also 
  large 
  multilamellar 
  specimens, 
  in 
  the 
  presence 
  of 
  

   salient 
  threads, 
  in 
  the 
  absence 
  of 
  overlapping 
  wrinkles, 
  and 
  in 
  the 
  

   very 
  different 
  form 
  of 
  its 
  ovicell. 
  

  

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

   Switzerland 
  (very 
  rare) 
  . 
  

  

  Hole-type. 
  — 
  Canu 
  collection. 
  

  

  NEMATIFERA 
  RETICULOIDES, 
  new 
  species 
  

  

  Plate 
  4, 
  figs. 
  8-11 
  

  

  Description. 
  — 
  The 
  zoarium 
  is 
  free, 
  cylindrical, 
  bifurcated, 
  or 
  reticu- 
  

   late. 
  The 
  tubes 
  are 
  distinct, 
  flat, 
  separated 
  by 
  a 
  salient 
  thread, 
  

   forming 
  pseudofacettes 
  when 
  they 
  are 
  short. 
  The 
  peristomes 
  are 
  

   orbicular, 
  salient, 
  thick, 
  arranged 
  in 
  Peripora, 
  that 
  is 
  to 
  say, 
  in 
  groups 
  

   of 
  closely 
  arranged 
  transverse 
  rows. 
  The 
  zone 
  of 
  growth 
  is 
  a 
  cone, 
  

   little 
  elevated. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.10 
  mm.; 
  diameter 
  of 
  zooe- 
  

   cium, 
  0.20-0.24 
  mm.; 
  distance 
  of 
  peristomes, 
  0.40-0.64-0.80 
  mm.; 
  

   separation 
  of 
  peristomes, 
  0.64 
  mm. 
  

  

  Affinities. 
  — 
  The 
  peristomes 
  are 
  rarely 
  arranged 
  in 
  quincunx 
  and 
  

   their 
  distance 
  is 
  about 
  0.64 
  mm. 
  They 
  are 
  somewhat 
  salient 
  and 
  

   adjacent 
  when 
  they 
  are 
  arranged 
  in 
  transverse 
  lines; 
  with 
  weather- 
  

   ing 
  they 
  are 
  no 
  longer 
  orbicular 
  and 
  their 
  form 
  is 
  close 
  to 
  that 
  of 
  the 
  

   peristomes 
  in 
  the 
  Eleidae, 
  but 
  they 
  never 
  have 
  opercula. 
  The 
  dis- 
  

   tance 
  between 
  the 
  groups 
  of 
  transverse 
  lines 
  is 
  from 
  0.80 
  to 
  1.00 
  mm. 
  

  

  This 
  species 
  differs 
  from 
  Nematifera 
  reticulata 
  D'Orbigny, 
  1853, 
  in 
  

   its 
  smaller 
  micrometric 
  dimensions, 
  in 
  the 
  arrangement 
  of 
  the 
  peri- 
  

   stomes 
  in 
  the 
  Peripora 
  form, 
  and 
  in 
  the 
  cylindrical 
  zoarium. 
  It 
  

   differs 
  from 
  Nematifera 
  acuta 
  D'Orbigny, 
  1853, 
  in 
  the 
  oral 
  dimensions 
  

   and 
  in 
  the 
  cylindrical 
  and 
  not 
  lamellar 
  zoarium. 
  The 
  transverse 
  

   section 
  shows 
  that 
  the 
  zoarium 
  is 
  sometimes 
  a 
  little 
  compressed. 
  

  

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

   Switzerland 
  (rare). 
  

  

  Coty 
  pes. 
  —Cat. 
  No. 
  69896, 
  U.S.N.M. 
  

  

  