﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  27 
  

  

  Our 
  section 
  does 
  not 
  indicate 
  the 
  enveloping 
  false 
  lamellae, 
  but 
  

   on 
  certain 
  specimens 
  not 
  sectioned 
  these 
  are 
  quite 
  visible. 
  

  

  The 
  zoarial 
  form 
  characterizes 
  this 
  species 
  very 
  well 
  exteriorly. 
  

  

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

   Switzerland 
  (rare) 
  . 
  

  

  Cotypes.— 
  Cat. 
  No. 
  69868, 
  U.S.N.M. 
  

  

  CERIOPORA 
  LOBIFERA, 
  new 
  species 
  

  

  Plate 
  23, 
  figs. 
  11-17 
  

  

  Description. 
  — 
  The 
  z 
  o 
  a 
  r 
  i 
  - 
  

   urn 
  is 
  large, 
  free, 
  subcylin- 
  

   drical; 
  it 
  bears 
  lateral 
  lobes 
  

   more 
  or 
  less 
  developed. 
  The 
  

   zoarial 
  surface 
  sometimes 
  ex- 
  

   hibits 
  small 
  tuberosities. 
  

   The 
  tubes 
  are 
  thin; 
  the 
  aper- 
  

   tures 
  are 
  polygonal 
  and 
  very 
  

   irregular. 
  

  

  Measurements. 
  — 
  Diameter 
  

   of 
  aperture, 
  0.12 
  mm.; 
  di- 
  

   ameter 
  of 
  zoarium, 
  10 
  mm. 
  ; 
  

   length 
  of 
  large 
  fragments, 
  

   25 
  mm. 
  

  

  Structure. 
  — 
  The 
  base 
  is 
  a 
  

   somewhat 
  expanded 
  disk 
  (fig. 
  

   13) 
  ; 
  the 
  inferior 
  part 
  (fig. 
  14) 
  

   shows 
  the 
  characteristic 
  loz- 
  

   enge-shaped 
  tubes 
  recurved 
  

   at 
  their 
  extremity, 
  radiating 
  

   around 
  the 
  ancestrula. 
  In 
  

   thin 
  sections 
  the 
  tubes 
  are 
  

   cylindrical, 
  recurved 
  at 
  their 
  

   extremity. 
  The 
  walls 
  are 
  

   thin 
  and 
  formed 
  of 
  a 
  single 
  

   row 
  of 
  small 
  vesicles. 
  The 
  

   zonal 
  lines 
  are 
  widely 
  sepa- 
  

   rated 
  and 
  formed 
  by 
  the 
  thickening 
  of 
  parietal 
  vesicles. 
  The 
  dia- 
  

   phragms 
  are 
  almost 
  always 
  placed 
  on 
  the 
  zonal 
  lines. 
  The 
  latter 
  are 
  

   transformed 
  into 
  basal 
  lamellae 
  in 
  the 
  inferior 
  part 
  of 
  the 
  colonies. 
  

  

  The 
  arborescent 
  form 
  of 
  this 
  species 
  clearly 
  distinguishes 
  it 
  from 
  

   all 
  other 
  species 
  from 
  the 
  same 
  locality. 
  

  

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

   Switzerland 
  (common) 
  . 
  

  

  Cotypes.— 
  Cat. 
  No. 
  69869, 
  U.S.N.M. 
  

  

  Fig. 
  12.— 
  Caiopora 
  lobifcra, 
  new 
  species. 
  A 
  meridian 
  sec- 
  

   tion, 
  X 
  16. 
  The 
  zonal 
  lines 
  are 
  transformed 
  sometimes 
  

   into 
  basal 
  lamellae. 
  Lower 
  Cretaceous 
  (Valangian): 
  

   Sainte-Croix, 
  Switzerland 
  

  

  