﻿akt. 
  21 
  CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLEB 
  37 
  

  

  Genus 
  MICROECIA 
  Canu, 
  1918 
  

  

  MICROECIA 
  CORNUCOPIA 
  D'Orbigny, 
  1851 
  

  

  Plate 
  28, 
  figs. 
  5-7 
  

  

  1899. 
  Proboscina 
  cornucopia 
  Gregory, 
  Catalogue 
  of 
  Cretaceous 
  Bryozoa 
  in 
  the 
  

   British 
  Museum, 
  vol. 
  1, 
  p. 
  45, 
  pi. 
  3, 
  figs. 
  6, 
  9, 
  10; 
  pi. 
  4, 
  fig. 
  1. 
  (Bibli- 
  

   ography, 
  geological 
  distribution.) 
  

  

  Our 
  specimens 
  from 
  Faringdon 
  found 
  incrusting 
  shells 
  correspond 
  

   fairly 
  well 
  to 
  Gregory's 
  Figure 
  Qb. 
  They 
  do 
  not 
  exhibit 
  the 
  large 
  

   berenicoid 
  expansions 
  like 
  the 
  type 
  specimen, 
  but 
  they 
  have 
  the 
  

   same 
  small 
  dimensions. 
  

  

  A 
  specimen 
  from 
  Sainte-Croix 
  appearing 
  to 
  correspond 
  to 
  Figure 
  

   1, 
  Plate 
  4, 
  of 
  Gregory, 
  is 
  ovicelled 
  and 
  belongs 
  to 
  the 
  genus 
  Microecia. 
  

  

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

   Sainte-Croix 
  (Vaud), 
  Switzerland 
  (Valangian). 
  

  

  Plesiotype— 
  Cat. 
  No. 
  69882, 
  U.S.N.M. 
  

  

  Genus 
  TRIGONOECIA 
  Canu 
  and 
  Bassler, 
  1922 
  

  

  TRIGONOECIA 
  SEMOTA, 
  new 
  species 
  

  

  Plate 
  1, 
  fig. 
  5 
  

  

  Description. 
  — 
  The 
  zoarium 
  incrusts 
  shells; 
  it 
  is 
  suborbicular, 
  bere- 
  

   nicoid; 
  the 
  zone 
  of 
  growth 
  is 
  thin 
  and 
  irregular. 
  The 
  tubes 
  are 
  

   long, 
  cylindrical, 
  visible, 
  convex, 
  arched; 
  the 
  peristomes 
  are 
  thin, 
  

   orbicular 
  or 
  elliptical, 
  much 
  scattered 
  from 
  each 
  other. 
  The 
  ovicell 
  

   is 
  elongated 
  or 
  transverse, 
  symmetrical, 
  convex, 
  wrinkled 
  transversely; 
  

   the 
  oeciostome 
  is 
  small, 
  salient, 
  orbicular, 
  opening 
  on 
  the 
  same 
  plane 
  

   as 
  the 
  peristomes. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifice, 
  0.14 
  mm.; 
  diameter 
  of 
  peri- 
  

   stome, 
  0.16-0.18 
  mm.; 
  distance 
  of 
  peristomes, 
  0.48-0.64 
  mm.; 
  sepa- 
  

   ration 
  of 
  peristomes, 
  0.64-0.72 
  mm. 
  ; 
  diameter 
  of 
  oeciostome, 
  0.07 
  mm. 
  ; 
  

   diameter 
  of 
  zoarium, 
  5 
  mm. 
  

  

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

   zerland 
  (common). 
  

  

  Holotype.— 
  Cat. 
  No. 
  698S3, 
  U.S.N.M. 
  

  

  TRIGONOECIA 
  TUBULOSA 
  D'Orbigny, 
  1853 
  

  

  Plate 
  4, 
  figs. 
  13-15 
  

  

  1853. 
  Diastopora 
  tubulosa 
  D'Orbigny, 
  Paleontologie 
  francaise, 
  Terrain 
  Cr^tace 
  

   vol. 
  5, 
  p. 
  827, 
  pi. 
  635, 
  figs. 
  1-3. 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  orifices, 
  0.09 
  mm.; 
  diameter 
  of 
  tubes, 
  

   0.10 
  mm.; 
  distance 
  of 
  peristomes, 
  0.90 
  mm.; 
  separation 
  of 
  peristomes, 
  

   0.50 
  mm.; 
  diameter 
  of 
  peristome, 
  0.12-0.14 
  mm. 
  

  

  Structure. 
  — 
  The 
  tubes 
  become 
  dilated 
  in 
  their 
  free 
  terminal 
  por- 
  

   tion, 
  so 
  that 
  the 
  diameter 
  of 
  the 
  peristome 
  is 
  greater 
  than 
  that 
  of 
  

  

  