﻿CYCLOSTOMATOUS 
  BRYOZOA 
  CANU 
  AND 
  BASSLER 
  

  

  15 
  

  

  Measurements. 
  — 
  Diameter 
  of 
  apertures, 
  0.04 
  mm.; 
  diameter 
  of 
  

   mesopores, 
  0.03 
  mm.; 
  diameter 
  of 
  zoarium, 
  7 
  mm. 
  

  

  Structure. 
  — 
  The 
  meridian 
  section 
  shows 
  cylindrical 
  tubes 
  with 
  solid 
  

   thickened 
  walls. 
  The 
  lamellae 
  are 
  formed 
  by 
  orbicular 
  subcolonies 
  

   invisible 
  externally. 
  The 
  epithecal 
  lines 
  are 
  thin 
  and 
  rare. 
  The 
  

   basal 
  lamellae 
  are 
  thick. 
  The 
  mesopores 
  are 
  long 
  and 
  of 
  little 
  

   diameter; 
  they 
  are 
  only 
  visible 
  in 
  the 
  portions 
  where 
  the 
  subcolonies 
  

   are 
  cut 
  in 
  the 
  same 
  axis 
  as 
  their 
  initial 
  cell. 
  

  

  Affinities. 
  — 
  This 
  species 
  differs 
  from 
  Multicrescis 
  galaefera 
  in 
  its 
  

   still 
  smaller 
  micrometric 
  measurements 
  and 
  its 
  globular 
  and 
  smaller 
  

   zoarium. 
  

  

  Fig. 
  3.— 
  Genus 
  Multicrescis 
  D'Orbigny, 
  1852. 
  A, 
  B. 
  Multicrescis 
  landrioti 
  Michelin, 
  1841. 
  A. 
  Portion 
  

   of 
  a 
  meridian 
  section, 
  X 
  16, 
  showing 
  two 
  superposed 
  lamellae. 
  B. 
  Sketch, 
  X 
  30, 
  exhibiting 
  annular 
  

   structure 
  of 
  the 
  tubes. 
  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  Switzerland. 
  C. 
  Multicrescis 
  par- 
  

   vipora, 
  new 
  species. 
  Meridian 
  section, 
  X 
  16. 
  The 
  tubes 
  of 
  the 
  enveloping 
  lamellae 
  are 
  perpendicular 
  

   to 
  the 
  tubes 
  of 
  the 
  primitive 
  zoarium. 
  Each 
  lamella 
  is 
  formed 
  of 
  a 
  variable 
  number 
  of 
  subcolonies. 
  

   Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  Switzerland 
  

  

  It 
  differs 
  from 
  Rcptomulticava 
  f 
  wig 
  if 
  or 
  mis, 
  Gregory, 
  1909, 
  from 
  

   Faringdon, 
  England, 
  in 
  its 
  much 
  smaller 
  zoarium 
  and 
  in 
  the 
  

   presence 
  of 
  small 
  visors 
  on 
  the 
  tubes. 
  

  

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

   Switzerland 
  (rare). 
  

  

  Cotypes. 
  — 
  Cat. 
  No. 
  69855, 
  U.S.N.M., 
  and 
  Museum 
  Comparative 
  

   Zoology. 
  

  

  MULTICRESCIS 
  (?) 
  LANDRIOTI 
  Michelin, 
  1841 
  

  

  Plate 
  20, 
  figs. 
  12-15 
  

  

  1909. 
  Semimulticavea 
  landrioti 
  Gregory, 
  Catalogue 
  of 
  the 
  Cretaceous 
  Bryozoa 
  

   in 
  the 
  British 
  Museum, 
  vol. 
  2, 
  p. 
  242. 
  (Bibliography.) 
  

  

  