﻿CYCLOSTOMATOUS 
  BEYOZOA 
  CANU 
  AND 
  BASSLEB 
  

  

  41 
  

  

  the 
  same 
  fragment 
  of 
  frond 
  (figs. 
  2, 
  7); 
  the 
  tubes 
  cease 
  to 
  be 
  visible 
  

   and 
  the 
  peristomes 
  are 
  very 
  salient 
  (fig. 
  2) 
  . 
  The 
  latter 
  frequently 
  

   are 
  less 
  developed 
  (figs. 
  3, 
  4, 
  6) 
  and 
  the 
  superficial 
  aspect 
  is 
  totally 
  

   different. 
  In 
  some 
  very 
  rare 
  cases 
  they 
  become 
  almost 
  adjacent 
  

   (fig. 
  5.) 
  

  

  The 
  ovicell 
  shown 
  in 
  Figure 
  3 
  is 
  the 
  typical 
  and 
  perfect 
  form; 
  it 
  

   is 
  heart-shaped, 
  transverse, 
  convex, 
  smooth, 
  symmetrical, 
  and 
  its 
  

  

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  small 
  oeciostome 
  is 
  placed 
  in 
  the 
  median 
  axis; 
  but 
  regularity 
  and 
  

   symmetry 
  disappear 
  rather 
  easily 
  (fig. 
  6). 
  The 
  oeciostome 
  meas- 
  

   ures 
  0.10 
  mm. 
  and 
  the 
  oeciopore 
  0.06 
  mm. 
  

  

  The 
  zone 
  of 
  growth 
  is 
  short 
  but 
  very 
  thick 
  (figs. 
  2, 
  5). 
  

  

  Structure. 
  — 
  In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  long, 
  club-shaped, 
  

   much 
  expanded 
  at 
  their 
  extremity, 
  where, 
  in 
  consequence 
  of 
  the 
  

   closeness 
  of 
  the 
  peristomes, 
  they 
  appear 
  closed 
  by 
  pseudofacettes. 
  

  

  