﻿38 
  

  

  PROCEEDINGS 
  OP 
  THE 
  NATIONAL. 
  MUSEUM 
  

  

  the 
  tubes. 
  The 
  distance 
  of 
  the 
  peristomes 
  is 
  quite 
  variable. 
  In 
  

   certain 
  portions 
  the 
  peristomes 
  are 
  very 
  close 
  together 
  and 
  in 
  other 
  

   places 
  they 
  are 
  grouped 
  in 
  transverse 
  rows. 
  

  

  The 
  ovicell, 
  in 
  its 
  complete 
  form, 
  is 
  a 
  large 
  pyriform 
  quite 
  salient 
  

   sack, 
  very 
  convex, 
  perfectly 
  symmetrical, 
  and 
  terminated 
  by 
  a 
  very 
  

   small 
  oeciostome. 
  But 
  it 
  often 
  presents 
  forms 
  less 
  symmetrical 
  in 
  

  

  shape. 
  However, 
  it 
  is 
  very 
  rare 
  that 
  on 
  the 
  same 
  specimen 
  of 
  

   cyclostomatous 
  bryozoan 
  all 
  the 
  ovicclls 
  are 
  identical 
  in 
  shape. 
  

   Irregularity 
  is 
  the 
  rule. 
  

  

  In 
  longitudinal 
  section 
  the 
  tubes 
  are 
  cylindrical, 
  long, 
  with 
  tri- 
  

   parietal 
  gemmation 
  on 
  the 
  basal 
  lamella 
  and 
  narrowed 
  at 
  their 
  base 
  

  

  