﻿72 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  over 
  with 
  irregular 
  lamellae 
  with 
  open 
  dimorphic 
  zooecia. 
  The 
  nor- 
  

   mal 
  aspect 
  is 
  that 
  which 
  shows 
  salient 
  groups 
  of 
  large 
  zooecia 
  sur- 
  

   rounded 
  by 
  variable 
  zones 
  of 
  small 
  zooecia 
  with 
  facettes; 
  these 
  zones 
  

   may 
  become 
  very 
  large. 
  

  

  A 
  longitudinal 
  section 
  taken 
  at 
  the 
  extremity 
  of 
  a 
  large 
  branch 
  

   shows 
  the 
  tubes 
  expanded 
  and 
  recurved 
  at 
  their 
  extremity, 
  with 
  

   axial 
  gemmation 
  around 
  a 
  large 
  central 
  ramified 
  tube. 
  The 
  small 
  

   tubes 
  are 
  grouped 
  in 
  special 
  zones. 
  The 
  walls 
  of 
  the 
  tubes 
  are 
  

   moniliform 
  in 
  their 
  recurved 
  parts. 
  

  

  A 
  fragment 
  which 
  exteriorily 
  appeared 
  regularly 
  branched 
  showed 
  

   in 
  longitudinal 
  section 
  the 
  union 
  of 
  two 
  fragments 
  of 
  different 
  

   origin. 
  

  

  Finally, 
  a 
  meridian 
  section 
  in 
  a 
  large 
  irregular 
  zoarium 
  shows 
  an 
  

   extreme 
  complication 
  occasioned 
  by 
  the 
  multiplicity 
  of 
  the 
  envelop- 
  

   ing 
  lamellae. 
  

  

  