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  Explanation 
  of 
  Plate. 
  

  

  b. 
  Muscles 
  between 
  the 
  apical 
  edge 
  of 
  pseudotegmen 
  

   and 
  apex 
  of 
  the 
  tegminal 
  strut 
  (fig. 
  2). 
  Retractor 
  

   of 
  tegmen 
  (figs. 
  7, 
  8). 
  

  

  c. 
  Retractor 
  of 
  the 
  median 
  lobe, 
  

  

  d. 
  Protractor 
  of 
  the 
  median 
  lobe. 
  

  

  e. 
  Retractor 
  of 
  the 
  internal 
  sac. 
  

  

  e^, 
  e^, 
  e?. 
  Areas 
  to 
  which 
  retractor 
  muscles 
  of 
  internal 
  

   sac 
  are 
  attached. 
  

  

  /. 
  Apical 
  edge 
  of 
  pseudotegmen. 
  

  

  g. 
  iSclerite 
  at 
  base 
  of 
  the 
  internal 
  sac 
  (fig. 
  4). 
  Pro- 
  

   tractor 
  of 
  tegmen 
  (figs. 
  7, 
  8). 
  

  

  k. 
  Muscles 
  from 
  the 
  lesser 
  spiculum 
  to 
  the 
  walls 
  of 
  

   rectum. 
  

  

  I. 
  Mu.scles 
  from 
  lesser 
  spiculum 
  to 
  the 
  walls 
  of 
  rectum. 
  

  

  m. 
  Mviscles 
  from 
  lesser 
  spicidum 
  to 
  connecting 
  mem- 
  

   brane 
  im 
  1 
  . 
  

  

  n. 
  Muscles 
  from 
  apex 
  of 
  tegminal 
  strut 
  to 
  apex 
  of 
  

   median 
  struts. 
  

  

  