﻿The 
  Anatomy 
  of 
  the 
  Female 
  Genital 
  Tract 
  of 
  the 
  Pupipara 
  etc. 
  33 
  

  

  Figures 
  13 
  and 
  14 
  represent 
  two 
  cross-sections 
  of 
  the 
  distal 
  tip 
  of 
  

   the 
  ovary, 
  Fig. 
  13 
  being 
  slightly 
  proximad 
  of 
  Fig. 
  14. 
  In 
  both 
  we 
  

   see 
  the 
  outer 
  muscular 
  layer 
  surrounding 
  the 
  connective-tissue 
  within: 
  

   Fig. 
  13 
  shows 
  the 
  distal 
  termini 
  of 
  the 
  ovarioles 
  [ovar). 
  Fig. 
  14, 
  being 
  

   just 
  distad 
  of 
  these 
  termini 
  and 
  not 
  containing 
  them. 
  The 
  peritoneal 
  

   covering 
  of 
  the 
  separate 
  ovarioles 
  is 
  closely 
  applied 
  to 
  those 
  follicles 
  

   which 
  contain 
  large 
  ova 
  (PI. 
  III, 
  Fig. 
  11 
  in.peri.cov). 
  This 
  is 
  not 
  

   the 
  ease, 
  however, 
  at 
  the 
  narrow 
  necks 
  which 
  eonnect 
  the 
  follicles, 
  

   where 
  it 
  passes 
  directly 
  from 
  one 
  follicle 
  to 
  the 
  other. 
  In 
  ovarioles 
  

   containing 
  very 
  small 
  ova 
  their 
  peritoneal 
  coverings 
  are 
  but 
  loosely 
  

   applied 
  to 
  the 
  entire 
  structure 
  (PL 
  III, 
  Figs 
  12 
  in.peri.cov). 
  The 
  peri- 
  

   toneal 
  covering 
  of 
  the 
  ovarioles 
  often 
  extends 
  below 
  the 
  largest 
  

   follicle 
  toward 
  the 
  oviduct 
  where 
  they 
  terminate 
  abruptly 
  and 
  freely. 
  

   The 
  actual 
  condition 
  of 
  this 
  end 
  of 
  them 
  differs 
  very 
  greatly 
  in 
  

   different 
  cases. 
  In 
  the 
  ovary 
  represented 
  in 
  Fig. 
  12, 
  the 
  follicles 
  being 
  

   extremely 
  small, 
  the 
  inner 
  peritoneal 
  membrane 
  is 
  seen 
  extending 
  far 
  

   below 
  each 
  ovariole. 
  It 
  consists 
  of 
  a 
  broad 
  band 
  of 
  connective 
  tissue 
  

   which 
  extends 
  from 
  the 
  lower 
  end 
  of 
  the 
  ovarioles 
  to 
  the 
  beginning 
  

   of 
  the 
  oviduct 
  and 
  there 
  ends 
  abruptly; 
  it 
  contains 
  a 
  few 
  scattered 
  

   cells 
  [dis.fol.ee) 
  which 
  represent 
  the 
  remains 
  of 
  a 
  disintegrated 
  follicle 
  

   which 
  has 
  discharged 
  its 
  ovum. 
  

  

  In 
  large 
  ovaries 
  the 
  lower 
  end 
  of 
  the 
  peritoneal 
  covering 
  of 
  the 
  

   separate 
  ovarioles 
  is 
  much 
  less 
  noticeable. 
  Often, 
  as 
  in 
  both 
  ovaries 
  

   represented 
  in 
  Fig. 
  11, 
  it 
  does 
  not 
  extend 
  at 
  all 
  below 
  the 
  largest 
  

   follicle 
  in 
  each 
  ovary, 
  but 
  simply 
  forms 
  a 
  covering 
  around 
  its 
  lower 
  

   end 
  in 
  all 
  respects 
  like 
  that 
  at 
  its 
  sides. 
  When 
  a 
  ripe 
  ovum 
  is 
  

   extruded 
  the 
  peritoneal 
  membrane 
  covering 
  its 
  follicle 
  is 
  ruptured. 
  

  

  It 
  will 
  be 
  interesting 
  now 
  to 
  compare 
  the 
  peritoneal 
  covering 
  of 
  

   the 
  ovary 
  of 
  Melophagus 
  with 
  that 
  of 
  other 
  insects. 
  In 
  the 
  majority 
  

   of 
  insects 
  we 
  find 
  that 
  it 
  consists 
  of 
  a 
  more 
  or 
  less 
  closely 
  woven 
  

   membrane 
  of 
  fibrous 
  connective-tissue 
  which 
  surrounds 
  each 
  ovariole: 
  

   imbedded 
  in 
  it 
  are 
  often 
  striated, 
  branched 
  muscle-fibres, 
  nerves 
  

   and 
  tracheae. 
  There 
  are, 
  however, 
  the 
  greatest 
  differences 
  in 
  the 
  

   actual 
  extent 
  of 
  the 
  peritoneal 
  membrane 
  in 
  different 
  insects. 
  It 
  may 
  

   be 
  entirely 
  wanting, 
  as, 
  according 
  to 
  Brandt 
  (2, 
  p. 
  3), 
  it 
  is 
  in 
  Perla, 
  

   Nemura, 
  Baetis, 
  Coccus 
  and 
  the 
  viviparous 
  Aphids. 
  In 
  the 
  dicket 
  

   (Gryllus) 
  it 
  is 
  present, 
  but 
  feebly 
  developed, 
  and 
  consists 
  of 
  long, 
  

   thin, 
  net-like, 
  anastomosing 
  connective-tissue 
  threads, 
  which 
  are 
  spun 
  

   around 
  and 
  among 
  the 
  numerous 
  ovarioles. 
  They 
  do 
  not 
  form 
  a 
  

   membrane, 
  however, 
  about 
  each 
  separate 
  ovariole, 
  but 
  at 
  the 
  outer 
  

  

  Zeitschrift 
  f. 
  wissensch. 
  Zoologie. 
  LXVI. 
  Bd. 
  3 
  

  

  