﻿30 
  

  

  H. 
  S. 
  Pratt. 
  

  

  has 
  tliree 
  or 
  four, 
  Blatta 
  has 
  ten, 
  Periplane 
  ta, 
  according 
  to 
  Wheeler 
  

   (21) 
  has 
  thirty 
  and 
  the 
  Lepidoptera, 
  according 
  to 
  Lubbock 
  have 
  from 
  

   twelve 
  to 
  one 
  hundred. 
  

  

  There 
  are 
  thus 
  in 
  tlie 
  ovary 
  of 
  Melophagus 
  bat 
  four 
  developing 
  

   ova 
  at 
  any 
  one 
  tiine. 
  two 
  in 
  each 
  ovariole, 
  and 
  in 
  the 
  two 
  ovaries 
  

   tliere 
  are 
  bat 
  eight 
  ova. 
  The 
  two 
  ovarioles 
  within 
  each 
  ovary, 
  and 
  

   also 
  the 
  two 
  ovaries 
  theniselves, 
  are 
  further 
  peculiar 
  in 
  being 
  very 
  

   dissimilar 
  in 
  size. 
  As 
  the 
  entire 
  embryonic 
  and 
  a 
  greater 
  portion 
  

   of 
  the 
  larval 
  growth 
  goes 
  on 
  within 
  the 
  uterus, 
  this 
  organ 
  naturally 
  

   retains 
  each 
  egg 
  within 
  it 
  a 
  long 
  tinie. 
  and 
  receives 
  the 
  ditTerent 
  

   eggs 
  from 
  the 
  ovaries 
  one 
  at 
  a 
  tinie 
  and 
  at 
  long 
  intervals, 
  probably 
  

   of 
  several 
  weeks. 
  The 
  two 
  ovaries 
  alternate 
  in 
  furnishing 
  the 
  next 
  

   egg. 
  and 
  within 
  each 
  ovary 
  the 
  two 
  ovarioles 
  alternate 
  in 
  perforraing 
  

  

  which 
  contains 
  it 
  will 
  be 
  niuch 
  larger 
  than 
  the 
  other 
  ovary. 
  Likewise 
  

   within 
  the 
  ovary 
  the 
  follicle 
  which 
  contains 
  this 
  ovura 
  will 
  be 
  niuch 
  

   larger 
  than 
  the 
  other 
  three 
  follicles. 
  These 
  facts 
  are 
  very 
  well 
  shown 
  

   in 
  the 
  plates. 
  In 
  Fig. 
  11, 
  in 
  the 
  smaller 
  ovary 
  (the 
  one 
  to 
  the 
  right 
  of 
  

   the 
  reader), 
  the 
  two 
  ovarioles 
  are 
  as 
  near 
  the 
  sanie 
  size 
  as 
  any 
  I 
  have 
  

   observed; 
  the 
  smaller 
  ovariole 
  [ovar 
  t 
  2] 
  having 
  a 
  length 
  of 
  0.17 
  mm, 
  the 
  

   larger 
  one 
  [ovar.l] 
  having 
  a 
  length 
  of 
  0,35 
  mm. 
  The 
  largest 
  follicle 
  in 
  

   this 
  ovary 
  [fol,2) 
  has 
  a 
  length 
  of 
  0.26 
  mm, 
  the 
  next 
  largest 
  (folA) 
  has 
  a 
  

   length 
  of 
  0.15 
  mm. 
  The 
  two 
  sinailest 
  follicles 
  (fol.6 
  and 
  fol.S) 
  do 
  

   not 
  difTer 
  niuch 
  in 
  length. 
  they 
  measuring 
  0,066 
  mm 
  and 
  0,05 
  mm 
  

   respectively. 
  In 
  the 
  larger 
  ovary 
  (the 
  one 
  to 
  the 
  left 
  of 
  the 
  reader) 
  

   the 
  ovariole 
  containing 
  the 
  largest 
  follicle 
  {ovar.l) 
  has 
  a 
  length 
  of 
  

   '».^T 
  mm, 
  the 
  smaller 
  ovariole 
  (ovar.2) 
  has 
  a 
  length 
  of 
  0,22 
  mm. 
  The 
  

   largest 
  follicle 
  (fohl) 
  in 
  this 
  ovary 
  has 
  a 
  length 
  of 
  0,77 
  mm, 
  the 
  next 
  

   largest 
  [fol.3) 
  has 
  a 
  length 
  of 
  0,16mm; 
  the 
  two 
  smallest 
  follicles 
  

  

  Textfig. 
  I. 
  

  

  this 
  duty. 
  The 
  accompanying 
  

   diagram 
  shows 
  the 
  order 
  in 
  which 
  

   the 
  eight 
  ova 
  in 
  the 
  four 
  ovarioles 
  

   leave 
  the 
  two 
  ovaries, 
  the 
  nume- 
  

   rals 
  indicating 
  the 
  order 
  of 
  suc- 
  

   cession. 
  The 
  result 
  of 
  this 
  ar- 
  

   rangement 
  is 
  that 
  there 
  is 
  always 
  

   one 
  ovum 
  of 
  the 
  eight 
  in 
  the 
  

   two 
  ovaries 
  mach 
  larger 
  than 
  the 
  

   others. 
  it 
  being 
  the 
  one 
  whose 
  

   tum 
  will 
  next 
  come 
  to 
  descend 
  

   into 
  the 
  uterus, 
  and 
  the 
  ovary 
  

  

  