﻿426 
  Dr. 
  H. 
  Eltringham 
  on 
  the 
  

  

  find 
  a 
  new 
  modification 
  in 
  the 
  fact 
  that 
  the 
  lobes 
  are 
  pro- 
  

   vided 
  on 
  their 
  inner 
  surface 
  with 
  a 
  membrane 
  which 
  can 
  

   be 
  distended, 
  probably 
  by 
  fluid 
  pressure. 
  On 
  this 
  mem- 
  

   brane 
  are 
  a 
  few 
  androconia 
  of 
  not 
  quite 
  circular 
  section, 
  

   having 
  long 
  stalks 
  and 
  a 
  very 
  deeply 
  ribbed 
  surface. 
  The 
  

   androconia 
  are 
  probably 
  porous 
  or 
  very 
  absorbent, 
  as 
  they 
  

   stain 
  rapidly 
  and 
  intensely. 
  The 
  outer 
  surface 
  of 
  the 
  lobe 
  

   is 
  covered 
  ■with 
  extremely 
  minute 
  black 
  setae 
  having 
  

   widened 
  bases, 
  like 
  rose 
  thorns. 
  A 
  section 
  through 
  the 
  

   lobe, 
  fig. 
  19, 
  shows 
  that 
  the 
  extensible 
  membrane 
  contains 
  

   at 
  its 
  base 
  a 
  mass 
  of 
  granular, 
  hea^dly 
  nucleated 
  cells 
  which 
  

   doubtless 
  furnish 
  a 
  volatile 
  secretion. 
  The 
  androconia 
  are 
  

   not 
  provided 
  in 
  this 
  species 
  with 
  special 
  cells 
  at 
  the 
  bases 
  

   of 
  their 
  sockets. 
  Indeed, 
  this 
  is 
  a 
  condition 
  I 
  have 
  found 
  

   only 
  in 
  those 
  of 
  H. 
  sparsa. 
  Fig. 
  16 
  shows 
  a 
  highly 
  magnified 
  

   view 
  of 
  the 
  inner 
  face 
  of 
  one 
  of 
  the 
  lobes. 
  The 
  lobe 
  itself 
  

   is 
  seen 
  to 
  the 
  left, 
  whilst 
  the 
  membrane 
  extends 
  all 
  over 
  

   it 
  and 
  some 
  distance 
  to 
  the 
  right. 
  The 
  androconia 
  He 
  on, 
  

   and 
  arise 
  from, 
  the 
  membrane 
  in 
  an 
  irregular 
  fashion. 
  

   The 
  small 
  bunch 
  of 
  hairs 
  here 
  shown 
  does 
  not 
  in 
  reality 
  

   arise 
  from 
  the 
  membrane 
  of 
  the 
  lobe, 
  but 
  from 
  that 
  on. 
  the 
  

   back 
  of 
  the 
  head 
  between 
  and 
  beneath 
  the 
  lobes, 
  though 
  in 
  

   this 
  dissection 
  they 
  have 
  come 
  away 
  with 
  the 
  lobe 
  itself. 
  

   They 
  take 
  the 
  form 
  of 
  a 
  mere 
  tuft 
  of 
  bristles, 
  and 
  though 
  

   the 
  membrane 
  from 
  which 
  they 
  arise 
  may 
  be 
  slightly 
  

   extensible 
  there 
  is 
  no 
  eversible 
  bag. 
  The 
  hairs 
  are 
  of 
  the 
  

   comphcated 
  structure 
  shown 
  in 
  fig. 
  17 
  and 
  in 
  transverse 
  

   section 
  at 
  fig. 
  18. 
  There 
  is 
  a 
  very 
  slight 
  development 
  of 
  

   glandular 
  epithehum 
  at 
  the 
  origin 
  of 
  these 
  hairs. 
  They 
  

   have 
  a 
  very 
  thin 
  cuticle, 
  and 
  in 
  section 
  show 
  a 
  very 
  large 
  

   lumen. 
  

  

  H. 
  maclachlani 
  Klap. 
  

  

  The 
  structure 
  in 
  this 
  species 
  bears 
  a 
  close 
  general 
  re- 
  

   semblance 
  to 
  that 
  in 
  H. 
  forcipata. 
  The 
  lobes 
  are 
  smaller 
  and 
  

   very 
  inconspicuous, 
  but 
  their 
  extensible 
  membranes 
  seem 
  

   to 
  be 
  more 
  highly 
  developed. 
  Fig. 
  23 
  shows 
  a 
  section 
  

   through 
  one 
  of 
  the 
  lobes 
  and 
  the 
  neighbouring 
  structures. 
  

   The 
  membrane 
  has 
  a 
  dense 
  mass 
  of 
  glandular 
  tissue 
  at 
  its 
  

   base, 
  and 
  bears 
  a 
  number 
  of 
  androconia, 
  one 
  of 
  which 
  is 
  

   represented 
  at 
  fig. 
  20. 
  These 
  are 
  very 
  deeply 
  ribbed 
  and 
  

   circular 
  in 
  section: 
  On 
  one 
  lobe 
  I 
  have 
  mounted 
  there 
  are 
  

   twenty-one, 
  and 
  on 
  another 
  eighteen. 
  The 
  little 
  pencil 
  of 
  

  

  