﻿302 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  lo 
  

  

  set 
  som 
  

  

  setmin 
  

  

  setm 
  

  

  XIOOO 
  

  

  tail. 
  This 
  tubular 
  spinneret 
  is 
  about 
  as 
  wide 
  as 
  one 
  of 
  the 
  spicules 
  of 
  the 
  

   male; 
  it 
  is 
  a 
  simple 
  truncate 
  affair 
  which 
  tapers 
  but 
  very 
  little. 
  A 
  marked 
  

   peculiarity 
  of 
  the 
  posterior 
  extremity 
  of 
  the 
  nema 
  is 
  the 
  existence 
  of 
  numerous 
  

   minute 
  setae 
  ; 
  for 
  a 
  distance 
  equal 
  to 
  the 
  length 
  of 
  the 
  spinneret 
  the 
  setae 
  on 
  

   the 
  portion 
  of 
  the 
  tail 
  immediately 
  in 
  front 
  of 
  the 
  spinneret 
  are 
  very 
  much 
  

   reduced 
  and 
  more 
  numerous. 
  The 
  spherical 
  caudal 
  glands 
  are 
  located 
  behind 
  

   the 
  anus 
  in 
  the 
  anterior 
  fourth 
  of 
  the 
  tail 
  and 
  empty 
  through 
  separate 
  ducts; 
  

   each 
  is 
  about 
  one-fifth 
  as 
  wide 
  as 
  the 
  corresponding 
  portion 
  of 
  the 
  tail, 
  or 
  as 
  

   wide 
  as 
  one 
  of 
  the 
  somatic 
  annules 
  opposite. 
  Only 
  two 
  nuclei 
  were 
  seen 
  in 
  

   connection 
  with 
  these 
  glands, 
  and 
  these 
  were 
  located 
  in 
  the 
  vicinity 
  of 
  the 
  anus, 
  

   their 
  number 
  indicating 
  that 
  the 
  number 
  of 
  caudal 
  glands 
  may 
  be 
  less 
  than 
  

   the 
  usual 
  three. 
  The 
  excretory 
  pore 
  lies 
  near 
  the 
  nerve-ring 
  opposite 
  the 
  sixth 
  

   annule 
  in 
  the 
  male 
  and 
  opposite 
  the 
  seventh 
  in 
  the 
  female 
  ; 
  its 
  spherical 
  ampulla 
  

   is 
  one-fourth 
  as 
  wide 
  as 
  the 
  corresponding 
  portion 
  of 
  the 
  neck. 
  The 
  nerve- 
  

   ring 
  surrounds 
  the 
  oesophagus 
  somewhat 
  obliquely 
  where 
  it 
  first 
  diminishes 
  

   in 
  diameter 
  somewhat 
  behind 
  the 
  middle. 
  In 
  the 
  dorsal 
  side 
  of 
  the 
  neck, 
  

   opposite 
  the 
  9-14 
  rows 
  of 
  setae 
  there 
  are 
  some 
  relatively 
  large 
  organs, 
  — 
  

   probably 
  two 
  or 
  more 
  finely 
  granular 
  cells. 
  From 
  the 
  somewhat 
  inconspicu- 
  

   ous, 
  small, 
  elevated 
  vulva, 
  which 
  is 
  surrounded 
  by 
  minute 
  setae, 
  the 
  small, 
  

   weak, 
  non-cutinized, 
  tubular 
  vagina 
  leads 
  inward 
  at 
  right 
  angles 
  to 
  the 
  

   ventral 
  surface 
  about 
  one-third 
  the 
  distance 
  across 
  the 
  body. 
  Little 
  is 
  known 
  

   concerning 
  the 
  double 
  symmetrically 
  refiexed 
  female 
  sexual 
  organs. 
  

  

  1.5 
  6. 
  6 
  10.6 
  |_M 
  76. 
  

  

  .setm 
  3.2 
  7.7/ 
  11. 
  18.— 
  -^n7>°-^"* 
  

  

  The 
  slightly 
  arcuate, 
  irregularly 
  

   conoid, 
  faintly 
  sigmoid 
  tail 
  of 
  the 
  

   male, 
  on 
  the 
  whole, 
  rather 
  re- 
  

   ..ampnlt 
  sembles 
  that 
  of 
  his 
  mate. 
  The 
  

   two 
  equal, 
  straight, 
  very 
  slender, 
  

   uniform, 
  acute, 
  colorless 
  spicula, 
  

   which 
  are 
  slightly 
  cephalated 
  by 
  

   expansion, 
  are 
  about 
  one 
  and 
  one- 
  

   fourth 
  times 
  as 
  long 
  as 
  the 
  anal 
  

   body 
  diameter. 
  If 
  swung 
  around 
  

   behind 
  the 
  anus, 
  they 
  would 
  just 
  

   about 
  reach 
  to 
  the 
  base 
  of 
  the 
  

   spinneret; 
  they 
  are 
  about 
  twice 
  as 
  

   wide 
  as 
  the 
  bases 
  of 
  the 
  somatic 
  

   setae, 
  are 
  a 
  little 
  larger 
  distally 
  

   than 
  elsewhere, 
  and 
  are 
  perhaps 
  

   winged. 
  No 
  gubernaculum 
  has 
  been 
  seen. 
  On 
  the 
  fifth 
  and 
  eleventh 
  

   annules 
  in 
  front 
  of 
  the 
  anus 
  occur 
  ventrally 
  submedian 
  papilla-like 
  organs, 
  

   indicated 
  by 
  the 
  presence 
  of 
  minute 
  setae 
  arranged 
  in 
  a 
  cluster 
  about 
  a 
  

   nerve 
  ending 
  (?), 
  — 
  about 
  ten 
  setae 
  on 
  the 
  fifth 
  annule 
  and 
  a 
  much 
  smaller 
  

   number 
  on 
  the 
  eleventh. 
  There 
  are 
  also 
  similar 
  ventrally 
  sublateral 
  bunches 
  

   of 
  setae 
  on 
  the 
  annules 
  preceding 
  the 
  large 
  (duplex?) 
  conical 
  one 
  bearing 
  the 
  

   spinneret. 
  On 
  the 
  lateral 
  field 
  near 
  the 
  middle 
  of 
  the 
  male, 
  a 
  bunch 
  of 
  minute 
  

   setae 
  was 
  observed 
  like 
  those 
  on 
  the 
  fifth 
  annule 
  in 
  front 
  of 
  the 
  anus. 
  The 
  

   nature 
  of 
  these 
  special 
  organs, 
  for 
  such 
  they 
  must 
  be, 
  remains 
  in 
  doubt. 
  

   It 
  seems 
  quite 
  possible 
  that 
  some 
  of 
  them 
  are 
  male 
  supplementary 
  organs. 
  

   The 
  wide 
  cylindrical 
  testis 
  is 
  one-half 
  as 
  wide 
  as 
  the 
  body 
  and 
  is 
  refiexed 
  to 
  

   near 
  the 
  proximal 
  ends 
  of 
  the 
  spicula. 
  

  

  set 
  tb 
  

  

  \y.mult 
  

   spn 
  

  

  Fig. 
  3. 
  — 
  Tail 
  end 
  of 
  Greeffiella 
  dasyura. 
  Let- 
  

   tering 
  as 
  in 
  Figs. 
  1 
  and 
  2. 
  mm 
  pnlt, 
  penultimate 
  

   annfile; 
  ami 
  tilt, 
  ultimate 
  annule; 
  spn, 
  spinneret. 
  

  

  