﻿300 
  JOURNAL 
  OF 
  the; 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  13 
  

  

  amph 
  

  

  lum 
  oe 
  

  

  set 
  cpfi 
  

  

  and 
  are 
  apparently 
  too 
  numerous 
  and 
  crowded 
  to 
  permit 
  of 
  any 
  exact 
  order 
  ; 
  

  

  however, 
  about 
  twelve 
  of 
  the 
  anterior 
  ones 
  are 
  spread 
  outward 
  and 
  forward 
  

  

  while 
  all 
  the 
  others 
  spread 
  out 
  

   more 
  or 
  less 
  backward. 
  These 
  

   som.ewhat 
  curved, 
  rather 
  slender, 
  

   tapering, 
  acute, 
  somewhat 
  stiff 
  

   cephalic 
  setae 
  are 
  of 
  the 
  same 
  

   character 
  as 
  the 
  great 
  bulk 
  of 
  the 
  

   somatic 
  setae. 
  Among 
  the 
  somatic 
  

   setae 
  however 
  are 
  a 
  few 
  relatively 
  

   large, 
  hollow, 
  open 
  bristles 
  of 
  an- 
  

   other 
  character, 
  resembling 
  the 
  

   locomotor 
  bristles 
  found 
  on 
  Dra- 
  

   conenia, 
  Desm-oscolex, 
  etc. 
  For 
  in- 
  

   stance, 
  on 
  the 
  third 
  and 
  eighth 
  

   annule 
  of 
  the 
  female, 
  and 
  on 
  the 
  

   second 
  and 
  seventh 
  annule 
  of 
  the 
  

   male, 
  that 
  is 
  to 
  say 
  in 
  the 
  rows 
  of 
  

   setae 
  on 
  these 
  annules, 
  there 
  occur 
  

   subdorsal 
  (on 
  the 
  second 
  and 
  third 
  

   annules) 
  and 
  dorsally 
  submedian 
  

   (on 
  the 
  seventh 
  and 
  eighth 
  annules) 
  

   pairs 
  of 
  spreading 
  tubular 
  open- 
  

   mouthed 
  setae, 
  or 
  bristles, 
  a 
  little 
  

   longer 
  than 
  the 
  regular 
  somatic 
  

   setae. 
  These 
  special 
  setae 
  have 
  

   extra 
  large 
  bases 
  and 
  are 
  probably 
  

   connected 
  with 
  glands. 
  The 
  rows 
  

   of 
  ordinary 
  cervical 
  setae 
  have 
  a 
  

   fringe 
  of 
  shorter 
  setae 
  in 
  their 
  

   midst. 
  As 
  before 
  remarked, 
  the 
  

   somatic 
  setae 
  are 
  in 
  fifty-six 
  or 
  

   fifty-seven 
  transversa 
  rows, 
  — 
  ex- 
  

   cluding 
  those 
  on 
  the 
  head, 
  but 
  

  

  set 
  soin 
  mm 
  

  

  set 
  som 
  mqj 
  x 
  1000 
  

  

  Fig. 
  1. 
  — 
  Head 
  end 
  oi 
  Greeffiella 
  dasyura. 
  The 
  

   setae 
  on 
  several 
  annules 
  immediately 
  behind 
  the 
  

   head 
  have 
  been 
  omitted 
  so 
  as 
  to 
  show 
  internal 
  

   details 
  more 
  clearly, 
  amph, 
  amphid 
  ; 
  an, 
  annule 
  ; 
  

   int, 
  location 
  of 
  the 
  beginning 
  of 
  the 
  intestine 
  

   (see 
  also 
  Fig. 
  2.) 
  ; 
  him 
  oe, 
  lumen 
  of 
  the 
  oesopha- 
  

   gus; 
  oe, 
  oesophagus; 
  or, 
  mouth 
  opening; 
  ph, 
  

   pharynx; 
  set 
  cph, 
  cephalic 
  setae, 
  — 
  a 
  number 
  of 
  

   which 
  are 
  omitted 
  ; 
  set 
  som 
  maj, 
  one 
  of 
  the 
  larger 
  

   somatic 
  setae; 
  set 
  som 
  min, 
  one 
  of 
  the 
  smaller 
  

   somatic 
  setae; 
  set 
  tb, 
  tubular 
  seta. 
  

  

  counting 
  the 
  finely 
  pilose 
  region 
  

   in 
  front 
  of 
  the 
  spinneret 
  as 
  two 
  

   annules. 
  See 
  Fig. 
  3. 
  Passing 
  back- 
  

   ward, 
  the 
  setae 
  grow 
  steadily 
  longer 
  from 
  the 
  head 
  to 
  the 
  tail; 
  the 
  posterior 
  

   ones 
  are 
  about 
  one 
  and 
  one-half 
  times 
  as 
  long 
  as 
  the 
  spinneret, 
  while 
  the 
  

   anterior 
  ones 
  are 
  somewhat 
  shorter 
  than 
  the 
  spinneret. 
  Back 
  as 
  far 
  as 
  the 
  

   beginning 
  of 
  the 
  intestine, 
  the 
  rows 
  of 
  setae 
  present 
  minute 
  toothed 
  fringes, 
  

   accentuating 
  the 
  annules. 
  The 
  conoid 
  neck 
  ends 
  in 
  a 
  rounded, 
  somewhat 
  

   flattish 
  hemispheroidal 
  head, 
  set 
  off 
  by 
  a 
  narrow, 
  deep 
  and 
  distinct 
  constric- 
  

   tion. 
  The 
  lips 
  are 
  amalgamated 
  and 
  fixed. 
  Nothing 
  is 
  known 
  concerning 
  

   the 
  labial 
  papillae. 
  The 
  pharynx 
  is 
  exceedingly 
  minute 
  and 
  easily 
  overlooked, 
  

   but 
  is, 
  in 
  fact, 
  a 
  minute, 
  simple, 
  obscure, 
  straight, 
  regular, 
  tubular, 
  closed, 
  

   unarmed 
  region 
  about 
  one-sixth 
  as 
  wide 
  as 
  the 
  head 
  and 
  twice 
  as 
  long 
  as 
  wide 
  ; 
  

   these 
  measurements 
  include 
  its 
  enclosing 
  pharyngeal 
  tissue. 
  Under 
  ordinary 
  

   circumstances 
  there 
  is 
  to 
  be 
  seen 
  here 
  only 
  a 
  closed 
  lumen. 
  Passing 
  back- 
  

   ward 
  from 
  the 
  pharynx, 
  the 
  oesophagus 
  for 
  a 
  distance 
  two 
  and 
  one-half 
  times 
  

   as 
  great 
  as 
  the 
  width 
  of 
  the 
  head, 
  is 
  cylindroid; 
  however, 
  it 
  widens 
  slightly, 
  

  

  