﻿NOV. 
  4, 
  1922 
  COBB 
  : 
  a 
  new 
  species 
  of 
  nygolaimus 
  419 
  

  

  half 
  to 
  one 
  micron 
  thick. 
  The 
  width 
  of 
  the 
  main, 
  that 
  is, 
  posterior, 
  por- 
  

   tion 
  of 
  the 
  cavity 
  of 
  the 
  pharynx 
  is 
  about 
  four 
  microns. 
  The 
  slender 
  

   slightly 
  arcuate 
  onchium 
  is 
  one-third 
  as 
  long 
  as 
  the 
  lip 
  region 
  is 
  wide 
  

   and 
  when 
  at 
  rest 
  reaches 
  one-third 
  the 
  distance 
  from 
  its 
  base 
  to 
  the 
  

   anterior 
  border 
  of 
  the 
  head. 
  It 
  is 
  a 
  left 
  ventrally 
  submedian 
  organ, 
  

   and 
  may 
  almost 
  be 
  said 
  to 
  be 
  set 
  in 
  a 
  pharyngeal 
  niche 
  of 
  its 
  own. 
  Not 
  

   only 
  is 
  it 
  slightly 
  arcuate 
  but 
  the 
  tendency 
  is 
  for 
  its 
  apex 
  to 
  be 
  swung 
  

   outward 
  a 
  little 
  when 
  at 
  rest. 
  It 
  tapers 
  from 
  its 
  base 
  to 
  its 
  acute 
  

   anterior 
  extremity 
  and 
  at 
  its 
  widest 
  part 
  is 
  about 
  one-fourth 
  as 
  wide 
  

   as 
  the 
  adjacent 
  cuticle 
  is 
  thick. 
  That 
  portion 
  of 
  the 
  compound 
  

   pharnyx 
  behind 
  the 
  base 
  of 
  the 
  onchium 
  is 
  about 
  one 
  and 
  one-half 
  

   times 
  as 
  long 
  as 
  the 
  part 
  in 
  front 
  of 
  it, 
  vestibule 
  included. 
  It 
  is 
  the 
  

   posterior 
  two-thirds 
  of 
  the 
  fusiform 
  widest 
  portion 
  of 
  the 
  pharynx 
  which 
  

   is 
  lined 
  with 
  the 
  above-mentioned 
  denticles. 
  The 
  large 
  amphids, 
  like 
  

   the 
  onchium, 
  are 
  very 
  much 
  like 
  those 
  of 
  N. 
  pachydermatus 
  , 
  and 
  are 
  

   very 
  conspicuous, 
  and 
  externally 
  somewhat 
  escutcheon 
  shaped; 
  they 
  

   have 
  their 
  front 
  borders 
  removed 
  from 
  the 
  anterior 
  extremity 
  of 
  the 
  

   nema 
  a 
  distance 
  about 
  one-third 
  as 
  great 
  as 
  the 
  corresponding 
  diam- 
  

   eter 
  of 
  the 
  head. 
  They 
  are 
  about 
  three-fifths 
  as 
  wide 
  as 
  the 
  corre- 
  

   sponding 
  part 
  of 
  the 
  head 
  and 
  nearly 
  as 
  long 
  as 
  wide. 
  There 
  are 
  no 
  

   eyespots. 
  The 
  oesophagus, 
  which 
  is 
  dorylaimoid, 
  enlarges 
  somewhat 
  

   gradually 
  near 
  the 
  middle; 
  the 
  two 
  parts 
  of 
  the 
  oesophagus 
  are 
  

   not 
  very 
  clearly 
  set 
  off 
  from 
  each 
  other. 
  Behind 
  the 
  pharynx 
  the 
  

   oesophagus 
  is 
  about 
  one-third, 
  at 
  the 
  nerve 
  ring 
  about 
  one-fourth, 
  and 
  

   finally 
  about 
  one-half 
  as 
  wide 
  as 
  the 
  corresponding 
  portion 
  of 
  the 
  neck. 
  

   The 
  lining 
  of 
  the 
  oesophagus 
  is 
  a 
  very 
  distinct 
  feature 
  throughout 
  its 
  

   length 
  ; 
  anteriorly 
  it 
  is 
  tubular 
  and 
  highly 
  refractive 
  and 
  about 
  one- 
  

   fourth 
  as 
  wide 
  as 
  the 
  oesophagus 
  ; 
  posteriorly 
  it 
  is 
  more 
  distinctly 
  triquet- 
  

   rous 
  and 
  somewhat 
  wider 
  — 
  again 
  about 
  one-fourth 
  as 
  wide 
  as 
  the 
  corre- 
  

   sponding 
  portion 
  of 
  the 
  oesophagus. 
  The 
  musculature 
  of 
  the 
  oesoph- 
  

   agus 
  is 
  rather 
  coarse 
  and 
  colorless. 
  It 
  is 
  not 
  yet 
  known 
  positively 
  

   whether 
  there 
  are 
  any 
  glands 
  in 
  the 
  tissue 
  of 
  the 
  oesophagus 
  — 
  ^but 
  it 
  

   is 
  almost 
  certain 
  that 
  they 
  are 
  present. 
  The 
  conoid 
  cardia 
  is 
  about 
  

   one-third 
  as 
  wide 
  as 
  the 
  base 
  of 
  the 
  neck. 
  There 
  are 
  no 
  valves 
  in 
  

   the 
  oesophagus. 
  The 
  rather 
  opaque 
  thick-walled 
  intestine, 
  which 
  

   presents 
  a 
  faint, 
  very 
  slightly 
  zigzag 
  lumen, 
  becomes 
  at 
  once 
  one- 
  

   half 
  'as 
  wide 
  as 
  the 
  body, 
  and 
  is 
  separated 
  from 
  the 
  oesophagus 
  by 
  a 
  

   coUum 
  about 
  one-third 
  as 
  wide 
  as 
  the 
  base 
  of 
  the 
  neck. 
  It 
  is 
  com- 
  

   posed 
  of 
  cells 
  of 
  such 
  a 
  size 
  that 
  about 
  six 
  are 
  presented 
  in 
  each 
  cross 
  

   section. 
  There 
  is 
  a 
  distinct 
  pre-rectum 
  about 
  five 
  times 
  as 
  long 
  as 
  

  

  