﻿426 
  Prof. 
  M'Intosh 
  on 
  the 
  

  

  In 
  the 
  anterior 
  region 
  the 
  dorsal 
  lamellae, 
  as 
  usually 
  seen 
  

   from 
  the 
  dorsum, 
  are 
  larger 
  than 
  the 
  inferior 
  and 
  somewhat 
  

   more 
  translucent. 
  In 
  front 
  of 
  the 
  insertion 
  of 
  the 
  bristles 
  

   is 
  a 
  pad 
  of 
  cuticle 
  and 
  hypoderm. 
  While 
  the 
  inferior 
  

   lamella 
  is 
  smaller, 
  its 
  bristles 
  are 
  longer. 
  The 
  lamellae 
  of 
  

   the 
  ninth 
  body-segment 
  are 
  very 
  prominent, 
  and 
  between 
  

   them 
  and 
  the 
  pads 
  in 
  front 
  the 
  bristles 
  project. 
  In 
  the 
  

   posterior 
  segments 
  each 
  forms 
  a 
  large 
  fan-shaped 
  process 
  

   extending 
  from 
  the 
  body-wall, 
  and 
  a 
  pad 
  at 
  the 
  base 
  bears 
  

   the 
  hooks. 
  In 
  addition 
  to 
  the 
  lamella 
  there 
  is 
  a 
  small 
  conical 
  

   hypodermic 
  papilla 
  (which, 
  in 
  the 
  living 
  animal, 
  at 
  first 
  sight 
  

   resembles 
  the 
  point 
  of 
  a 
  spine) 
  at 
  the 
  inner 
  side 
  of 
  each 
  row 
  

   of 
  hooks. 
  Toward 
  the 
  tail 
  they 
  assume 
  a 
  filiform 
  appear- 
  

   ance, 
  and 
  in 
  section 
  their 
  structure 
  approaches 
  that 
  of 
  the 
  

   caudal 
  cirri. 
  

  

  In 
  minute 
  structure 
  the 
  hypoderm 
  very 
  much 
  resembles 
  

   the 
  cutis 
  of 
  the 
  Nemerteans, 
  presenting 
  under 
  pressure 
  a 
  

   series 
  of 
  flask-shaped 
  cells 
  or 
  glands, 
  from 
  which 
  the 
  contents 
  

   often 
  escape 
  in 
  the 
  form 
  of 
  clear 
  and 
  granular 
  globules. 
  

   Moreover, 
  it 
  contains 
  a 
  vast 
  number 
  of 
  bacillary 
  cells 
  or 
  

   glands, 
  the 
  structures 
  being 
  slightly 
  acted 
  on 
  by 
  water, 
  which 
  

   are 
  found 
  abundantly 
  in 
  the 
  snout, 
  cover 
  for 
  the 
  most 
  part 
  

   the 
  entire 
  anterior 
  region, 
  and 
  besides 
  being 
  continuous 
  

   along 
  the 
  sides 
  in 
  the 
  posterior 
  region, 
  form 
  a 
  baud 
  across 
  

   the 
  body 
  behind 
  each 
  row 
  of 
  hooks. 
  They 
  are 
  very 
  con- 
  

   spicuous 
  in 
  the 
  caudal 
  region. 
  

  

  Most 
  of 
  the 
  so-called 
  granular 
  glands 
  or 
  cells, 
  indeed, 
  

   seem 
  to 
  be 
  bacillary 
  cells. 
  The 
  appearance 
  of 
  the 
  latter 
  

   varies 
  according 
  to 
  position, 
  for 
  when 
  seen 
  on 
  end 
  each 
  

   appears 
  to 
  be 
  granular, 
  while 
  a 
  lateral 
  view 
  exhibits 
  the 
  rod- 
  

   like 
  bacillary 
  bodies. 
  These 
  organs 
  are 
  soon 
  destroyed 
  by 
  

   pressure 
  and 
  are 
  not 
  well 
  seen 
  in 
  most 
  spirit-preparations. 
  

   They 
  are 
  best 
  observed 
  in 
  living 
  or 
  fresh 
  animals 
  in 
  sea- 
  

   water, 
  are 
  common 
  in 
  the 
  Spionidae, 
  and 
  are 
  termed 
  by 
  

   M. 
  Claparede 
  bacilliparous 
  glands. 
  When 
  pressure 
  is 
  made 
  

   on 
  the 
  posterior 
  end 
  of 
  a 
  fresh 
  specimen 
  the 
  enormous 
  

   numbers 
  of 
  these 
  cells 
  and 
  bodies 
  is 
  remarkable, 
  and 
  the 
  

   latter 
  often 
  form 
  stellate 
  groups 
  on 
  piercing 
  the 
  cuticle. 
  

   Many 
  of 
  the 
  cells 
  contain 
  pigment 
  and 
  others 
  a 
  large 
  clear 
  

   globule. 
  

  

  In 
  the 
  tentacles 
  are 
  a 
  number 
  of 
  small 
  but 
  distinctly 
  

   granular 
  hypodermic 
  cells, 
  which 
  form 
  rows 
  in 
  the 
  contracted 
  

   state 
  between 
  the 
  rugae 
  of 
  the 
  cuticle, 
  at 
  the 
  base, 
  below 
  the 
  

   papillose 
  margin. 
  

  

  A 
  hypodermic 
  process 
  (like 
  a 
  short 
  conical 
  tentacle) 
  

  

  