﻿150 
  Prof. 
  M'lntosh's 
  Notes 
  from 
  the 
  

  

  foot 
  has 
  in 
  the 
  ventral 
  division 
  four 
  great 
  flattened 
  golden 
  

   bristles 
  with 
  strong 
  blunt 
  points 
  (PI. 
  V. 
  fig. 
  1 
  c) 
  attached 
  to 
  

   the 
  massive 
  setigerous 
  region, 
  a 
  comparatively 
  large 
  lanceo- 
  

   late 
  lamella 
  occurring 
  superiorly, 
  whilst 
  at 
  the 
  ventral 
  edge 
  

   is 
  a 
  small 
  papilla. 
  In 
  the 
  developing 
  organs 
  the 
  points 
  are, 
  

   as 
  usual, 
  first 
  formed. 
  The 
  dorsal 
  bristles 
  form 
  a 
  row 
  supe- 
  

   riorly, 
  and 
  consist 
  of 
  bristles 
  similar 
  to 
  those 
  in 
  front, 
  though 
  

   shorter 
  (PL 
  V. 
  fig. 
  1 
  e). 
  They 
  taper 
  from 
  the 
  base 
  to 
  the 
  

   tip, 
  which 
  is 
  very 
  attenuate, 
  yet 
  they 
  make 
  a 
  somewhat 
  rigid 
  

   pencil 
  or 
  fan. 
  Both 
  they 
  and 
  the 
  ventral 
  bristles 
  are 
  en- 
  

   crusted 
  with 
  very 
  small 
  particles 
  which 
  obscure 
  their 
  minute 
  

   structure. 
  

  

  The 
  next 
  segment 
  is 
  narrow 
  and 
  has 
  a 
  broad 
  though 
  

   narrow 
  dorsal 
  lamella 
  which 
  is 
  lateral 
  in 
  position 
  — 
  that 
  is, 
  

   lies 
  directly 
  above 
  the 
  foot, 
  — 
  and 
  its 
  bristles 
  are 
  directed 
  

   upward 
  in 
  front 
  of 
  it. 
  No 
  ventral 
  bristles 
  are 
  present 
  in 
  

   the 
  specimen. 
  

  

  The 
  following 
  three 
  feet 
  are 
  similar, 
  viz., 
  each 
  having 
  a 
  

   broad 
  and 
  vertically 
  narrow 
  dorsal 
  lamella, 
  with 
  a 
  bristle-tuft 
  

   in 
  front 
  on 
  the 
  dorsum 
  and 
  a 
  well-marked 
  and 
  increasingly 
  

   massive 
  ventral 
  division, 
  bearing 
  a 
  tuft 
  of 
  bristles 
  the 
  central 
  

   series 
  of 
  which 
  is 
  often 
  abruptly 
  truncated 
  below 
  the 
  tip. 
  

   These 
  bristles 
  (PI. 
  V. 
  fig. 
  1/) 
  are 
  rather 
  strong, 
  straight, 
  

   narrowed 
  from 
  the 
  base 
  distally, 
  have 
  a 
  slight 
  curvature 
  

   below 
  the 
  tip, 
  which 
  is 
  tapered 
  to 
  a 
  fine 
  point 
  and 
  feathered 
  

   with 
  a 
  series 
  of 
  spikes. 
  One 
  of 
  the 
  stouter 
  forms 
  from 
  this 
  

   region 
  is 
  represented 
  in 
  fig. 
  1 
  g. 
  

  

  Behind 
  the 
  foregoing 
  the 
  dorsal 
  lamella, 
  which 
  has 
  the 
  

   form 
  of 
  a 
  vertical 
  plate, 
  moves 
  further 
  inward 
  on 
  the 
  dorsum, 
  

   and 
  by 
  and-by 
  considerably 
  diminishes 
  in 
  size, 
  as 
  also 
  do 
  the 
  

   feet 
  at 
  the 
  posterior 
  end 
  of 
  the 
  fragment, 
  from 
  which 
  the 
  

   proboscis 
  projects 
  posteriorly. 
  The 
  dorsal 
  bristles 
  of 
  this 
  

   region 
  (PI. 
  V. 
  fig. 
  1 
  h) 
  have 
  long 
  shafts 
  and 
  finely 
  tapered 
  

   tips. 
  

  

  The 
  head 
  in 
  this 
  form 
  differs 
  from 
  that 
  in 
  Sclerocheilus 
  in 
  

   the 
  absence 
  of 
  the 
  anterior 
  processes 
  and 
  in 
  the 
  absence 
  of 
  

   eyes. 
  No 
  protrusible 
  and 
  ciliated 
  nuchal 
  organs 
  are 
  visible 
  

   at 
  the 
  base 
  of 
  the 
  snout 
  as 
  in 
  Sclerocheilus. 
  The 
  presence 
  

   of 
  the 
  caruncle 
  with 
  the 
  small 
  tentacle 
  behind 
  it 
  also 
  separates 
  

   Nevaya 
  from 
  Sclerocheilus, 
  whilst 
  in 
  certain 
  features 
  it 
  

   approaches 
  Nerine. 
  The 
  buccal 
  segment 
  in 
  the 
  latter 
  is 
  

   achsetous. 
  The 
  second 
  segment 
  in 
  Sclerocheilus 
  bears 
  

   dorsally 
  and 
  ventrally 
  capillary 
  bristles, 
  and 
  a 
  little 
  below 
  

   (" 
  au-dessus 
  ") 
  the 
  ventral 
  papilla 
  five 
  or 
  six 
  powerful 
  golden 
  

   hooks, 
  which 
  De 
  St. 
  Joseph 
  * 
  thinks 
  enable 
  the 
  animal 
  to 
  

  

  * 
  Ann. 
  Sc. 
  Nat. 
  8 
  e 
  s&r. 
  xvii, 
  p. 
  106. 
  

  

  