﻿Gatty 
  Marine 
  Laboratory^ 
  St. 
  Andrews. 
  101 
  

  

  ventral 
  ridjje^ 
  the 
  latter 
  being 
  a 
  modification 
  of 
  the 
  eon- 
  

   necting-ridge. 
  The 
  uncinigerous 
  lamella 
  is 
  bi-auriculate, 
  

   aud 
  remains 
  so 
  to 
  the 
  end. 
  The 
  last 
  four 
  or 
  five 
  feet, 
  hotv- 
  

   ever, 
  are 
  modified, 
  so 
  that 
  only 
  the 
  bi-auriculate 
  uncinigerous 
  

   process 
  remains. 
  

  

  The 
  posterior 
  border 
  of 
  the 
  caudal 
  segment 
  is 
  either 
  

   arcuate 
  or 
  smooth, 
  according 
  to 
  the 
  condition 
  as 
  regards 
  

   reproduction. 
  In 
  those 
  recently 
  reproduced 
  or 
  in 
  process 
  of 
  

   reproduction, 
  it 
  is 
  arcuate, 
  but 
  in 
  entire 
  examples 
  it 
  appears 
  

   to 
  be 
  smooth. 
  The 
  cirri 
  are 
  lateral 
  in 
  position 
  aud 
  of 
  con- 
  

   siderable 
  size. 
  

  

  The 
  tube 
  is 
  composed 
  of 
  mud 
  with 
  a 
  lining 
  of 
  secretion, 
  

   and 
  has 
  various 
  fragments 
  of 
  shells, 
  spines 
  of 
  Spatangns, 
  

   sand, 
  and 
  minute 
  pebbles 
  adherent 
  or 
  mixed 
  with 
  the 
  mud. 
  

   The 
  inner 
  secretion, 
  when 
  first 
  exuded, 
  and 
  before 
  being 
  

   coated 
  with 
  mud 
  and 
  debris, 
  is 
  very 
  tongh. 
  The 
  large 
  

   example 
  from 
  640 
  fathoms 
  had 
  its 
  tube 
  thickly 
  coated 
  with 
  

   mud 
  only. 
  In 
  the 
  Irish 
  example 
  (S.W. 
  Ireland, 
  1835) 
  the 
  

   fragments 
  of 
  shells 
  are 
  imbedcled 
  transversely 
  in 
  the 
  thick 
  

   muddy 
  coating 
  of 
  the 
  tube, 
  giving 
  it 
  a 
  heavy 
  aud 
  dense 
  

   character. 
  The 
  tube 
  is 
  placed 
  vertically 
  in 
  its 
  native 
  site. 
  

  

  An 
  excellent 
  description 
  of 
  this 
  form 
  is 
  given 
  by 
  Fauvel 
  

   (1897) 
  both 
  in 
  regard 
  to 
  external 
  and 
  internal 
  structure. 
  

  

  The 
  Aiiiplncteis 
  curvi/jalea 
  of 
  Claparede 
  *, 
  a 
  form 
  subse- 
  

   quently 
  procured 
  on 
  the 
  shores 
  of 
  France 
  by 
  De 
  St. 
  Joseph 
  

   and 
  at 
  Plymouth 
  by 
  Allen 
  f, 
  is, 
  so 
  far 
  as 
  can 
  be 
  made 
  out 
  

   from 
  the 
  descriptions 
  and 
  an 
  example 
  from 
  Plymouth 
  kindly 
  

   sent 
  for 
  examination 
  by 
  Dr. 
  Allen, 
  an 
  average 
  specimen 
  of 
  

   Amphicteis 
  gunrieri, 
  and 
  Fauvel 
  had 
  formerly 
  come 
  to 
  the 
  

   same 
  conclusion. 
  

  

  The 
  third 
  species 
  is 
  SabeUkles 
  octocirrata, 
  Sars, 
  procured 
  

   off 
  the 
  Hebrides 
  and 
  Ireland. 
  

  

  The 
  Hebridean 
  example 
  is 
  small 
  and 
  presents 
  anteriorly 
  

   a 
  bluntly 
  conical 
  snout, 
  from 
  which 
  the 
  tentacles 
  have 
  been 
  

   removed, 
  but 
  in 
  the 
  Irish 
  specimen 
  they 
  are 
  provided 
  with 
  

   long 
  and 
  proportionally 
  thick 
  papillie 
  or 
  " 
  cilia,^' 
  which, 
  

   however, 
  are 
  devoid 
  of 
  a 
  central 
  axis. 
  The 
  tip 
  in 
  the 
  

   preparation 
  has 
  a 
  '' 
  hairy 
  ^' 
  aspect, 
  as 
  if 
  from 
  numerous 
  

   palpocils. 
  Moreover, 
  the 
  papillae 
  extend 
  nearly 
  to 
  the 
  

   extremity, 
  only 
  a 
  short 
  granular 
  portion 
  projecting 
  beyond 
  

   them. 
  The 
  size 
  of 
  these 
  papillse 
  seems 
  to 
  be 
  a 
  feature 
  of 
  the 
  

   species. 
  

  

  * 
  Aimel. 
  Nap. 
  Siippl. 
  p. 
  132, 
  pi. 
  xiii. 
  Hu-, 
  .5. 
  

   t 
  JoLU-u. 
  M. 
  B, 
  A, 
  N. 
  IS. 
  vul. 
  viii. 
  p. 
  230. 
  

  

  