﻿Gatti/ 
  .}fariiie 
  Lahorafori/j 
  St. 
  Andrews. 
  93 
  

  

  The 
  caudal 
  process 
  recalls 
  the 
  condition 
  in 
  the 
  Ophcliidie 
  

   jtist 
  as 
  the 
  head, 
  buccal 
  region, 
  and 
  the 
  first 
  body-regiou 
  

   do 
  those 
  of 
  the 
  Hermellidse. 
  Two 
  segments 
  without 
  bristles 
  

   follow 
  the 
  last 
  bristle-bundles, 
  and 
  then 
  a 
  constriction, 
  the 
  

   anal 
  process 
  sharply 
  curving 
  ventrally 
  thereafter. 
  In 
  out- 
  

   line 
  it 
  is 
  M7/sos(07num-s\\ii])ed, 
  having 
  a 
  convex 
  obliquely 
  

   striated 
  ventral 
  surface 
  and 
  a 
  concave 
  transversely 
  striated 
  

   dorsal 
  surface, 
  like 
  a 
  sucker, 
  surrounded 
  by 
  a 
  rim 
  whic]\ 
  is 
  

   notched 
  and 
  papillose, 
  and 
  terminating 
  distally 
  in 
  a 
  differ- 
  

   entiated 
  flap 
  ventral 
  to 
  the 
  anus, 
  and 
  another 
  freely 
  movable 
  

   Hap 
  of 
  the 
  same 
  length 
  dorsally. 
  At 
  the 
  origin 
  of 
  the 
  caudal 
  

   process 
  three 
  or 
  four 
  hooks 
  occur 
  on 
  each 
  side 
  of 
  the 
  median 
  

   dorsal 
  groove. 
  They 
  have 
  short, 
  stout, 
  striated 
  shafts 
  and 
  

   acutely 
  curved 
  tips, 
  a 
  few 
  transverse 
  striae 
  also 
  being 
  present 
  

   here 
  and 
  there 
  on 
  the 
  shaft, 
  especially 
  at 
  the 
  base. 
  One 
  or 
  

   two 
  developing 
  forms 
  accompany 
  the 
  former. 
  

  

  In 
  a 
  small 
  variety 
  from 
  iSiorway 
  (dredged 
  by 
  Canon 
  

   Norman) 
  the 
  dorsal 
  flap 
  has 
  a 
  distinctly 
  papillose 
  margin, 
  

   a 
  condition 
  also 
  seen 
  in 
  those 
  from 
  Naples. 
  

  

  The 
  anal 
  funnel 
  is, 
  when 
  the 
  animal 
  is 
  removed 
  from 
  the 
  

   tube, 
  carried 
  at 
  an 
  angle, 
  usually 
  greater 
  than 
  a 
  right 
  angle, 
  

   to 
  the 
  caudal 
  region, 
  is 
  rounded 
  ventrally, 
  flattened 
  dorsally, 
  

   and 
  with 
  a 
  spathulate 
  valve 
  hinged 
  dorsally 
  at 
  the 
  tip. 
  The 
  

   dorsal 
  edges 
  of 
  the 
  process 
  are 
  somewhat 
  scalloped 
  at 
  the 
  

   base, 
  one 
  deep 
  fissure 
  being 
  present, 
  and 
  each 
  edge 
  has 
  four 
  

   small 
  clavate 
  papillae. 
  The 
  dorsal 
  surface 
  of 
  the 
  organ 
  is 
  

   often 
  expanded 
  into 
  a 
  wide 
  sucker 
  with 
  an 
  obliquely 
  ridged 
  

   centre 
  and 
  a 
  free 
  crenated 
  edge. 
  The 
  apparatus 
  would 
  seem 
  

   to 
  act 
  as 
  a 
  powerful 
  ejector. 
  

  

  The 
  tubes 
  of 
  the 
  Neapolitan 
  examples 
  [Pectiriaria 
  neapoli- 
  

   iana) 
  are 
  remarkable 
  for 
  their 
  coarseness 
  and 
  dark 
  colour, 
  

   from 
  the 
  number 
  of 
  black 
  sand-grains 
  intermingled 
  with 
  

   brown, 
  yellow, 
  and 
  white. 
  The 
  sand 
  in 
  the 
  intestines 
  of 
  the 
  

   specimens 
  is 
  equally 
  dark. 
  The 
  tube, 
  again, 
  of 
  a 
  small 
  

   variety 
  from 
  Norway, 
  Lophoheliu-gvound, 
  Drobak, 
  6-14 
  fath. 
  

   (Canon 
  Norman), 
  is 
  formed 
  of 
  comparatively 
  coarse 
  frag- 
  

   ments 
  — 
  almost 
  as 
  coarse 
  as 
  those 
  of 
  Petta 
  pusilla. 
  

  

  Young 
  examples, 
  apparently 
  of 
  this 
  form, 
  occur 
  frequently 
  

   in 
  the 
  bottom 
  nets 
  at 
  the 
  end 
  of 
  June 
  and 
  in 
  July 
  in 
  St. 
  

   Andrews 
  Bay. 
  They 
  occupy 
  little 
  transparent 
  tubes, 
  about 
  

   1 
  mm. 
  in 
  length, 
  nearly 
  straight 
  and 
  tapered 
  posteriorly, 
  

   both 
  ends 
  being 
  open. 
  This 
  tube 
  is 
  composed 
  solely 
  of 
  

   secretion, 
  and 
  mimics 
  the 
  adult 
  tube 
  of 
  sand-grains. 
  The 
  

   posterior 
  end 
  of 
  the 
  tube 
  presents 
  a 
  clear 
  transparent 
  

   margin, 
  then 
  a 
  granular 
  belt, 
  which 
  is 
  followed 
  by 
  somewhat 
  

   smaller 
  reticulations 
  than 
  in 
  front. 
  The 
  tube 
  is 
  further 
  

  

  