﻿Gatty 
  Marine 
  LaJ>oratory 
  ^ 
  St. 
  Andrews. 
  91 
  

  

  flattened 
  and 
  somewhat 
  grooved 
  ventrally, 
  whilst 
  iu 
  series 
  

   from 
  front 
  to 
  rear 
  are 
  the 
  branchiae 
  immediately 
  behind 
  the 
  

   long 
  cirrus, 
  a 
  segment 
  without 
  bristles, 
  and 
  fifteen 
  bristle- 
  

   tufts, 
  with 
  lamellae 
  for 
  the 
  hooks 
  from 
  the 
  fourth 
  bristle- 
  

   tuft 
  backward 
  — 
  or 
  twelve 
  in 
  all. 
  

  

  The 
  general 
  hue 
  of 
  the 
  dorsum 
  is 
  brownish 
  pink, 
  the 
  

   dorsal 
  blood-vessel 
  and 
  the 
  gills 
  being 
  deep 
  red. 
  The 
  first 
  

   three 
  body-segments 
  have 
  numerous 
  brown 
  specks 
  (eyes?) 
  

   on 
  their 
  posterior 
  edges. 
  The 
  tentacles 
  are 
  dull 
  pinkish 
  in 
  

   mass. 
  The 
  caudal 
  process 
  is 
  slightly 
  yellowish. 
  The 
  intes- 
  

   tine 
  shines 
  through 
  the 
  translucent 
  iridescent 
  skin 
  as 
  pale 
  

   brownish, 
  and 
  a 
  large 
  blood-vessel 
  is 
  attached 
  to 
  it 
  dorsally 
  

   below 
  the 
  more 
  slender 
  median 
  dorsal 
  trunk. 
  This 
  large 
  

   trunk 
  appears 
  to 
  end 
  iu 
  the 
  deep 
  opaque 
  reddish 
  mass 
  below 
  

   the 
  median 
  fillet 
  of 
  the 
  second 
  bristled 
  segment. 
  The 
  

   median 
  dorsal 
  (superficial) 
  trunk 
  commences 
  at 
  the 
  tail, 
  

   whereas 
  the 
  larger 
  and 
  deeper 
  trunk 
  on 
  the 
  gut 
  appears 
  

   about 
  the 
  third 
  hook-pad 
  posteriorly, 
  and 
  the 
  blood 
  comes 
  

   from 
  below. 
  The 
  former 
  contracts 
  from 
  behind 
  forward, 
  

   squeezing 
  the 
  vessel 
  into 
  a 
  pale 
  thread. 
  The 
  entire 
  skin 
  is 
  

   minutely 
  reticulated 
  with 
  minute 
  red^ 
  blood-vessels. 
  On 
  

   tlie 
  ventral 
  surface 
  is 
  a 
  lateral 
  trunk 
  on 
  each 
  side, 
  which 
  

   carries 
  tlie 
  blood 
  backward, 
  and 
  which 
  appears 
  to 
  form 
  the 
  

   dorsal. 
  The 
  caudal 
  process 
  has 
  pale 
  papillae 
  along 
  its 
  sides. 
  

  

  The 
  branchiae 
  are 
  usually 
  two 
  in 
  number, 
  though 
  occasion- 
  

   ally 
  the 
  posterior 
  on 
  one 
  side 
  is 
  absent. 
  The 
  anterior 
  lies 
  

   immediately 
  behind 
  the 
  long 
  lateral 
  cirrus 
  and 
  has 
  the 
  form 
  

   of 
  a 
  coiled 
  process 
  placed 
  transversely, 
  to 
  which 
  are 
  attached 
  

   many 
  membranous 
  leaf-like 
  })lates, 
  which 
  gradually 
  diminish 
  

   in 
  size 
  toward 
  the 
  tip, 
  the 
  wiiole 
  somewhat 
  resembling 
  the 
  

   antenna 
  of 
  a 
  lamellicorn 
  beetle 
  or 
  the 
  scorpoid 
  cyme 
  of 
  

   Forget-me-not 
  or 
  Boiage. 
  With 
  the 
  leaflets 
  crowded 
  so 
  

   thickly, 
  the 
  coiling 
  of 
  the 
  axis 
  and 
  the 
  diminution 
  of 
  the 
  

   lamellcE 
  at 
  the 
  tip 
  present 
  special 
  advantage 
  for 
  aeration. 
  

   The 
  second 
  branchia 
  arises 
  from 
  the 
  dorsal 
  edge 
  of 
  the 
  

   segment-ridge 
  behind 
  the 
  former, 
  and 
  its 
  structure 
  is 
  the 
  

   same. 
  The 
  organs 
  are 
  firmly 
  attached 
  to 
  the 
  skin, 
  and 
  in 
  

   softened 
  examples 
  are 
  removed 
  with 
  it. 
  In 
  life 
  the 
  bright 
  

   red 
  branchiae 
  are 
  most 
  sensitive 
  organs 
  — 
  now 
  being 
  gently 
  

   extended 
  so 
  as 
  to 
  expose 
  each 
  lamella 
  separately 
  to 
  the 
  

   water, 
  and 
  again 
  abiuptly 
  contracted 
  into 
  a 
  mass. 
  

  

  Dorsally 
  segmentation 
  is 
  less 
  evident, 
  but 
  on 
  the 
  ventral 
  

   surface 
  the 
  median 
  and 
  lateral 
  ridges 
  give 
  more 
  definition 
  

   in 
  this 
  respect. 
  A 
  flat 
  papilla, 
  from 
  which 
  a 
  ridge 
  and 
  

   groove 
  run 
  to 
  the 
  mouth, 
  lies 
  within 
  the 
  long 
  cirrus 
  behind 
  

   the 
  veil. 
  Then 
  a 
  forward 
  median 
  fold 
  behind 
  the 
  mouth 
  is- 
  

  

  