﻿Gatty 
  Marine 
  Laboratury, 
  St. 
  Andrews. 
  85 
  

  

  After 
  the 
  cirrus 
  the 
  edge 
  slopes 
  backward 
  to 
  form 
  the 
  

   pillars 
  at 
  the 
  sides 
  of 
  the 
  mouth. 
  

  

  The 
  veil 
  is 
  more 
  restricted 
  than 
  in 
  any 
  of 
  the 
  allied 
  forms, 
  

   and 
  its 
  outline 
  is 
  fan-shaped, 
  the 
  anterior 
  edge 
  having 
  ten 
  

   or 
  eleven 
  rather 
  large 
  tapered 
  papillae 
  or 
  (imbriee, 
  the 
  edges 
  

   a 
  ie^ 
  others 
  as 
  they 
  pass 
  to 
  the 
  anterior 
  region 
  of 
  the 
  mouth. 
  

  

  The 
  tentacles 
  arise 
  on 
  each 
  side 
  immediately 
  behind 
  the 
  

   veil, 
  and 
  form 
  a 
  considerable 
  lateral 
  group 
  on 
  each 
  side. 
  

   They 
  have 
  the 
  usual 
  shape, 
  and 
  the 
  extremities 
  in 
  the 
  pre- 
  

   parations, 
  as 
  in 
  life, 
  are 
  often 
  clavate. 
  Numerous 
  smaller 
  

   forms 
  occur 
  posteriorly, 
  and 
  all 
  are 
  attached 
  to 
  a 
  surface 
  

   continuous 
  with 
  and 
  forming 
  part 
  of 
  the 
  veil, 
  and 
  thus 
  are 
  

   in 
  front 
  of 
  the 
  mouth 
  dorsally. 
  The 
  small 
  lateral 
  fold 
  of 
  the 
  

   veil 
  to 
  a 
  certain 
  extent 
  forms 
  a 
  guard 
  autero-laterally. 
  A 
  

   broad 
  fillet 
  occurs 
  on 
  each 
  side 
  of 
  the 
  mouth 
  posteriorly, 
  and 
  

   a 
  median 
  fold 
  completes 
  it 
  behind. 
  

  

  Tlie 
  second 
  cirrus 
  arises 
  laterally 
  a 
  little 
  behind 
  the 
  margin 
  

   of 
  the 
  crown, 
  and 
  is 
  a 
  long 
  subulate 
  tapering 
  organ. 
  A 
  

   ridge 
  passes 
  ventrally 
  from 
  it 
  on 
  each 
  side, 
  meeting 
  its 
  fellow 
  

   in 
  the 
  middle 
  line 
  behind 
  the 
  mouth, 
  and 
  may 
  be 
  taken 
  to 
  

   represent 
  a 
  segment. 
  The 
  next 
  two 
  are 
  branchial 
  segments, 
  

   each 
  having 
  the 
  typical 
  brancliia 
  of 
  the 
  group, 
  viz. 
  a 
  series 
  

   of 
  flat 
  lamellye 
  largest 
  internally 
  and 
  diminishing 
  externally, 
  

   attached 
  to 
  the 
  basal 
  and 
  posterior 
  stem. 
  The 
  second 
  is 
  

   smaller, 
  but 
  of 
  similar 
  structure. 
  These 
  two 
  segments 
  are 
  

   glandular 
  ventrally, 
  and 
  in 
  the 
  centre 
  of 
  each 
  is 
  a 
  median 
  

   fold 
  or 
  boss. 
  

  

  The 
  next 
  region 
  of 
  the 
  body, 
  which 
  is 
  smoothly 
  rounded 
  

   dorsally, 
  flattened 
  and 
  grooved 
  ventrally, 
  consists 
  of 
  three 
  

   bristled 
  segments 
  devoid 
  of 
  hooks. 
  The 
  first 
  two 
  are 
  highly 
  

   glandular 
  ventrally 
  from 
  side 
  to 
  side, 
  and 
  with 
  the 
  median 
  

   fold, 
  whilst 
  the 
  third 
  is 
  apparently 
  only 
  partly 
  so, 
  being 
  con- 
  

   tinued 
  ventrally 
  as 
  a 
  transversely 
  folded 
  band 
  with 
  a 
  slight 
  

   median 
  differentiation. 
  The 
  bristles 
  in 
  these 
  are 
  typical, 
  

   viz., 
  strong 
  bristles 
  with 
  tapering 
  tips, 
  which 
  show 
  traces 
  

   of 
  wings, 
  and 
  those 
  with 
  the 
  spear-head 
  dilatation 
  and 
  the 
  

   long 
  hair-like 
  tips, 
  the 
  edt^e 
  being 
  serrated. 
  

  

  The 
  succeeJing 
  region 
  of 
  the 
  body 
  still 
  remains 
  smoothly 
  

   rounded 
  dorsally, 
  but 
  ventrally 
  it 
  has 
  throughout 
  the 
  five 
  

   or 
  six 
  anterior 
  segments 
  a 
  fusiform 
  area 
  in 
  the 
  centre 
  — 
  

   apparently 
  a 
  special 
  glandular 
  region. 
  At 
  each 
  side 
  ventrally 
  

   in 
  a 
  line 
  with 
  the 
  lamellae 
  is 
  a 
  short 
  glandular 
  patch, 
  which 
  

   diminishes 
  as 
  the 
  segments 
  go 
  backward. 
  The 
  ventral 
  sur- 
  

   face 
  generally 
  is 
  flattened 
  and 
  grooved 
  posteriorly. 
  This 
  

   region 
  has 
  fourteen 
  pairs 
  of 
  dorsal 
  bristle-bundles 
  attached 
  

   to 
  the 
  dorsal 
  edges 
  of 
  the 
  lamellae 
  bearing 
  the 
  rows 
  of 
  hooks. 
  

  

  