﻿Galty 
  Marine 
  Laboratory, 
  St. 
  Andrews. 
  147 
  

  

  along 
  the 
  convex 
  side, 
  and 
  slightly 
  enlarged 
  and 
  bifid 
  at 
  the 
  

   end." 
  Beneath 
  this 
  is 
  a 
  fau-like 
  tuft 
  of 
  compound 
  bristles 
  

   with 
  slightly 
  curved 
  shafts 
  and 
  somewhat 
  long 
  terminal 
  pieces 
  

   which 
  are 
  bifid 
  at 
  the 
  end 
  and 
  with 
  a 
  serrated 
  edge. 
  

   Further, 
  sexually 
  mature 
  examples 
  have 
  after 
  segment 
  viii. 
  

   a 
  tuft 
  of 
  delicate 
  capillary 
  bristles 
  which 
  spring 
  from 
  the 
  

   posterior 
  base 
  of 
  the 
  setigerous 
  process. 
  

  

  Mr. 
  Moore 
  refers 
  the 
  foregoing 
  form 
  to 
  the 
  Syllidse, 
  and 
  

   thinks 
  that 
  it 
  may 
  be 
  the 
  species 
  referred 
  to 
  by 
  Verrill 
  as 
  

   having 
  been 
  taken 
  at 
  Woods 
  Holl 
  along 
  with 
  S. 
  setosa 
  *, 
  and 
  

   is 
  perhaps 
  the 
  S. 
  longicirrata, 
  CErsted, 
  of 
  Webster 
  and 
  Bene- 
  

   dict, 
  but 
  is 
  not 
  that 
  species 
  as 
  described 
  by 
  European 
  authors. 
  

   From 
  typical 
  species 
  of 
  the 
  genus 
  he 
  points 
  out 
  that 
  it 
  differs 
  

   in 
  the 
  small 
  size 
  and 
  ventral 
  position 
  of 
  the 
  palpi. 
  

  

  Mr. 
  Moore's 
  careful 
  description 
  demonstrates 
  the 
  grounds 
  

   on 
  which 
  the 
  resemblances 
  to 
  the 
  Syllids 
  are 
  based, 
  yet 
  there 
  

   is 
  another 
  group 
  with 
  which 
  it 
  might 
  be 
  compared, 
  viz. 
  the 
  

   Staurocephalidae. 
  The 
  head 
  (prostomium) 
  is 
  somewhat 
  like 
  

   that 
  of 
  Autotylus 
  or 
  Myrianida, 
  with 
  a 
  median 
  and 
  two 
  

   lateral 
  tentacles, 
  the 
  eyes 
  being 
  arranged 
  like 
  those 
  of 
  the 
  

   Syllids 
  and 
  Staurocephalus, 
  the 
  anterior 
  rudimentary 
  pair 
  

   being, 
  however, 
  peculiar. 
  The 
  absence 
  of 
  a 
  median 
  tentacle 
  

   in 
  Staurocephalus 
  is 
  a 
  divergence, 
  but 
  in 
  some 
  Stauro- 
  

   cephalids 
  the 
  tentacles 
  are 
  more 
  or 
  less 
  ringed. 
  The 
  body 
  

   offers 
  little 
  that 
  is 
  diagnostic 
  in 
  general 
  outline, 
  but 
  the 
  

   caudal 
  region 
  has 
  a 
  pygidium 
  with 
  a 
  short 
  median 
  style, 
  as 
  

   well 
  as 
  two 
  long 
  lateral 
  cirri, 
  features 
  diverging 
  from 
  the 
  

   Staurocephalids, 
  which 
  usually 
  have 
  only 
  the 
  lateral 
  cirri. 
  

   The 
  structure 
  of 
  the 
  foot 
  is, 
  perhaps, 
  the 
  most 
  critical 
  feature 
  

   in 
  the 
  comparison. 
  In 
  Mr. 
  Moore's 
  form 
  the 
  foot 
  is 
  strictly 
  

   uniramous 
  on 
  the 
  first 
  seven 
  bristled 
  segments 
  in 
  sexually 
  

   mature 
  forms 
  and 
  in 
  all 
  the 
  segments 
  in 
  the 
  immatuie 
  

   annelids. 
  In 
  all 
  ordinary 
  Syllids 
  the 
  foot 
  conforms 
  to 
  the 
  

   uniramous 
  type, 
  having 
  only 
  a 
  single 
  spine 
  and 
  bristles 
  of 
  

   one 
  character, 
  the 
  ventral 
  cirrus 
  often 
  being 
  fused 
  wifh 
  the 
  

   lower 
  border 
  of 
  the 
  setigerous 
  process, 
  which 
  usually 
  has 
  a 
  

   different 
  outline 
  from 
  that 
  in 
  Syllides 
  verrilli. 
  In 
  the 
  

   Staurocephalidae 
  the 
  foot, 
  on 
  the 
  other 
  hand, 
  though 
  there 
  

   is 
  but 
  one 
  spine, 
  shows 
  a 
  biramous 
  tendency 
  in 
  so 
  far 
  as 
  the 
  

   bristles 
  are 
  in 
  two 
  tufts, 
  and 
  the 
  upper 
  dorsal 
  bristles 
  diverge 
  

   in 
  structure 
  from 
  the 
  others, 
  and, 
  in 
  all, 
  the 
  ventral 
  cirrus 
  is 
  

   carried 
  far 
  out 
  on 
  the 
  setigerous 
  process. 
  

  

  To 
  go 
  more 
  minutely 
  into 
  the 
  structure 
  of 
  the 
  foot 
  of 
  

   Syllides 
  verrilli, 
  the 
  dorsal 
  cirrus 
  is 
  proportionally 
  massive 
  

  

  * 
  Rep. 
  U.S. 
  Fish. 
  Comrn. 
  for 
  1832 
  (1884), 
  p. 
  664, 
  footnote. 
  

  

  10* 
  

  

  