﻿15G 
  Prof. 
  M'Intosli's 
  Notes 
  from 
  the 
  

  

  continue 
  to 
  the 
  posterior 
  end, 
  both 
  divisions 
  having 
  a 
  few 
  

   slender 
  tapering 
  bristles, 
  which 
  are 
  more 
  conspicuous 
  than 
  

   in 
  front. 
  So 
  far 
  as 
  observed, 
  the 
  hooks 
  of 
  the 
  dorsal 
  division 
  

   posteriorly 
  are 
  slightly 
  more 
  slender 
  and 
  less 
  curved 
  than 
  

   those 
  in 
  the 
  ventral. 
  

  

  A 
  small 
  form 
  (young 
  ?), 
  dredged 
  off 
  Shetland 
  by 
  Dr. 
  Gwyn 
  

   Jeffreys 
  in 
  1867, 
  presents 
  the 
  peculiarity 
  of 
  having 
  only 
  two 
  

   eyes, 
  and 
  the 
  head 
  shows 
  less 
  of 
  a 
  basal 
  constriction 
  than 
  is 
  

   usual 
  in 
  examples 
  of 
  C. 
  cirratus 
  of 
  the 
  same 
  size. 
  The 
  

   complete 
  tentacles 
  of 
  the 
  fourth 
  segment 
  are 
  of 
  very 
  great 
  

   length, 
  probably 
  reaching 
  in 
  life 
  beyond 
  the 
  tip 
  of 
  the 
  tail, 
  

   which 
  has 
  a 
  ventral 
  papilla 
  similar 
  to 
  that 
  of 
  C. 
  cirratus. 
  

   The 
  tenth 
  foot 
  has 
  dorsally 
  a 
  long 
  slender 
  tuft 
  of 
  finely 
  

   tapered 
  bristles, 
  whilst 
  the 
  ventral 
  bristles 
  are 
  much 
  shorter 
  

   — 
  the 
  flattened 
  tips 
  being 
  expanded 
  like 
  a 
  " 
  bellied 
  " 
  knife, 
  

   and 
  then 
  tapered 
  to 
  a 
  fine 
  point. 
  The 
  hooks 
  by-and-by 
  

   appear 
  in 
  both 
  ventral 
  and 
  dorsal 
  divisions, 
  and 
  their 
  

   shape 
  corresponds 
  with 
  that 
  of 
  the 
  ordinary 
  examples 
  of 
  

   C. 
  cirratus. 
  De 
  St. 
  Joseph 
  * 
  found 
  that 
  in 
  the 
  young 
  of 
  

   C. 
  tentaculatus 
  of 
  12 
  mm. 
  the 
  crotchets 
  appeared 
  in 
  the 
  

   tenth 
  segment 
  ; 
  but 
  the 
  structure 
  of 
  the 
  bristles 
  and 
  hooks 
  

   of 
  this 
  form 
  differ 
  from 
  those 
  of 
  that 
  species, 
  not 
  to 
  allude 
  

   to 
  the 
  structure 
  of 
  the 
  head. 
  Keferstein's 
  Cirrutulus 
  bi- 
  

   oculatus^ 
  differs 
  in 
  the 
  shortness 
  of 
  its 
  tentacles, 
  in 
  the 
  

   structure 
  of 
  the 
  hooks, 
  and 
  in 
  the 
  nature 
  of 
  the 
  caudal 
  

   region, 
  which 
  has 
  two 
  cirri. 
  Too 
  much 
  reliance, 
  however, 
  

   cannot 
  be 
  placed 
  on 
  the 
  representations 
  of 
  the 
  minute 
  struc- 
  

   ture 
  of 
  the 
  bristles 
  at 
  that 
  period. 
  

  

  Dodecaceria 
  concharum, 
  (Est., 
  is 
  common 
  under 
  the 
  roots 
  

   of 
  tangles 
  (Laminaria 
  digitata), 
  especially 
  when 
  these 
  have 
  

   a 
  crust 
  of 
  Lithothamnion 
  beneath 
  them 
  ; 
  occasionally 
  in 
  

   sandstone, 
  as 
  at 
  the 
  West 
  Rocks, 
  St. 
  Andrews. 
  

  

  In 
  this 
  the 
  dull 
  greenish 
  head 
  is 
  more 
  attenuated 
  than 
  the 
  

   rest 
  of 
  the 
  body, 
  the 
  anterior 
  border 
  being 
  rounded, 
  though 
  

   capable 
  of 
  various 
  changes 
  of 
  form. 
  The 
  colour 
  is 
  brownish 
  

   red 
  anteriorly, 
  greenish 
  yellow 
  posteriorly, 
  and 
  streaked 
  

   longitudinally 
  with 
  the 
  red 
  blood-vessel, 
  Some 
  have 
  touches 
  

   of 
  orange. 
  They 
  dye 
  spirit 
  green. 
  The 
  mouth 
  opens 
  a 
  

   little 
  behind 
  the 
  tip 
  inferiorly 
  as 
  a 
  Y-shaped 
  slit 
  in 
  which 
  the 
  

   action 
  of 
  the 
  cilia 
  is 
  marked, 
  and 
  with 
  a 
  considerable 
  amount 
  

   of 
  dark 
  pigment 
  on 
  the 
  lips. 
  The 
  body 
  is 
  about 
  an 
  inch 
  in 
  

  

  * 
  Ann. 
  Sc. 
  Nat. 
  8 
  e 
  ser. 
  t. 
  xvii. 
  p. 
  50. 
  

  

  + 
  Zeitsclir. 
  f. 
  wiss. 
  Zool. 
  Bel. 
  xii. 
  p. 
  121, 
  Taf. 
  x. 
  figs. 
  23-27. 
  

  

  