﻿324 
  Transactions. 
  — 
  -Zonlogij, 
  

  

  C. 
  BicoLOB, 
  Schmarda, 
  I.e., 
  p. 
  21, 
  j^l- 
  20,/. 
  169. 
  Qaat., 
  I.e., 
  I., 
  p. 
  477. 
  

  

  Segments 
  60 
  ; 
  body 
  rounded, 
  attenuated 
  behind, 
  greyish-yellow, 
  anterior 
  

   portion 
  blue 
  ; 
  the 
  whole 
  surface 
  covered 
  with 
  a 
  hyaline 
  jelly 
  ; 
  upper 
  bundles 
  

   of 
  bristles 
  4-haired 
  ; 
  the 
  lower 
  ¥/ith 
  hooked 
  setse. 
  

  

  Genus 
  Siphonostomuni, 
  Grube. 
  

   Head 
  distinct 
  ; 
  body 
  naked, 
  attenuated 
  behind 
  ; 
  feet 
  with 
  sinaple 
  bristles 
  

   on 
  both 
  feet. 
  

  

  S. 
  ANTARCTicuM, 
  Baiixl, 
  P.L.8., 
  XI., 
  p. 
  95. 
  

  

  Set® 
  surrounding 
  the 
  head 
  numerous, 
  very 
  short 
  and 
  fine 
  ; 
  branchiae 
  

   short, 
  numerous 
  ; 
  body 
  covered 
  with 
  an 
  enveloping 
  substance 
  like 
  that 
  of 
  

   most 
  of 
  the 
  known 
  species 
  (shaggy). 
  Sette 
  of 
  the 
  inferior 
  ramus 
  of 
  feet 
  

   single, 
  crooked 
  or 
  hooked 
  at 
  the 
  point, 
  and 
  of 
  nearly 
  a 
  black 
  colour. 
  

   Colour 
  of 
  body 
  varying 
  from 
  a 
  very 
  dark 
  to 
  a 
  light 
  brown, 
  and 
  of 
  a 
  trans- 
  

   parent 
  look. 
  Length 
  of 
  longest 
  specimen 
  nearly 
  three 
  inches. 
  

  

  Family 
  Hermellid^. 
  

   Tubiculous 
  ; 
  segments 
  of 
  two 
  or 
  three 
  kinds, 
  the 
  hinder 
  thread-like 
  

   with 
  no 
  appendages 
  ; 
  head 
  lobes 
  fleshy, 
  with 
  a 
  circlet 
  of 
  yellow 
  palese 
  on 
  

   the 
  prostomial 
  border, 
  which 
  acts 
  as 
  an 
  operculum 
  ; 
  tube 
  built 
  up 
  of 
  

   cemented 
  shells. 
  

  

  Genus 
  Pallasia, 
  Quatrefages. 
  

   Tentacles 
  joined 
  upon 
  the 
  upper 
  face 
  ; 
  operculum 
  formed 
  by 
  two 
  con- 
  

   centric 
  rows 
  of 
  setse 
  ; 
  body 
  divided 
  into 
  three 
  regions. 
  

  

  P. 
  QUADRicoENis, 
  Sclimanla, 
  I.e., 
  p. 
  25, 
  jjL 
  20,/. 
  174 
  (Hermella). 
  Qaat., 
  I.e., 
  

  

  II., 
  p. 
  324. 
  

   Body 
  reddish-yellow 
  ; 
  head 
  and 
  branchiae 
  violet 
  ; 
  dorsal 
  branchiffi 
  blue 
  ; 
  

   papillaB 
  short 
  ; 
  external 
  palege 
  aculeate 
  at 
  the 
  sides 
  ; 
  internal 
  geniculate, 
  

   aculeate 
  ; 
  occipital 
  spines 
  four. 
  

  

  Family 
  Terebellidje. 
  

   Inhabiting 
  soft, 
  fragile 
  tubes 
  ; 
  body 
  with 
  two 
  distinct 
  regions 
  ; 
  head 
  

   without 
  pale^ 
  and 
  lobes, 
  but 
  with 
  large, 
  moveable, 
  ciliated, 
  branchise, 
  

   serving 
  as 
  touch- 
  and 
  prehensile-organs. 
  

  

  Genus 
  Terebella, 
  Linnteus. 
  

   Three 
  pairs 
  of 
  arborescent 
  branchise. 
  

  

  T. 
  PLAGiosTOMA, 
  Schmarcla, 
  I.e., 
  p. 
  41, 
  pi. 
  24,/. 
  196. 
  Quat., 
  I.e., 
  II., 
  p. 
  366. 
  

   Body 
  reddish-yellow; 
  cephalic 
  branchi^ 
  pale, 
  short 
  ; 
  laterals 
  cinnabar- 
  

   red, 
  short 
  ; 
  pinnulse 
  in 
  the 
  last 
  segment 
  ; 
  mouth 
  transverse. 
  

  

  T. 
  heteeobranchia, 
  Schnarda, 
  I.e., 
  p. 
  42, 
  pi. 
  24,/. 
  197. 
  Quat., 
  I.e., 
  II., 
  p. 
  366. 
  

   Body 
  yellowish-grey 
  ; 
  cephalic 
  branchise 
  clear 
  ; 
  first 
  lateral 
  branchia, 
  

   consisting 
  of 
  many 
  equal 
  branches, 
  the 
  others 
  with 
  one 
  branch 
  longer 
  ; 
  

   mouth 
  obsolete 
  quadrangular 
  ; 
  pinnulae, 
  

  

  