﻿80 
  E. 
  J. 
  ALLEN. 
  

  

  Historical. 
  

  

  ClaparedE; 
  in 
  his 
  ' 
  Beobachtinigeu 
  iiber 
  Anatomic 
  unci 
  

   Entvvicklungsgeschiclite 
  wirbelloser 
  Thiere 
  an 
  der 
  Kiiste 
  

   von 
  Norinandie 
  Angestellt/ 
  published 
  in 
  1863, 
  describes 
  and 
  

   figures 
  (pp. 
  77 
  — 
  80, 
  Taf. 
  vi, 
  tigs. 
  ] 
  — 
  11) 
  several 
  stages 
  in 
  the 
  

   development 
  of 
  an 
  annelid 
  larva, 
  which 
  he 
  was 
  unable 
  at 
  the 
  

   time 
  to 
  assign 
  to 
  any 
  known 
  genus. 
  This 
  larva 
  was 
  very 
  

   common 
  in 
  the 
  plankton 
  at 
  St. 
  Vaast, 
  and 
  the 
  same, 
  or 
  a 
  very 
  

   similar 
  one, 
  had 
  previously 
  been 
  found 
  (in 
  1855) 
  by 
  Claparede 
  

   on 
  the 
  coast 
  of 
  Norway. 
  He 
  surmised 
  that 
  the 
  larva 
  must 
  

   belong 
  to 
  some 
  common 
  worm 
  at 
  that 
  time 
  still 
  undescribed. 
  

  

  No 
  further 
  advance 
  seems 
  to 
  have 
  been 
  made 
  in 
  the 
  know- 
  

   ledge 
  of 
  this 
  form 
  until 
  the 
  appearance 
  in 
  1874 
  of 
  a 
  report 
  by 
  

   Claparede 
  on 
  the 
  annelids 
  collected 
  by 
  the 
  " 
  Lightning 
  " 
  

   Expedition. 
  This 
  report 
  is 
  contained, 
  in 
  Ehler's 
  paper, 
  

   "Beitrage 
  zur 
  Kenntniss 
  der 
  Verticalverbreitung 
  der 
  Bor- 
  

   stenwiirmer 
  inMeere" 
  (Ehlers, 
  1874). 
  Amongst 
  the 
  material 
  

   collected 
  by 
  the 
  "Lightning," 
  Claparede 
  found 
  a 
  number 
  of 
  

   fragments 
  of 
  a 
  Avorm, 
  which 
  he 
  considered 
  must 
  be 
  the 
  adult 
  

   form 
  of 
  the 
  larva 
  he 
  had 
  previously 
  described. 
  He 
  states 
  

   that 
  the 
  species 
  is 
  represented 
  in 
  the 
  "Lightuing" 
  material 
  

   "par 
  un 
  fragment 
  dans 
  les 
  preparations 
  Nr. 
  15 
  et 
  Nr. 
  24, 
  et 
  par 
  

   tons 
  les 
  fragments 
  inclus 
  dans 
  la 
  preparation 
  Nr. 
  22." 
  The 
  

   localities 
  from 
  which 
  these 
  specimens 
  were 
  obtained 
  are 
  not 
  

   mentioned. 
  In 
  the 
  same 
  paper 
  Ehlers 
  refers 
  to 
  two 
  fragments 
  

   of 
  the 
  worm 
  described 
  by 
  Claparede, 
  which 
  he 
  found 
  amongst 
  

   the 
  material 
  dredged 
  by 
  the 
  " 
  Porcupine." 
  According 
  to 
  the 
  

   table 
  given 
  (loc. 
  cit., 
  p. 
  25), 
  these 
  were 
  dredged 
  on 
  July 
  

   21st, 
  1869, 
  at 
  48° 
  51' 
  N., 
  11^ 
  7' 
  W. 
  (11° 
  9' 
  W.) 
  in 
  725 
  fathoms, 
  

   on 
  a 
  bottom 
  of 
  muddy 
  sand. 
  

  

  From 
  the 
  fragments 
  at 
  his 
  disposal 
  Claparede 
  Avas 
  able 
  to 
  

   give 
  a 
  fair 
  account 
  of 
  the 
  general 
  external 
  features 
  of 
  the 
  

   worm, 
  and 
  to 
  convince 
  himself 
  that 
  it 
  Avas 
  the 
  adult 
  form 
  of 
  

   the 
  larva 
  which 
  he 
  had 
  previously 
  described, 
  or 
  at 
  any 
  rate 
  

   closely 
  allied 
  to 
  the 
  adult 
  of 
  that 
  larva. 
  He 
  gives 
  to 
  the 
  

   worm 
  the 
  name 
  Pee 
  ci 
  loch 
  a? 
  t 
  us 
  fu 
  Igor 
  is, 
  both 
  the 
  generic 
  

  

  