﻿280 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  se 
  

  

  worm 
  went 
  back 
  to 
  the 
  bottom 
  of 
  the 
  tube, 
  pmnped 
  vigorously 
  for 
  

   §ome 
  time, 
  and 
  then 
  resumed 
  feeding. 
  During 
  spawning 
  the 
  body 
  of 
  

   the 
  worm 
  was 
  much 
  more 
  elongated 
  than 
  normally. 
  The 
  spawning 
  

   on 
  May 
  24 
  occurred 
  at 
  4:30 
  p. 
  m., 
  that 
  on 
  the 
  following 
  days 
  at 
  9:20 
  

   a. 
  m. 
  Although 
  tae 
  nephridia 
  were 
  emptied 
  the 
  first 
  day 
  of 
  spawning, 
  

   the 
  movements 
  and 
  procedure 
  on 
  the 
  second 
  day 
  were 
  the 
  same 
  as 
  for 
  

   the 
  first 
  spawning, 
  but 
  very 
  little 
  sperm 
  was 
  discharged. 
  

  

  The 
  embryology 
  of 
  Urechis 
  caupo, 
  outside 
  the 
  scope 
  of 
  this 
  paper, 
  

   has 
  been 
  thoroughly 
  described 
  and 
  figured 
  by 
  Dr. 
  W. 
  W. 
  Newby 
  

   (1940). 
  In 
  this 
  paper, 
  which 
  merits 
  the 
  highest 
  praise, 
  the 
  relation 
  

   of 
  the 
  Echiuroidea 
  to 
  other 
  phyla 
  is 
  fully 
  discussed. 
  

  

  ADDENDUM 
  

  

  In 
  1942 
  Dr. 
  Sixten 
  Bock 
  published 
  an 
  important 
  memoir 
  "On 
  

   the 
  Structure 
  and 
  Affinities 
  of 
  * 
  Thalassema' 
  lankesteri 
  Herdman 
  and 
  

   the 
  Classification 
  of 
  the 
  Group 
  Echiuroidea." 
  Owing 
  to 
  delays 
  

   occasioned 
  by 
  the 
  war, 
  it 
  has 
  been 
  possible 
  to 
  incorporate 
  only 
  the 
  

   most 
  important 
  systematic 
  data 
  in 
  the 
  foregoing 
  report, 
  such 
  as 
  the 
  

   new 
  genera 
  Ikedosoma 
  and 
  Maxmulleria. 
  It 
  is 
  to 
  be 
  hoped 
  that 
  

   Dr. 
  Bock 
  will 
  continue 
  his 
  fundamental 
  work 
  and 
  will 
  be 
  able 
  to 
  

   revise 
  the 
  genus 
  Ochetostoma, 
  badly 
  in 
  need 
  of 
  an 
  overhauling. 
  

  

  As 
  Dr. 
  Bock's 
  scheme 
  of 
  classification 
  differs 
  from 
  mine, 
  it 
  is 
  given 
  

   herewith 
  in 
  skeleton 
  form: 
  

  

  Class 
  EcHiuHOiDEA 
  [of 
  phylum 
  Annelida] 
  

   I. 
  Order 
  Echiuroinea, 
  nov. 
  

  

  1. 
  Family 
  Echiuridae 
  Baird, 
  1868. 
  Genera: 
  Echiurus 
  and 
  Urechis. 
  

  

  2. 
  Family 
  Thalassematidae, 
  nov. 
  

  

  a. 
  Subfamily 
  Ikedinae, 
  nov. 
  Genus: 
  Ikeda. 
  

  

  b. 
  Subfamily 
  Thalassematinae, 
  nov. 
  Genera: 
  Thalassema, 
  Ocheto- 
  

  

  stoma 
  (incl. 
  Li 
  stri 
  Globus) 
  , 
  Ikedosoma, 
  Arhynchite. 
  

  

  3. 
  Family 
  Bonelliidae 
  Baird, 
  1868. 
  Genera: 
  Maxmiilleria, 
  Acantho- 
  

  

  hamingia, 
  Archibonellia, 
  Hamingia, 
  Parabonellia, 
  Protobonellia, 
  

   Pseudobonellia, 
  Bonellia. 
  

   JI. 
  Order 
  Saccosomatinea, 
  nov. 
  

  

  1. 
  Family 
  Saccosomatidae 
  Theel, 
  1906. 
  Genus: 
  Saccosoma. 
  

   III. 
  Order 
  Poeobiinea, 
  nov. 
  

  

  1. 
  Family 
  Poeobiidae 
  Heath, 
  1930. 
  Genus: 
  Poeobius. 
  

  

  "The 
  two 
  latter 
  orders 
  comprise 
  each 
  a 
  single 
  species 
  and 
  they 
  

   must 
  be 
  regarded 
  as 
  very 
  aberrant 
  Annelids 
  of 
  somewhat 
  doubtful 
  

   relationship 
  to 
  the 
  true 
  Echiuroids" 
  (p. 
  17). 
  

  

  