﻿ECHIIHOID 
  WOKMS 
  OF 
  NORTH 
  PACIFIC 
  — 
  FISHER 
  257 
  

  

  ciliated 
  grroove) 
  has 
  very 
  thin 
  walls 
  and 
  very 
  compact 
  pellets 
  (j)!. 
  28, 
  

   fi^. 
  4). 
  The 
  ciliated 
  groove 
  entls 
  at 
  entrance 
  to 
  small 
  cloaca! 
  bulb 
  and 
  

   a 
  strand 
  of 
  tissue 
  from 
  the 
  ventral 
  blood 
  vessel 
  is 
  attached 
  at 
  this 
  

   point. 
  

  

  The 
  vascular 
  system 
  is 
  of 
  the 
  usual 
  bonelliid 
  type 
  and 
  can 
  be 
  fol- 
  

   lowed 
  in 
  the 
  fi«rure. 
  The 
  ventral 
  vessel 
  divides 
  into 
  two 
  at 
  about 
  the 
  

   point 
  where 
  setae 
  would 
  be 
  if 
  present. 
  

  

  The 
  ^ronad, 
  in 
  the 
  usual 
  bonelliid 
  position, 
  is 
  confined 
  to 
  the 
  median 
  

   third 
  of 
  the 
  body 
  and 
  is 
  inactive, 
  there 
  being: 
  no 
  sig:n 
  of 
  egg 
  formation. 
  

   In 
  Xdlobia, 
  dretlged 
  at 
  the 
  same 
  time, 
  the 
  gonads 
  were 
  active 
  and 
  the 
  

   nephridium 
  full 
  of 
  eggs. 
  

  

  Male 
  (pi. 
  28, 
  fig. 
  5). 
  One 
  was 
  found 
  in 
  the 
  pharynx 
  near 
  mouth. 
  

   It 
  is 
  possibly 
  not 
  fully 
  matured; 
  length 
  1.17 
  mm. 
  The 
  dark 
  body 
  is 
  

   the 
  spenn 
  vesicle, 
  the 
  duct 
  opening 
  at 
  the 
  anterior 
  end 
  as 
  in 
  Bonellia 
  

   nridis. 
  The 
  small 
  spot 
  back 
  of 
  the 
  gonad 
  is 
  probably 
  the 
  excretory 
  

   pore. 
  Small 
  indistinct 
  masses 
  of 
  spermatozoa 
  can 
  be 
  seen 
  in 
  the 
  

   coelom, 
  but 
  have 
  not 
  been 
  shown 
  in 
  the 
  drawing. 
  The 
  gonad 
  is 
  situ- 
  

   ated 
  more 
  posteriorly 
  than 
  in 
  Bonellia 
  viridis. 
  

  

  Type—V.S.K.M. 
  No. 
  20604. 
  

  

  Type 
  locality. 
  — 
  Albatross 
  station 
  5021, 
  Okhotsk 
  Sea, 
  off 
  east 
  coast 
  

   of 
  Sakhalin 
  Island, 
  lat. 
  48° 
  32' 
  30'' 
  N., 
  long. 
  145° 
  08' 
  45" 
  E., 
  73 
  

   fathoms, 
  green 
  mud, 
  sand, 
  pebbles, 
  bottom 
  temperature 
  30.9° 
  F. 
  

  

  NELLOBIA, 
  '» 
  new 
  genus 
  

  

  Diagnosis. 
  — 
  Bonelliidae 
  without 
  setae 
  and 
  possibly 
  without 
  probos- 
  

   cis; 
  one 
  nephridium 
  (.left), 
  with 
  a 
  basal 
  ncphrostome 
  and 
  swollen 
  

   basal 
  region, 
  opening 
  in 
  the 
  median 
  line 
  but 
  without 
  a 
  genital 
  groove; 
  

   two 
  compoand 
  anal 
  vesicles 
  each 
  consisting 
  of 
  numerous 
  trees 
  aris- 
  

   ing 
  from 
  a 
  sessile 
  receptacle 
  on 
  either 
  side 
  of 
  the 
  very 
  large 
  muscular 
  

   cloaca; 
  terminal 
  portion 
  of 
  hind-gut 
  greatly 
  enlarged; 
  body 
  wall 
  very 
  

   thick. 
  

  

  Tvj)e, 
  Nellobia 
  eusoma, 
  new 
  species. 
  

  

  Remarks. 
  — 
  This 
  genus 
  differs 
  from 
  Bonellia, 
  Protobonellia, 
  Para- 
  

   bonellia, 
  Eubonellia, 
  and 
  BoncUiopsis 
  in 
  the 
  radically 
  different 
  struc- 
  

   tun; 
  of 
  the 
  aral 
  vesicles 
  and 
  from 
  all 
  bonelliids 
  in 
  the 
  extremely 
  large 
  

   muscular 
  cloaca 
  and 
  enlarged 
  terminal 
  part 
  of 
  the 
  hind-gut. 
  The 
  

   only 
  group 
  which 
  hns 
  fundamentally 
  similar 
  anal 
  vcsi<'les 
  is 
  Acan- 
  

   thohamln(}ia 
  Ikeda 
  ^ 
  in 
  which 
  three 
  trees 
  arise 
  indei)(!ndently 
  on 
  each 
  

   side 
  of 
  the 
  cloaca 
  {A. 
  ijimai) 
  or 
  more 
  ninnerously 
  as 
  o 
  cluster 
  with 
  

   probiibly 
  some 
  coiuiectif)n 
  between 
  the 
  elements 
  {A. 
  shiplei). 
  In 
  

   Ilaminf/ia 
  arctica 
  Danielssen 
  and 
  Koren 
  *' 
  there 
  is 
  a 
  very 
  short 
  (1 
  mm.) 
  

  

  " 
  Anneram 
  of 
  litmf.Uia. 
  

  

  '^ 
  Ikpiln, 
  lOlO, 
  p. 
  l.Tfi, 
  1)1. 
  10; 
  !kH> 
  also 
  lOOH, 
  p. 
  01, 
  pi. 
  I. 
  

  

  •1 
  Danlflsson 
  an<l 
  Korfn, 
  IhHI, 
  p. 
  '.!n, 
  [il 
  4 
  uml 
  .'.. 
  lU'". 
  1-1H. 
  

  

  