﻿292 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  8« 
  

  

  2, 
  Scleroplax 
  granulata 
  Rathbun, 
  male, 
  X 
  3. 
  

  

  3, 
  Hesperonoe 
  adventor 
  (Skogsberg), 
  type 
  X 
  1. 
  

  

  4, 
  Specimen 
  of 
  U. 
  caupo 
  with 
  slime-tube 
  in 
  place, 
  with 
  the 
  thickening 
  at 
  point 
  of 
  

  

  attachment 
  to 
  body 
  indicated. 
  The 
  worm 
  is 
  shown 
  in 
  characteristic 
  pump- 
  

   ing 
  posture; 
  X 
  3. 
  

  

  5, 
  Characteristic 
  posture 
  while 
  tube 
  is 
  being 
  secreted; 
  tube 
  just 
  begun; 
  entrance 
  

  

  indicated 
  by 
  dots; 
  X 
  1/4. 
  

  

  6, 
  Expression 
  of 
  worm 
  while 
  swallowing 
  slime-tube. 
  

  

  7, 
  Grasping 
  slime-tube 
  at 
  moment 
  of 
  starting 
  to 
  swallow. 
  The 
  proboscis 
  is 
  

  

  holding 
  the 
  posterior 
  edge 
  of 
  tube 
  while 
  a 
  portion 
  is 
  being 
  sucked 
  in 
  on 
  

   ventral 
  side. 
  This 
  step 
  occupies 
  about 
  three 
  seconds. 
  

  

  U. 
  S. 
  BOVERHMENT 
  rRINTIN* 
  OFFlCli 
  l»4« 
  

  

  