﻿442 
  PROCEEDINGS 
  OF 
  THE 
  XATIONAL 
  MUSEUM 
  

  

  meiit, 
  0.8; 
  breadth 
  of 
  posterior 
  segment, 
  0.38. 
  The 
  segments 
  begin 
  as 
  

   fine 
  transverse 
  stria', 
  immediately 
  behind 
  the 
  head. 
  J>othria 
  with 
  ten 
  

   loenli 
  arranged 
  in 
  Ibnr 
  pairs 
  with 
  a 
  single 
  one 
  at 
  each 
  extremity. 
  

   Tbe 
  bothria 
  are 
  attached 
  by 
  short 
  pedicels 
  near 
  tlieir 
  posterior 
  ends, 
  

   their 
  anterior 
  ends 
  projecting 
  in 
  front, 
  giving 
  the 
  head 
  the 
  appear- 
  

   ance 
  of 
  a 
  four-petaled 
  flower. 
  Some 
  of 
  the 
  free 
  segments, 
  probably 
  

   belonging 
  to 
  this 
  species, 
  were 
  much 
  longer 
  than 
  broad 
  ; 
  length, 
  2.7 
  mm. 
  ; 
  

   breadth, 
  0.37. 
  

  

  These 
  specimens 
  agree 
  with 
  Beneden's 
  description 
  and 
  figures 
  of 
  

   E. 
  mini 
  mum. 
  

  

  25. 
  SPONGIOBOTHRIUM 
  VARIABILE 
  Linton. 
  

  

  Sj)onf/iohothriiim 
  variabile 
  LiXTox, 
  U. 
  S. 
  Fish 
  Com. 
  Kept., 
  1886, 
  pp. 
  462-461, 
  pi. 
  ir^ 
  

   figs. 
  13-19; 
  1887, 
  pp. 
  778-780. 
  

  

  Xos. 
  4807, 
  480C), 
  U.S.N.M. 
  Three 
  finds 
  of 
  this 
  S])ecies 
  have 
  been 
  

   made 
  since 
  the 
  report 
  of 
  18S7 
  ; 
  each 
  in 
  the 
  sting 
  ray 
  {Dasyatiti 
  cenfritra); 
  

   all 
  at 
  Woods 
  Holl, 
  Massachusetts, 
  in 
  1889. 
  

  

  1. 
  July 
  18; 
  one 
  specimen; 
  length, 
  91 
  mm. 
  ; 
  bothria 
  exceedingly 
  vari- 
  

   able, 
  extending 
  to 
  1 
  mm. 
  or 
  more. 
  The 
  appearance 
  of 
  the 
  bothria 
  was 
  

   somewhat 
  different 
  from 
  what 
  I 
  had 
  previously 
  observed 
  in 
  this 
  ,s])ecies. 
  

   The 
  bothria 
  are 
  flat, 
  thin, 
  and 
  very 
  flexible, 
  surrounded 
  by 
  a 
  finely 
  

   crenulate 
  mus(;ular 
  border 
  and 
  mounted 
  on 
  i)edicels, 
  the 
  latter 
  being 
  

   very 
  flexible. 
  The 
  bothria 
  become 
  much 
  crumpled 
  and 
  the 
  pedicels 
  

   greatly 
  shortened 
  as 
  the 
  worm 
  contracts. 
  When 
  first 
  removed 
  and 
  

   placed 
  in 
  sea 
  water 
  the 
  bothria 
  resemble 
  those 
  of 
  Anthocephahim 
  (jraclle 
  

   Linton, 
  but 
  there 
  is 
  no 
  auxiliary 
  acetabulum. 
  The 
  mature 
  segments 
  

   measured 
  7 
  mm. 
  in 
  length 
  and 
  0.9 
  in 
  breadth. 
  

  

  2. 
  July 
  24; 
  one 
  specimen. 
  The 
  edges 
  of 
  the 
  bothria 
  were 
  very 
  ver- 
  

   satile 
  in 
  life, 
  extending 
  into 
  flexible 
  digitate 
  projections 
  when 
  first 
  

   placed 
  in 
  sea 
  water. 
  

  

  3. 
  August 
  T); 
  one 
  specimen, 
  with 
  numerous 
  free 
  proglottides; 
  the 
  

   latter 
  plump 
  and 
  swollen. 
  The 
  neck 
  was 
  coiled 
  in 
  a 
  close 
  spiral 
  in 
  life, 
  

   which 
  imparted 
  a 
  very 
  deceptive 
  appearance 
  to 
  the 
  specimen. 
  One 
  

   specimen, 
  belonging 
  to 
  the 
  lot 
  collected 
  July 
  18 
  and 
  placed 
  at 
  tlie 
  time 
  

   of 
  collecting 
  with 
  two 
  specimens 
  of 
  PiiraUvnia 
  medusia, 
  proves 
  to 
  be 
  an 
  

   immature 
  iSjioiigiohothrium 
  rttriablle. 
  It 
  was 
  at 
  first 
  taken 
  to 
  be 
  a 
  speci- 
  

   men 
  of 
  Parafani<(, 
  although 
  a 
  little 
  larger 
  than 
  the 
  other 
  specimens 
  in 
  

   the 
  vial, 
  and 
  had 
  a 
  broad 
  top-shaped 
  head, 
  which, 
  when 
  examined 
  

   closely 
  was 
  seen 
  to 
  lack 
  bothria, 
  while 
  the 
  retracted 
  part 
  was 
  a 
  folded 
  

   plicated 
  organ 
  looking, 
  in 
  this 
  condition, 
  not 
  nnlike 
  the 
  characteristic 
  

   tentacles 
  of 
  Faratfvnia. 
  The 
  segments 
  resemble 
  those 
  of 
  Spongiohoth- 
  

   riiim; 
  the 
  first 
  very 
  short, 
  becoming 
  as 
  long 
  as 
  bi'oad, 
  then 
  roundish, 
  

   moniliform, 
  and 
  then 
  longer 
  than 
  bioad. 
  

  

  Dimensions: 
  Length, 
  about 
  4 
  mm.; 
  breadth 
  of 
  liead, 
  0.5; 
  length 
  ot 
  

   head, 
  0.33; 
  breadth 
  of 
  neck, 
  0.1; 
  length 
  of 
  last 
  segment, 
  0.3; 
  breadth 
  

   of 
  last 
  segment, 
  0.14. 
  

  

  