﻿432 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  The 
  worms 
  were 
  collected 
  on 
  March 
  15, 
  when 
  they 
  were' 
  still 
  active. 
  

   There 
  were 
  one 
  hundred 
  and 
  nine 
  specimens 
  in 
  all; 
  twenty-three 
  were 
  

   found 
  on 
  the 
  viscera 
  and 
  in 
  the 
  stomach; 
  twenty-six 
  in 
  pyloric 
  c(jeca; 
  

   ten 
  in 
  pylorus, 
  and 
  fifty 
  in 
  spiral 
  intestine. 
  Only 
  the 
  viscera 
  had 
  been 
  

   brought 
  to 
  the 
  laboratory. 
  It 
  is 
  likely, 
  therefore, 
  that 
  the 
  spocinu-ns 
  

   which 
  were 
  found 
  on 
  the 
  viscera 
  had 
  escai)ed 
  from 
  the 
  stomach 
  alter 
  

   the 
  viscera 
  had 
  been 
  taken 
  from 
  the 
  host. 
  Two 
  pits 
  were 
  found 
  ex(;a- 
  

   vatedin 
  the 
  mucous 
  and 
  submucous 
  layers 
  of 
  the 
  i)ylorus 
  near 
  the 
  spiral 
  

   valve, 
  in 
  which 
  the 
  heads 
  of 
  a 
  number 
  of 
  Dibotliria 
  were 
  inseited. 
  The 
  

   color 
  was 
  at 
  first 
  lemon-yellow; 
  after 
  lying 
  in 
  water 
  for 
  a 
  few 
  minutes 
  

   the 
  bodies 
  became 
  colorless 
  or 
  faintly 
  bluish 
  translucent, 
  while 
  the 
  heads 
  

   remained 
  yellowish. 
  Length 
  of 
  most 
  of 
  the 
  specimens, 
  when 
  first 
  

   removed, 
  from 
  25 
  to 
  35 
  mm.; 
  a 
  few 
  were 
  a 
  little 
  longer 
  than 
  tliis. 
  

   After 
  lying 
  in 
  water 
  for 
  an 
  hour 
  four 
  of 
  the 
  larger 
  specimens 
  measured 
  

   48, 
  GO, 
  73 
  and 
  78 
  mm. 
  in 
  lengths, 
  respectively. 
  The 
  specimens 
  were 
  at 
  

   first 
  very 
  active, 
  the 
  lateral 
  pits 
  and 
  the 
  heads 
  themselves 
  changing 
  

   their 
  shape 
  incessantly. 
  

  

  A 
  specimen 
  that 
  had 
  lain 
  in 
  water 
  about 
  an 
  hour, 
  the 
  bead 
  being 
  quiet, 
  

   was 
  measured 
  and 
  the 
  following 
  dimensions 
  noted: 
  Length, 
  00 
  mm.; 
  

   length 
  of 
  head, 
  2.75; 
  breadth 
  of 
  head 
  at 
  base, 
  2; 
  breadth 
  of 
  head 
  near 
  

   apex, 
  1.8; 
  length 
  of 
  pit, 
  l.G; 
  diameter 
  of 
  pit, 
  0.8; 
  breadth 
  of 
  neck 
  near 
  

   head, 
  11; 
  length 
  of 
  last 
  segments 
  (average 
  of 
  tifteen), 
  1.13; 
  breadth 
  of 
  

   last 
  segments, 
  2. 
  

  

  Head 
  sagittate 
  (when 
  at 
  rest 
  and 
  contracted), 
  terminated 
  anteriorly 
  

   with 
  a 
  button-shaped 
  tip 
  which 
  is 
  bluntly 
  rounded 
  in 
  front 
  and 
  marked 
  

   off 
  from 
  remainder 
  of 
  head 
  by 
  slight 
  constriction, 
  in 
  life 
  angled 
  pos- 
  

   teriorly; 
  pits 
  variable 
  in 
  life 
  but 
  usually 
  elliptical, 
  often 
  with 
  anterior 
  

   margin 
  acuminate 
  and 
  sometimes 
  with 
  posterior 
  margin 
  indistinct. 
  

   The 
  head 
  is 
  angled 
  posteriorly 
  both 
  laterally 
  and 
  marginally, 
  present- 
  

   ing 
  a 
  quite 
  characteristic 
  appearance 
  in 
  the 
  living 
  worm. 
  i!^eck 
  sub- 
  

   cylindrical, 
  narrower 
  than 
  head. 
  The 
  segments 
  begin 
  some 
  distance 
  

   (6 
  or 
  8 
  mm.) 
  back 
  of 
  the 
  head, 
  as 
  faint 
  transverse 
  lines. 
  The 
  first 
  dis- 
  

   tinct 
  segments 
  are 
  closely 
  crowded, 
  much 
  broader 
  than 
  long, 
  median 
  seg- 
  

   ments 
  squarish, 
  posterior 
  segments 
  usually 
  a 
  little 
  longer 
  than 
  broad, 
  

   rectangular, 
  apparently 
  separating 
  rather 
  easily. 
  The 
  specimens 
  were 
  

   all 
  young, 
  so 
  that 
  the 
  character 
  of 
  the 
  ripe 
  proglottides 
  could 
  not 
  be 
  

   made 
  out. 
  Posterior 
  angles 
  of 
  the 
  segments 
  slightly 
  projecting. 
  Geni- 
  

   tal 
  apertures 
  on 
  lateral 
  margins, 
  a 
  little 
  in 
  front 
  of 
  the 
  middle; 
  a 
  zigzag 
  

   line 
  of 
  minute 
  pores 
  traverses 
  the 
  median 
  region 
  of 
  one 
  of 
  the 
  broad 
  

   faces 
  of 
  the 
  strobile, 
  each 
  pore 
  being 
  near 
  the 
  middle 
  of 
  its 
  segment. 
  

  

  Outline 
  of 
  most 
  of 
  the 
  strobiles 
  nearly 
  linear 
  and 
  about 
  the 
  same 
  

   breadth 
  as 
  the 
  head. 
  All 
  the 
  segments 
  were 
  remarkably 
  regular 
  in 
  

   outline, 
  no 
  irregularities 
  being 
  observed. 
  

  

  In 
  the 
  United 
  States 
  National 
  Museum 
  collection 
  there 
  is 
  one 
  lot 
  of 
  

   specimens 
  belonging 
  to 
  this 
  species, 
  No. 
  4783, 
  from 
  Folyodon 
  spathula 
  ; 
  

   C. 
  H. 
  Gilbert, 
  collector, 
  1885 
  ; 
  eight 
  specimens 
  in 
  lot. 
  The 
  strobiles 
  

   are 
  older 
  than 
  those 
  in 
  the 
  lot 
  collected 
  by 
  myself. 
  Three 
  of 
  them 
  bore 
  

  

  