﻿Ko.n2r>. 
  ' 
  CESTODE 
  PARASITES 
  OF 
  FISHES— 
  LIXrON. 
  435 
  

  

  Ninnerons 
  fragments, 
  not 
  in 
  good 
  state 
  of 
  preservation; 
  some 
  of 
  the 
  

   strobiles 
  have 
  evidently 
  been 
  long. 
  Heads 
  of 
  diverse 
  shapes. 
  A 
  few 
  

   dimensions 
  follo\Y: 
  Length 
  of 
  head 
  and 
  neck, 
  0.8 
  mm.; 
  breadth 
  of 
  

   head, 
  0.45; 
  breadth 
  of 
  neck, 
  0.38; 
  lirst 
  segments 
  broader 
  than 
  long; 
  

   length 
  of 
  head 
  proper, 
  0.45; 
  length 
  of 
  head 
  and 
  neck 
  of 
  another. 
  0.0; 
  

   diameter, 
  0,35; 
  diameter 
  of 
  neck, 
  0.3; 
  length 
  of 
  head 
  proper, 
  O.G; 
  first 
  

   segments 
  as 
  long 
  or 
  longer 
  than 
  broad. 
  

  

  A 
  curiously 
  tangled 
  mass 
  of 
  strobiles 
  abont 
  8 
  mm. 
  in 
  length 
  and 
  4 
  in 
  

   breadth 
  occurred 
  in 
  this 
  lot. 
  It 
  appeared 
  to 
  be 
  made 
  np 
  of 
  the 
  ends 
  of 
  

   probably 
  a 
  dozen 
  or 
  more 
  strobiles. 
  One 
  strobile 
  which 
  protrnded 
  about 
  

   12 
  ram. 
  from 
  the 
  mass 
  was 
  separated 
  from 
  it. 
  The 
  part 
  that 
  had 
  par- 
  

   taken 
  m 
  the 
  entanglement 
  was 
  found 
  to 
  be 
  about 
  4 
  mm. 
  in 
  length, 
  very 
  

   slender 
  and 
  irregular 
  in 
  outline 
  from 
  pressure. 
  The 
  fore 
  part 
  was 
  2 
  

   mm. 
  in 
  diameter; 
  the 
  part 
  that 
  had 
  been 
  woven 
  in 
  the 
  mass, 
  0.5 
  mm. 
  in 
  

   diameter. 
  The 
  end 
  of 
  the 
  slender 
  part 
  was 
  slightly 
  enlarged. 
  This 
  was 
  

   characteristic 
  of 
  the 
  other 
  pieces 
  that 
  made 
  up 
  the 
  mass. 
  The 
  slender 
  

   portion 
  Avas 
  at 
  the 
  posterior 
  end 
  of 
  the 
  larger 
  fragment. 
  All 
  in 
  this 
  lot 
  

   had 
  distinct 
  necks. 
  

  

  15. 
  DIBOTHRIUM 
  LACINIATUM, 
  new 
  species. 
  

   (Plates 
  XXX, 
  tigs. 
  7-16; 
  XXXI, 
  figs. 
  1-7.) 
  

  

  Type. 
  — 
  l^o. 
  4741, 
  U.S.N. 
  M. 
  From 
  tarpum 
  {Tarpon 
  allanticns). 
  

  

  Two 
  specimens, 
  142 
  and 
  154 
  mm. 
  in 
  length, 
  respectively. 
  Largest 
  

   specimen 
  about 
  4 
  mm. 
  broad 
  at 
  broadest 
  place, 
  near 
  middle, 
  from 
  which 
  

   point 
  it 
  tapers 
  to 
  about 
  2 
  at 
  posterior 
  end. 
  

  

  Head 
  clavate, 
  outline 
  varying 
  with 
  state 
  of 
  contraction, 
  truncate 
  and 
  

   somewhat 
  four-lobed 
  in 
  front. 
  Fossettes 
  marginal 
  as 
  to 
  head, 
  corre- 
  

   sponding 
  to 
  flat 
  surface 
  of 
  body. 
  Flat 
  surfaces 
  of 
  head 
  with 
  profound 
  

   median 
  depression 
  at 
  apex 
  and 
  extending 
  posteriorly 
  about 
  half 
  length 
  

   of 
  head. 
  These 
  depressions, 
  with 
  the 
  fossettes 
  (bothria), 
  give 
  the 
  front 
  

   aspe(;tof 
  the 
  head 
  a 
  four-lobed 
  appearance. 
  Head 
  contracted 
  near 
  the 
  

   base 
  with 
  salient 
  posterior 
  margin; 
  fossettes 
  extend 
  posteriorly 
  to 
  con- 
  

   striction. 
  Segments 
  begin 
  immediately 
  behind 
  the 
  head. 
  First 
  funnel- 
  

   shaped 
  with 
  salient 
  posterior 
  border. 
  The 
  salient 
  posterior 
  border 
  of 
  

   head 
  and 
  of 
  the 
  first 
  segments 
  have 
  a 
  distinct 
  emargiuation 
  on 
  the 
  

   middle 
  of 
  the 
  border 
  which 
  lies 
  on 
  the 
  flat 
  surface 
  of 
  the 
  body. 
  This 
  

   emarginate 
  character 
  is 
  \Qvy 
  distinct 
  in 
  the 
  first 
  segments, 
  but 
  becomes 
  

   indistinct 
  in 
  the 
  median 
  segments. 
  The 
  median 
  segments 
  are 
  much 
  

   crowded, 
  breadth 
  as 
  much 
  as 
  ten 
  times 
  the 
  length; 
  posterior 
  segments 
  

   with 
  breadth 
  one 
  and 
  a 
  half 
  times 
  the 
  length. 
  

  

  Body 
  very 
  rugose, 
  due 
  to 
  the 
  piominent 
  thin 
  posteriin- 
  edges 
  of 
  the 
  

   segments. 
  The 
  segments 
  are 
  not 
  uniform; 
  one 
  segment 
  with 
  a 
  salient 
  

   posterior 
  l)order 
  followed 
  by 
  about 
  two 
  with 
  less 
  salient 
  borders. 
  

  

  Further 
  dimensions 
  : 
  Length 
  of 
  head, 
  2 
  mm. 
  ; 
  breadth 
  of 
  head, 
  anterior, 
  

   0.8; 
  middle, 
  0.4; 
  posterior, 
  O.G; 
  at 
  constriction, 
  0.25; 
  thickness 
  of 
  head, 
  

   anterior, 
  0.5; 
  middle, 
  0.55; 
  at 
  constriction, 
  0.25; 
  posterior, 
  0.35; 
  length 
  

  

  