﻿444 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  28, 
  ORYGMATOBOTHRIUM 
  PAULUM, 
  new 
  species. 
  

   (I'liite 
  XXXIII, 
  ligs. 
  7,8 
  ) 
  

  

  Type. 
  — 
  No. 
  4798, 
  U.S.N. 
  M. 
  From 
  spiral 
  intestiue 
  of 
  the 
  tiger 
  shark 
  

   {Galeocerdo 
  ligrinns 
  Raiiz); 
  Woods 
  HoU, 
  Massachusetts, 
  August 
  14, 
  

   1889; 
  very 
  numerous. 
  

  

  Bothria 
  four, 
  variable 
  in 
  shape 
  from 
  long 
  to 
  short-oval, 
  each 
  with 
  

   two 
  pits 
  (acetabnla), 
  an 
  anterior 
  small 
  and 
  shallow, 
  a 
  posterior 
  larger 
  

   and 
  i)rofound, 
  with 
  a 
  strong 
  contractile 
  border; 
  anterior 
  acetabulum 
  

   continent 
  with 
  posterior 
  Fig. 
  8), 
  which 
  is 
  from 
  a 
  sketch 
  of 
  a 
  hardened 
  

   specimen 
  ; 
  the 
  thick 
  border 
  of 
  the 
  bothria 
  is 
  not 
  so 
  evident 
  m 
  fresh 
  

   specimens. 
  

  

  These 
  specimens 
  were 
  referred 
  at 
  the 
  time 
  of 
  collecting, 
  upon 
  a 
  some- 
  

   what 
  hasty 
  examination 
  of 
  the 
  living 
  worms, 
  to 
  0. 
  mi(justum, 
  but 
  on 
  

   account 
  of 
  the 
  smaller 
  size, 
  shorter 
  neck, 
  and 
  different 
  character 
  of 
  the 
  

   bothria 
  revealed 
  in 
  the 
  preserved 
  specimens, 
  I 
  have 
  found 
  it 
  necessary 
  

   to 
  make 
  a 
  difterent'disposition 
  of 
  them. 
  

  

  Dimensions 
  of 
  typical 
  example: 
  Length, 
  9 
  mm.; 
  diameter 
  of 
  head, 
  

   0.43; 
  length 
  of 
  bothrium, 
  0.22; 
  diameter 
  of 
  neck, 
  0.15; 
  distance 
  to 
  

   first 
  segments, 
  0.47; 
  breadth 
  of 
  first 
  segment, 
  0.15; 
  length 
  of 
  first 
  seg- 
  

   ment, 
  0.03; 
  length 
  of 
  fourth 
  segment 
  from 
  last, 
  0.47; 
  breadth 
  of 
  last 
  

   segments, 
  0.28; 
  length 
  of 
  last 
  segment, 
  1.03. 
  

  

  Under 
  a 
  high 
  magnifying 
  power 
  the 
  neck 
  and 
  segments 
  are 
  seen 
  to 
  

   be 
  crossed 
  by 
  fine 
  transverse 
  lines 
  which 
  give 
  a 
  finely 
  serrate 
  outline 
  

   to 
  the 
  margins, 
  the 
  neck 
  is 
  shorter 
  and 
  the 
  stria' 
  and 
  marginal 
  serra 
  

   tions 
  not 
  so 
  evident 
  as 
  in 
  0. 
  angustum. 
  

  

  The 
  disposition 
  of 
  the 
  reproductive 
  organs 
  agrees 
  with 
  that 
  of 
  0. 
  

   amjHsium. 
  The 
  vitelline 
  glands 
  lie 
  along 
  the 
  lateral 
  margins; 
  germ 
  

   gland 
  two-lobed 
  near 
  posterior 
  end; 
  vagina 
  curves 
  in 
  a 
  crook 
  arouna 
  

   and 
  in 
  front 
  of 
  cirrus-bulb; 
  cirrus 
  retracted 
  in 
  every 
  case, 
  but 
  was 
  seen 
  

   to 
  be 
  beset 
  with 
  minute 
  spines; 
  cirrus 
  bulb 
  pyriform; 
  reprodnctive 
  

   aperture 
  on 
  about 
  anterior 
  third 
  of 
  lateral 
  margin; 
  testes 
  longitudi 
  

   nally 
  placed, 
  central 
  to 
  vitelline 
  glands. 
  

  

  When 
  vScolices 
  of 
  preserved 
  specimens 
  of 
  O. 
  angustum 
  and 
  0. 
  paulum 
  

   are 
  compared 
  the 
  differences 
  are 
  seen 
  to 
  be 
  considerable, 
  and 
  can 
  not 
  

   be 
  accounted 
  for 
  by 
  different 
  action 
  of 
  the 
  preserving 
  fluid. 
  

  

  29. 
  ORYGMATOBOTHRIUM 
  CRENULATUM, 
  new 
  species. 
  

   (Plates 
  XXXIII, 
  figs. 
  9-12; 
  XXXIV, 
  fig. 
  1.) 
  

  

  Type. 
  — 
  No. 
  5506, 
  U.S.N, 
  M. 
  From 
  s])iial 
  intestine 
  of 
  the 
  stmg 
  ray 
  

   {DasyatU 
  eentrura); 
  Woods 
  Holl, 
  Massachusetts, 
  August 
  14, 
  1889; 
  two 
  

   examples. 
  

  

  Bothria 
  four, 
  cruciformly 
  disposed, 
  globular, 
  each 
  i)rovided 
  with 
  an 
  

   auxiliary 
  acetabulum 
  and 
  an 
  accessory 
  disk 
  of 
  strong 
  circular 
  fibers; 
  

   no 
  myzorhynchus; 
  neck 
  crossed 
  by 
  fine 
  transverse 
  hues, 
  which 
  make 
  a 
  

   serrate 
  or 
  creuulate 
  margin, 
  which 
  character 
  persists 
  throughout 
  the 
  

  

  