﻿430 
  riiOCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  8. 
  DIBOTHRIUM 
  PUNCTATUM 
  Rudolphi. 
  

  

  IHhotltriinn 
  punctatum 
  Runoi.Piii, 
  V. 
  8. 
  I'isli 
  Com. 
  Kept., 
  1887, 
  pp. 
  731-736, 
  pi. 
  il, 
  

   ligs. 
  1-4. 
  

  

  From 
  intestine 
  of 
  sand 
  flounder 
  {Botlms 
  maculaius 
  Mitchell), 
  Woods 
  

   Holl. 
  IMassaclin 
  setts, 
  July 
  23, 
  1889. 
  

  

  Three 
  specimens, 
  longest, 
  in 
  alcohol, 
  223 
  mm. 
  

  

  Nos. 
  4703, 
  4702, 
  4705, 
  4701, 
  4730, 
  4704, 
  4784. 
  There 
  are 
  nine 
  lots 
  of 
  

   specimens 
  belonging 
  to 
  this 
  species 
  in 
  the 
  Natioual 
  Museum 
  collection. 
  

  

  1. 
  Five 
  si)ecimens 
  from 
  stomach 
  of 
  sea 
  raven 
  {Eemitnjjteriis 
  ameri- 
  

   canus); 
  largest 
  about 
  3(i0 
  mm. 
  in 
  length. 
  

  

  2. 
  Three 
  specimens, 
  same 
  host, 
  Casco 
  Bay, 
  Maine, 
  Uuited 
  States 
  

   Fish 
  Commission 
  collection; 
  slender, 
  length, 
  400, 
  505, 
  and 
  630 
  mm., 
  

   respectively; 
  breadth, 
  1.75, 
  3, 
  and 
  3 
  mm., 
  respectively^ 
  

  

  3. 
  Same 
  host. 
  Woods 
  Holl, 
  Massachusetts, 
  Xovember 
  1), 
  1886; 
  V. 
  K 
  

   Edwards, 
  collector; 
  several 
  specimens 
  ; 
  length 
  of 
  typical 
  one, 
  290 
  mm., 
  

   and 
  breadth, 
  3. 
  

  

  4. 
  Same 
  host 
  and 
  locality; 
  October 
  12,1887; 
  largest 
  specimen, 
  280 
  

   mm. 
  in 
  length 
  and 
  2 
  in 
  breadth. 
  These 
  specimens 
  were 
  ])eculiar 
  in 
  

   having 
  a 
  pellucid 
  cordate 
  or 
  peltate 
  caudal 
  segment, 
  iireceded 
  by 
  three 
  

   or 
  four 
  narrowing 
  segments. 
  One 
  of 
  tliese 
  terminal 
  segments 
  was 
  2 
  

   mm. 
  in 
  length 
  and 
  1.5 
  in 
  breadth. 
  

  

  5. 
  Same 
  host 
  and 
  locality; 
  December 
  1, 
  1887 
  ; 
  twelve 
  specimens 
  in 
  lot. 
  

   The 
  dimensions 
  of 
  fonr 
  typical 
  specimens, 
  in 
  millimeters, 
  from 
  this 
  

   lot 
  follow 
  : 
  Length 
  740, 
  greatest 
  breadth 
  4 
  ; 
  length 
  280, 
  greatest 
  breadth 
  

   5; 
  length 
  530, 
  greatest 
  breadth 
  4.5; 
  length 
  480, 
  greatest 
  breadth 
  6. 
  

  

  6. 
  Same 
  host 
  and 
  locality; 
  one 
  specimen; 
  length, 
  575 
  ram.; 
  breadth, 
  4. 
  

  

  7. 
  Same 
  host 
  and 
  locality; 
  December 
  12, 
  1885; 
  ten 
  specimens; 
  heads 
  

   presenting 
  variety 
  of 
  shapes; 
  one 
  specimen 
  with 
  anterior 
  segments 
  for 
  

   first 
  30 
  or 
  40 
  mm. 
  filiform. 
  

  

  8. 
  Same 
  host 
  and 
  locality; 
  December 
  5, 
  1885; 
  largest 
  specimen 
  in 
  

   this 
  lot 
  measured 
  950 
  mm. 
  in 
  length 
  and 
  4.5 
  in 
  breadth; 
  length 
  of 
  one 
  

   head, 
  0.9; 
  breadth, 
  0.3; 
  length 
  of 
  another 
  head, 
  1.2; 
  breadth, 
  0.4. 
  

  

  Numbers 
  3 
  to 
  8 
  were 
  collected 
  by 
  Mr. 
  Y. 
  N. 
  Edwards. 
  

  

  9. 
  United 
  States 
  Fish 
  Commission, 
  otf 
  Block 
  Island, 
  1880, 
  from 
  intes- 
  

   tine 
  of 
  sand 
  dab 
  {Limandaferruginea), 
  three 
  specimens. 
  

  

  9. 
  DIBOTHRIUM 
  PLICATUM 
  Rudolphi. 
  

  

  Dihothrinm 
  plicatum 
  Rudolphi, 
  U. 
  S. 
  Fish 
  Com. 
  Rept., 
  1887, 
  pp. 
  746-750, 
  pi. 
  

   in, 
  figs. 
  1-6. 
  

  

  No. 
  4736, 
  U.S.N.M. 
  Label 
  reads: 
  "Trawl 
  line 
  near 
  station 
  2091, 
  

   United 
  States 
  Fish 
  Commission 
  steamer 
  Albatross, 
  1883. 
  Stomach 
  or 
  

   intestine 
  of 
  swordfish 
  {Xiphias 
  gladins).'' 
  

  

  The 
  specimen 
  is 
  a 
  fragment 
  90 
  mm. 
  long 
  and 
  8 
  in 
  greatest 
  breadth. 
  

  

  Since 
  the 
  usual 
  jiosition 
  of 
  this 
  species 
  is 
  in 
  the 
  rectum 
  of 
  its 
  host. 
  

  

  