﻿450 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  xx. 
  

  

  39. 
  RHYNCHOBOTHRIUM 
  IMPARISPINE 
  Linton. 
  

  

  lihynchohothrium 
  imparinpiue 
  Linton, 
  U. 
  S. 
  Fish 
  Com. 
  Ke]»t., 
  1887, 
  pp. 
  840-843, 
  

   pi. 
  XII, 
  ligs. 
  6-9.' 
  

  

  No. 
  4745, 
  U 
  S.N.M. 
  From 
  tlie 
  intestine 
  of 
  the 
  skate; 
  October 
  17, 
  

   1887, 
  Woods 
  HoU, 
  Massacluisetts 
  ; 
  V. 
  iS^. 
  Edwards, 
  collector, 
  seven 
  

   specimens. 
  

  

  Dimensions 
  of 
  alcoholic 
  specimen: 
  Length, 
  2G 
  mm.; 
  length 
  of 
  both- 
  

   rium, 
  0.0; 
  length 
  of 
  head 
  and 
  neck, 
  0; 
  length 
  of 
  posterior 
  segments, 
  2.2; 
  

   breadth 
  of 
  posterior 
  segments, 
  1. 
  

  

  The 
  hooks 
  of 
  this 
  species 
  bear 
  a 
  close 
  resemblance 
  to 
  those 
  of 
  B. 
  

   erinaceus 
  IJeneden. 
  

  

  The 
  species 
  of 
  skate 
  is 
  probably 
  Raja 
  erinacea., 
  

  

  40. 
  RHYNCHOBOTHRIUM 
  LONGICORNE 
  Linton. 
  

  

  Bhynchobothrimn 
  longhicorne 
  Linton, 
  U. 
  S. 
  Fish 
  Com. 
  Kept., 
  1887, 
  pp. 
  847-849, 
  ]il. 
  

   XIII, 
  figs. 
  4-8. 
  

  

  Ko. 
  4839, 
  U.S.N.M. 
  was 
  collected 
  at 
  Woods 
  Holl, 
  Massachusetts, 
  date 
  

   not 
  given; 
  from 
  intestine 
  of 
  sand 
  shark 
  {Carcharias 
  JittoraUs). 
  

  

  Dimensions 
  of 
  alcoholic 
  specimen: 
  Length, 
  35 
  mm.; 
  length 
  of 
  head 
  

   and 
  neck, 
  5; 
  length 
  of 
  proboscis, 
  approximately, 
  4; 
  length 
  of 
  last 
  seg- 
  

   ment, 
  3.5; 
  breadth 
  of 
  last 
  segment, 
  1.75. 
  

  

  Genital 
  aperture 
  near 
  anterior 
  end 
  with 
  prominent 
  lips 
  showing 
  crenu- 
  

   late 
  outline. 
  The 
  bothria 
  project 
  in 
  front 
  of 
  the 
  head, 
  are 
  distinctly 
  

   emarginate 
  posteriorly, 
  and 
  bilobulate, 
  with 
  a 
  prominent 
  median 
  ridge 
  

   between 
  the 
  loculi. 
  Hooks 
  of 
  very 
  diverse 
  shaj)es. 
  

  

  41. 
  RHYNCHOBOTHRIUM 
  BREVISPINE, 
  new 
  species. 
  

  

  (Plate 
  XXXIV, 
  figs. 
  9-11.) 
  

  

  Type. 
  — 
  No. 
  4750, 
  U.S.N.M, 
  Label 
  reads: 
  "Intestine 
  of 
  small 
  ray; 
  

   Penikese, 
  July 
  13, 
  1874." 
  

  

  It 
  is 
  highly 
  probable 
  that 
  the 
  ray 
  was 
  Rhinoptera 
  honasus, 
  since 
  

   a 
  parasite 
  recognized 
  as 
  Rhinehotkrium 
  longicolle 
  was 
  along 
  with 
  this 
  

   parasite 
  in 
  the 
  same 
  vial. 
  

  

  Bothria 
  elliptical, 
  divergent 
  at 
  base; 
  neck 
  subcylindrical 
  ; 
  first 
  seg- 
  

   ments 
  very 
  short 
  and 
  crowded, 
  becoming 
  squarish, 
  then 
  much 
  longer 
  

   than 
  broad, 
  last 
  segments 
  four 
  or 
  more 
  times 
  as 
  long 
  as 
  broad; 
  repro- 
  

   ductive 
  aperture 
  near 
  middle 
  of 
  lateral 
  margin, 
  or 
  a 
  trifle 
  nearer 
  the 
  

   posterior 
  than 
  the 
  anterior 
  edge 
  of 
  the 
  segments; 
  proboscides 
  long 
  

   and 
  slender, 
  twice 
  as 
  long 
  as 
  the 
  bothria, 
  very 
  slightly 
  tumid 
  at 
  base, 
  

   tapering 
  a 
  little 
  toward 
  the 
  apex; 
  hooks 
  small, 
  about 
  four 
  longitudinal 
  

   TOWS 
  of 
  stout 
  hooks 
  with 
  broad 
  bases 
  and 
  recurved 
  points, 
  these 
  flanked 
  

   by 
  two 
  longitudinal 
  rows 
  on 
  each 
  side 
  of 
  smaller 
  hooks 
  not 
  quite 
  so 
  

  

  'Errata, 
  p. 
  839, 
  line 
  2, 
  read 
  figs. 
  3-5 
  inHtead 
  of 
  figs. 
  3-6; 
  p. 
  840, 
  line 
  13, 
  read 
  figs. 
  

   6-9 
  instead 
  of 
  figs. 
  7-9; 
  p. 
  880, 
  for 
  Anihobothrium, 
  read 
  Anthocephalum; 
  p. 
  890, 
  fig. 
  

   6, 
  with 
  explanation, 
  should 
  follow 
  Rhyiichohotln'iinn 
  iiiparispine. 
  

  

  