﻿438 
  rEocEEDixas 
  of 
  the 
  national 
  museum. 
  

  

  sphincter 
  was 
  made 
  out 
  on 
  the 
  oviduct 
  near 
  the 
  ovary 
  (Fig. 
  C). 
  The 
  

   uterus 
  o])ens 
  externally 
  on 
  the 
  middle 
  of 
  the 
  dorsal 
  surface. 
  

  

  The 
  structure 
  of 
  the 
  body 
  is 
  in 
  brief 
  as 
  follows 
  : 
  Named 
  from 
  the 
  

   outside 
  the 
  layers 
  are 
  : 
  1, 
  cuticle 
  ; 
  H, 
  a 
  granular 
  layer 
  which 
  contains 
  radi- 
  

   ating 
  horizontal 
  and 
  longitudinal 
  libers 
  and 
  carries 
  m 
  its 
  meshes 
  numer- 
  

   ous 
  small 
  nucleated 
  cells. 
  The 
  longitudinal 
  libers 
  of 
  this 
  layer 
  lie 
  mainly 
  

   near 
  the 
  cuticle; 
  3, 
  a 
  glandular 
  layer 
  containing 
  the 
  vitillaria 
  witli 
  

   radiating 
  connective 
  fibers; 
  4, 
  a 
  thin 
  layer 
  of 
  circular 
  fibers; 
  o, 
  a 
  tliick 
  

   layer 
  of 
  coarse 
  longitudinal 
  fibers, 
  gathered 
  into 
  bundles, 
  with 
  trans- 
  

   verse 
  connective 
  fibers 
  between 
  the 
  muscle 
  bundles; 
  0, 
  a 
  layer 
  of 
  circu- 
  

   lar 
  fibers 
  which 
  surrounds 
  7, 
  the 
  inner 
  core 
  of 
  the 
  body 
  containing 
  the 
  

   testes, 
  which 
  consists 
  of 
  lobular 
  glands 
  in 
  a 
  granular 
  and 
  tibrous 
  stroma. 
  

  

  Calcareous 
  bodies 
  are 
  present 
  in 
  the 
  central 
  core 
  and 
  sparsely 
  scat- 
  

   tered 
  elsewhere, 
  but 
  nowhere 
  abundant 
  in 
  the 
  sections 
  that 
  were 
  exam- 
  

   ined. 
  

  

  17. 
  DIBOTHRIUM 
  LIGULA 
  Donnadieu. 
  

  

  Lh/ula 
  digramma 
  C'repmn 
  (larva) 
  Diesing, 
  Syst. 
  Helm., 
  I, 
  pp. 
  580-581; 
  Revis. 
  

  

  (1. 
  Cephal. 
  Parani., 
  pp. 
  231-232. 
  — 
  Schauinslaxu, 
  Eiubryonaleutwickl. 
  pp. 
  

  

  31-36, 
  pi. 
  Ill, 
  fig.s. 
  1-7. 
  

   Dibothriiim 
  lifjula 
  ZsnioKKE, 
  Rech., 
  pp. 
  26-27. 
  

   LUjula 
  cafostomi 
  Linton, 
  Bulletin 
  IT. 
  S. 
  Fish 
  Com., 
  IX, 
  pp. 
  66-72, 
  i>l. 
  xxiii, 
  ligs. 
  

  

  1-5; 
  pi. 
  XXIV, 
  figs. 
  1-6; 
  pi. 
  xxv, 
  fig. 
  1. 
  

  

  1. 
  No. 
  470G, 
  U.S.N.M. 
  Label 
  reads: 
  "Taken 
  from 
  the 
  sucker 
  (Catos- 
  

   tomiis 
  latipinnis 
  or 
  C. 
  insignis) 
  inhabiting 
  the 
  Gila 
  Ifiver 
  and 
  Salt 
  River, 
  

   Arizona. 
  Several 
  are 
  found 
  in 
  one 
  fish. 
  E. 
  Palmer, 
  one 
  sj^ecimen." 
  

  

  Dimensions: 
  Length, 
  1*8!) 
  mm.; 
  greatest 
  breadth, 
  11. 
  a; 
  breadth, 
  

   10 
  mm. 
  from 
  anterior 
  end, 
  0; 
  breadth, 
  10 
  mm, 
  from 
  posterior 
  end, 
  11. 
  

  

  Body 
  smooth, 
  with 
  median 
  furrow 
  along 
  middle 
  of 
  each 
  side. 
  With 
  

   lens, 
  body 
  seen 
  to 
  be 
  divided 
  into 
  segments 
  by 
  fine 
  transverse 
  lines 
  

   which 
  are 
  about 
  0.4 
  mm. 
  apart 
  in 
  the 
  middle 
  region 
  of 
  the 
  body; 
  also 
  

   minute 
  pores 
  can 
  be 
  distinguished 
  in 
  median 
  furrow 
  toward 
  i)Osterior 
  

   end 
  of 
  body, 
  

  

  2. 
  No. 
  4708, 
  U.S.N.M. 
  Label 
  reads: 
  "From 
  intestine 
  of 
  river 
  smelt 
  

   {Osmerus 
  mordax) 
  Potomac 
  Kiver 
  ; 
  C. 
  E. 
  Rideuour, 
  Hagerstown, 
  

   Maryland." 
  

  

  One 
  specimen, 
  length, 
  230 
  mm. 
  ; 
  breadth 
  near 
  anterior 
  end, 
  G.5; 
  great- 
  

   est 
  breadth 
  back 
  of 
  head, 
  8.5; 
  breadth 
  near 
  i)osterior 
  end, 
  3. 
  

  

  3. 
  No. 
  4707, 
  U.S.N.M. 
  From 
  silvery 
  minnow 
  {Hyhognatlius 
  nuchale). 
  

   One 
  specimen, 
  length, 
  270 
  mm.; 
  greatest 
  breadth, 
  12; 
  thickness, 
  3.5. 
  

   Minute 
  transverse 
  striic 
  cross 
  the 
  body 
  and 
  there 
  is 
  a 
  deep 
  median 
  

  

  furrow 
  on 
  one 
  side. 
  

  

  4. 
  No. 
  4725, 
  U.S.N.M. 
  Label 
  reads: 
  "From 
  male 
  red-fin 
  {Xotro2)is 
  

   cormiius 
  Rafinesque); 
  Fourth 
  Lake, 
  Fulton 
  Chain, 
  Adirondacks; 
  fish 
  

   4 
  inches 
  long, 
  but 
  milt 
  not 
  developed; 
  F. 
  Mather, 
  duly 
  2, 
  1882." 
  

  

  Several 
  fragments 
  in 
  bad 
  state 
  of 
  preservation. 
  Largest 
  fragment: 
  

   Length, 
  .45 
  mm.; 
  greatest 
  breadth, 
  5; 
  thickness, 
  2.5. 
  Median 
  furrow 
  

   distinct. 
  

  

  