﻿564 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  Eyes. 
  — 
  Typically 
  two, 
  but 
  two 
  of 
  the 
  five 
  specimens 
  show 
  super- 
  

   numerary 
  eyes 
  as 
  in 
  figure 
  65, 
  a, 
  6; 
  possibly 
  this 
  indicates 
  a 
  breakdown 
  

   of 
  the 
  eyes 
  in 
  relation 
  to 
  the 
  cave 
  habitat. 
  

  

  General 
  structure. 
  — 
  The 
  histological 
  condition 
  of 
  the 
  specimens 
  is 
  

   poor 
  and 
  it 
  is 
  impossible 
  to 
  furnish 
  details 
  of 
  the 
  structure. 
  The 
  

   pharynx 
  appears 
  somewhat 
  long 
  for 
  the 
  size 
  of 
  the 
  animal 
  (fig. 
  65, 
  a) 
  . 
  

   In 
  the 
  median 
  line 
  of 
  the 
  head 
  anterior 
  to 
  the 
  eyes 
  a 
  light 
  streak 
  was 
  

   noticeable 
  on 
  the 
  whole 
  animals 
  (fig. 
  65, 
  a) 
  but 
  one 
  of 
  the 
  heads 
  was 
  

   sectioned 
  sagittally 
  and, 
  although 
  its 
  histological 
  condition 
  is 
  bad, 
  it 
  

   appears 
  certain 
  that 
  the 
  midregion 
  does 
  not 
  differ 
  histologically 
  from 
  

   the 
  rest 
  of 
  the 
  head. 
  The 
  body 
  margins 
  do 
  not 
  present 
  any 
  enlarged 
  

   rhabdites. 
  

  

  Reproductive 
  system. 
  — 
  Testes 
  evident 
  in 
  the 
  worms 
  when 
  whole 
  and 
  

   extend 
  in 
  lateral 
  regions 
  from 
  the 
  level 
  of 
  about 
  the 
  fourth 
  intestinal 
  

   diverticulum 
  to 
  the 
  level 
  of 
  the 
  gonopore 
  (fig. 
  65, 
  a). 
  Transverse 
  

   and 
  sagittal 
  sections 
  show 
  that 
  the 
  testes 
  are 
  situated 
  ventrally. 
  

   A 
  sagittal 
  view 
  of 
  the 
  copulatory 
  apparatus, 
  constructed 
  from 
  two 
  

   sets 
  of 
  sagittal 
  sections, 
  is 
  shown 
  in 
  figure 
  65, 
  c. 
  The 
  sperm 
  ducts, 
  

   ascending 
  from 
  below 
  into 
  the 
  slightly 
  developed 
  penis 
  bulb, 
  enter 
  

   separately 
  the 
  bulbar 
  cavity. 
  This 
  is 
  an 
  oval 
  cavity 
  that 
  makes 
  a 
  

   right-angled 
  bend 
  and 
  continues 
  through 
  the 
  penis 
  papilla 
  as 
  the 
  

   ejaculatory 
  duct. 
  The 
  penis 
  papilla 
  has 
  a 
  short 
  truncate 
  form, 
  and 
  is 
  

   noticeably 
  lacking 
  in 
  muscularity. 
  It 
  is 
  also 
  asymmetrical, 
  very 
  

   decidedly 
  so 
  in 
  one 
  of 
  the 
  sagittal 
  series; 
  its 
  dorsal 
  wall 
  is 
  longer 
  than 
  

   the 
  ventral 
  wall. 
  The 
  penis 
  papilla 
  lies 
  in 
  a 
  well-developed 
  male 
  

   antrum 
  that 
  narrows 
  towards 
  the 
  common 
  gonopore. 
  Juxst 
  before 
  

   joining 
  the 
  vagina, 
  the 
  male 
  antrum 
  receives 
  the 
  common 
  ovovitelline 
  

   duct 
  into 
  its 
  dorsal 
  wall. 
  The 
  female 
  canal 
  shows 
  an 
  unusual 
  degree 
  

   of 
  separation 
  from 
  the 
  male 
  antrum. 
  There 
  is, 
  in 
  fact, 
  no 
  develop- 
  

   ment 
  of 
  a 
  female 
  antrum 
  or 
  common 
  antrum 
  as 
  the 
  vagina 
  joins 
  the 
  

   male 
  antrum 
  almost 
  at 
  the 
  gonopore. 
  The 
  vagina 
  or 
  terminal 
  part 
  of 
  

   the 
  female 
  canal 
  is 
  somewhat 
  expanded 
  and 
  lined 
  by 
  a 
  very 
  tall 
  

   epithelium. 
  The 
  vagina 
  is 
  continuous 
  with 
  the 
  bursal 
  canal 
  of 
  which 
  

   it 
  is 
  really 
  the 
  terminal 
  portion. 
  The 
  bursal 
  canal 
  as 
  usual 
  is 
  a 
  narrow 
  

  

  Explanation 
  of 
  figures 
  

  

  1, 
  eyes 
  15, 
  cavity 
  of 
  adhesive 
  organ 
  

  

  2, 
  intestinal 
  diverticula 
  16, 
  eosinophilous 
  lining 
  of 
  adhesive 
  organ 
  

  

  3, 
  testes 
  17, 
  retractor 
  muscle 
  of 
  adhesive 
  organ 
  

  

  4, 
  pharynx 
  18, 
  adhesive 
  organ 
  

  

  5, 
  sperm 
  ducts 
  19, 
  ovaries 
  

  

  6, 
  penis 
  bulb 
  20, 
  margin 
  of 
  large 
  rhabdites 
  

  

  7, 
  penis 
  papilla 
  21, 
  adhesive 
  tail 
  region 
  

  

  8, 
  ejaculatory 
  duct 
  22, 
  eosinophilous 
  gland 
  cells 
  

  

  9, 
  male 
  antrum 
  23, 
  protractor 
  muscle 
  

  

  10, 
  vagina 
  24, 
  gland 
  areas 
  of 
  male 
  apparatus 
  

  

  11, 
  copulatory 
  bursa 
  25, 
  female 
  antrum 
  

  

  12, 
  bursal 
  canal 
  26, 
  common 
  antrum 
  

  

  13, 
  entrance 
  of 
  ovovitelline 
  duct 
  27, 
  common 
  gonopore 
  

  

  14, 
  bulbar 
  cavity 
  

  

  