﻿568 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  io» 
  

  

  cated 
  in 
  figure 
  66,6. 
  In 
  the 
  case 
  of 
  white 
  planarians 
  with 
  truncate 
  

   anterior 
  margin, 
  it 
  is 
  necessary 
  to 
  examine 
  transverse 
  sections 
  of 
  the 
  

   pharynx 
  to 
  determine 
  the 
  family. 
  Such 
  sections 
  were 
  prepared 
  but 
  

   because 
  of 
  their 
  bad 
  histological 
  condition 
  I 
  was 
  left 
  in 
  some 
  uncer- 
  

   tainty 
  on 
  this 
  point. 
  As 
  far 
  as 
  I 
  can 
  make 
  out, 
  however, 
  the 
  arrange- 
  

   ment 
  of 
  the 
  inner 
  pharynx 
  musculature 
  corresponds 
  to 
  the 
  family 
  

   Kenkiidae 
  but 
  the 
  possibility 
  remains 
  that 
  the 
  animal 
  might 
  belong 
  

   to 
  the 
  Dendrocoelidae, 
  which 
  it 
  much 
  resembles 
  externally. 
  The 
  

   body 
  margins 
  are 
  provided 
  with 
  enlarged 
  rhabdites 
  as 
  characteristic 
  

   of 
  cave 
  planarians. 
  

  

  Adhesive 
  organ. 
  — 
  An 
  adhesive 
  organ 
  is 
  found 
  in 
  the 
  center 
  of 
  the 
  

   anterior 
  margin 
  in 
  all 
  members 
  of 
  the 
  family 
  Kenkiidae 
  and 
  also 
  

   frequently 
  in 
  members 
  of 
  the 
  Dendrocoelidae. 
  Sagittal 
  sections 
  of 
  

   the 
  anterior 
  end 
  of 
  Sphalloplana 
  georgiana 
  showed 
  a 
  rather 
  simply 
  

   constructed 
  adhesive 
  organ 
  as 
  characteristic 
  of 
  the 
  genus. 
  This 
  

   region 
  of 
  the 
  specimens 
  proved 
  to 
  be 
  in 
  better 
  histological 
  condition 
  

   than 
  the 
  rest 
  of 
  the 
  body. 
  A 
  sagittal 
  view 
  of 
  the 
  adhesive 
  organ 
  is 
  

   given 
  in 
  figure 
  65,d. 
  There 
  is 
  a 
  small 
  cuplike 
  depression 
  at 
  the 
  

   margins 
  of 
  which 
  the 
  regular 
  covering 
  epidermis 
  ceases 
  rather 
  abruptly, 
  

   being 
  replaced 
  by 
  a 
  noncellular 
  margin 
  dotted 
  with 
  eosinophilous 
  

   secretion. 
  From 
  the 
  inner 
  sm-face 
  of 
  the 
  cup 
  longitudinal 
  retractor 
  

   muscles 
  proceed 
  posteriorly 
  and 
  curve 
  ventrally 
  to 
  join 
  the 
  regular 
  

   ventral 
  subepidermal 
  musculature. 
  The 
  eosinophilous 
  glands, 
  which 
  

   presumably 
  provide 
  the 
  eosinophilous 
  secretion, 
  could 
  not 
  be 
  found 
  

   in 
  the 
  available 
  material. 
  

  

  Reproductive 
  system. 
  — 
  The 
  testes 
  could 
  not 
  be 
  seen 
  in 
  any 
  of 
  the 
  

   animals 
  when 
  whole 
  but 
  were 
  discovered 
  in 
  sections 
  in 
  a 
  poor 
  condi- 
  

   tion 
  in 
  two 
  rather 
  short, 
  lateral 
  bands 
  immediately 
  anterior 
  to 
  the 
  

   pharynx 
  and 
  have 
  been 
  inserted 
  in 
  figm-e 
  66,6. 
  As 
  far 
  as 
  could 
  be 
  

   ascertained, 
  they 
  do 
  not 
  extend 
  anteriorly 
  as 
  far 
  as 
  is 
  usually 
  the 
  

   case 
  in 
  planarians. 
  The 
  testes 
  are 
  small 
  and 
  situated 
  ventrally. 
  The 
  

   ovaries 
  were 
  not 
  discernible 
  in 
  the 
  sections. 
  The 
  copulatory 
  appa- 
  

   ratus 
  is 
  situated 
  well 
  behind 
  the 
  pharynx 
  as 
  shown 
  in 
  figure 
  66,6. 
  

   It 
  was 
  in 
  bad 
  condition 
  in 
  both 
  of 
  two 
  sets 
  of 
  sagittal 
  sections 
  pre- 
  

   pared, 
  but 
  a 
  sagittal 
  view, 
  given 
  in 
  figure 
  67,a, 
  has 
  been 
  pieced 
  to- 
  

   gether 
  by 
  study 
  of 
  these 
  sections. 
  There 
  is 
  a 
  well-developed, 
  rounded, 
  

   and 
  highly 
  muscular 
  penis 
  bulb 
  that 
  was 
  conspicuous 
  in 
  the 
  whole 
  

   animals 
  (fig. 
  66, 
  6) 
  but 
  less 
  evident 
  in 
  sections. 
  The 
  sperm 
  ducts, 
  

   ascending 
  from 
  below, 
  pass 
  separately 
  through 
  the 
  penis 
  bulb 
  and 
  

   open 
  into 
  the 
  sides 
  of 
  the 
  rounded 
  bulbar 
  cavity, 
  occupying 
  the 
  cen- 
  

   ter 
  of 
  the 
  bulb 
  (fig. 
  67, 
  a). 
  The 
  bulbar 
  cavity 
  continues 
  as 
  a 
  rather 
  

   wide 
  ejaculatory 
  duct 
  through 
  the 
  conical 
  penis 
  papilla 
  to 
  the 
  tip 
  of 
  

   the 
  latter. 
  The 
  penis 
  papilla 
  is 
  somewhat 
  muscular 
  and 
  clothed 
  with 
  

   a 
  tall 
  epithelium. 
  It 
  lies 
  in 
  a 
  spacious 
  male 
  antrum, 
  into 
  the 
  dorsal 
  

   wall 
  of 
  which 
  there 
  opens 
  the 
  common 
  ovovitelline 
  duct 
  sun-ounded 
  

  

  