﻿298 
  W. 
  BLAXLAND 
  BENHAM. 
  

  

  position 
  of 
  y. 
  in 
  fig. 
  25. 
  On 
  this 
  side 
  of 
  tiie 
  section 
  the 
  lining 
  of 
  the 
  penial 
  

  

  sac 
  is 
  involved 
  (/?. 
  «.) 
  ; 
  on 
  the 
  left 
  side 
  the 
  cavity 
  of 
  the 
  atrial 
  sac 
  is 
  still 
  seen 
  

  

  [N.B. 
  — 
  The 
  cytoplasmic 
  details 
  are 
  not 
  indicated 
  in 
  figs. 
  25, 
  26, 
  28.] 
  

  

  Fig. 
  27. 
  — 
  The 
  third 
  section 
  belovr 
  the 
  last 
  is 
  a 
  transverse 
  section 
  of 
  the 
  

  

  penial 
  sac. 
  The 
  epithelium 
  is 
  totally 
  different 
  from 
  that 
  of 
  the 
  atrium 
  ; 
  its 
  

  

  cytoplasm 
  is 
  striated, 
  and 
  small 
  vesicles 
  are 
  seen 
  in 
  it, 
  especially 
  near 
  its 
  base. 
  

  

  Pig. 
  28. 
  — 
  A 
  longitudinal 
  section 
  through 
  the 
  penial 
  sac 
  involving 
  the 
  male 
  

  

  pore 
  (cf. 
  fig. 
  17). 
  The 
  fold 
  (^.) 
  in 
  the 
  epithelium 
  is 
  evidently 
  connected 
  with 
  

  

  the 
  non-j)rotrusion 
  of 
  the 
  penial 
  papilla. 
  

  

  