﻿BURNE 
  : 
  ON 
  THE 
  ANATOMY 
  OF 
  RHYS 
  OTA 
  FOVLLIOYI. 
  211 
  

  

  An 
  important 
  divergence 
  from 
  the 
  condition 
  of 
  the 
  genitalia 
  

   characteristic 
  of 
  the 
  genus 
  Rhjsota 
  is, 
  however, 
  shown 
  in 
  the 
  

   presence 
  upon 
  the 
  vas 
  deferens 
  of 
  a 
  well-developed 
  kalk-sac. 
  In 
  

   this 
  important 
  particular 
  the 
  genitalia 
  resemble 
  those 
  of 
  Hemipleda 
  

   rather 
  than 
  of 
  Rhysota. 
  

  

  The 
  alimentary 
  tract 
  is 
  similar 
  to 
  that 
  described 
  in 
  the 
  genus 
  

   Rhysota, 
  particularly 
  in 
  the 
  needle-like 
  form 
  of 
  the 
  marginal 
  teeth 
  

   of 
  the 
  raclula, 
  in 
  the 
  nearly 
  straight 
  disposition 
  of 
  the 
  two 
  halves 
  of 
  

   each 
  transverse 
  row 
  of 
  teeth, 
  and 
  in 
  the 
  form 
  of 
  the 
  buccal 
  mass. 
  

   The 
  kidney 
  also 
  is 
  not 
  unlike 
  the 
  long 
  strap-shaped 
  kidney 
  described 
  

   for 
  this 
  genus. 
  

  

  For 
  the 
  above 
  reasons 
  it 
  appears 
  that 
  this 
  snail 
  should 
  be 
  included 
  

   in 
  the 
  genus 
  Rhysota 
  rather 
  than 
  in 
  Hemiplecta, 
  although 
  the 
  presence 
  

   of 
  a 
  kalk-sac 
  suggests 
  that 
  it 
  has 
  closer 
  affinities 
  with 
  Hemiplecta 
  than 
  

   the 
  hitherto 
  known 
  forms 
  of 
  Rhysota 
  from 
  the 
  Philippines. 
  

  

  In 
  conclusion, 
  I 
  wish 
  to 
  express 
  my 
  thanks 
  to 
  Colonel 
  Godwin- 
  

   Austen 
  for 
  help 
  with 
  the 
  literature 
  of 
  the 
  group, 
  and 
  for 
  allowing 
  me 
  

   to 
  submit 
  my 
  drawings 
  to 
  him 
  and 
  to 
  profit 
  by 
  his 
  experience 
  of 
  the 
  

   anatomy 
  of 
  Eastern 
  snails. 
  

  

  EXPLANATION 
  OF 
  PLATES 
  VII 
  AND 
  VIII. 
  

  

  Plate 
  VII. 
  

  

  Anatomy 
  of 
  Rhysota 
  Foiillioyi. 
  

  

  Fig. 
  1. 
  The 
  hinder 
  part 
  of 
  the 
  foot, 
  from 
  the 
  left. 
  M.B.^, 
  M.B.-, 
  lower 
  and 
  upper 
  

  

  borders, 
  M.P. 
  mucous 
  pore. 
  

  

  ,, 
  2. 
  The 
  mantle 
  border. 
  L.C.L.', 
  L.C.L.^ 
  left 
  cervical 
  lobe, 
  E.C.L. 
  right 
  

  

  cervical 
  lobe. 
  Eod, 
  in 
  respiratory 
  orifice. 
  

   ,, 
  3. 
  The 
  retractor 
  muscles, 
  from 
  above. 
  B.R. 
  buccal 
  retractor, 
  P.E. 
  pedal 
  

  

  retractor, 
  T.'E., 
  T.-E. 
  retractors 
  for 
  the 
  two 
  tentacles. 
  

   ,, 
  4. 
  General 
  view 
  of 
  viscera 
  from 
  above. 
  A. 
  A. 
  anterior 
  aorta, 
  AL.G. 
  albumen 
  

   , 
  gland, 
  B.D. 
  bile-duct, 
  CL. 
  genital 
  cloaca, 
  HM.D. 
  hermaphrodite 
  duct, 
  

   INT. 
  intestine, 
  K. 
  kidney, 
  K.S. 
  kalk-sac, 
  M. 
  mesentery 
  of 
  vas 
  deferens 
  

   P. 
  penis, 
  PC. 
  pericardium, 
  E. 
  rectum, 
  E.P. 
  retractor 
  penis, 
  E.S. 
  

   receptaculum 
  seminis, 
  S.G. 
  salivary 
  glands, 
  ST. 
  stomach, 
  T.^, 
  T.- 
  

   tentacles, 
  U. 
  ureter, 
  V. 
  vagina, 
  V.D. 
  vas 
  deferens 
  ; 
  dotted 
  area, 
  liver. 
  

   ,, 
  4«. 
  Diagram 
  of 
  arrangement 
  of 
  gut 
  coils. 
  

  

  Plate 
  VIII. 
  

  

  Fig. 
  5. 
  The 
  genital 
  organs 
  spread 
  out. 
  The 
  cloaca, 
  vagina, 
  and 
  penis-sheath 
  are 
  

   opened. 
  EP. 
  epiphallus, 
  0. 
  oviduct, 
  0.- 
  its 
  opening 
  into 
  vagina, 
  

   P.Gl. 
  glandular 
  bodies 
  on 
  penis, 
  P.S. 
  sheath 
  of 
  penis 
  ; 
  other 
  letters 
  as 
  

   in 
  Fig. 
  4. 
  

  

  ,, 
  5«. 
  The 
  penis, 
  opened. 
  S.F. 
  papillate 
  seminal 
  folds 
  ; 
  other 
  letters 
  as 
  in 
  Fig. 
  5. 
  

  

  ,, 
  G. 
  Inner 
  surface 
  of 
  mantle. 
  K. 
  kidney 
  (dotted), 
  U. 
  ureter. 
  

  

  ,, 
  7. 
  Anterior 
  view 
  of 
  head. 
  L. 
  beaded 
  circular 
  lip, 
  L.^ 
  lateral 
  lip, 
  M.B.', 
  

   M.B.^ 
  the 
  two 
  marginal 
  bands 
  of 
  the 
  foot. 
  

  

  ,, 
  8. 
  The 
  radula. 
  A. 
  central 
  and 
  admedian, 
  B. 
  lateral, 
  C. 
  marginal 
  teeth. 
  

  

  