﻿132 
  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  and 
  are 
  then 
  drawn 
  out 
  into 
  hairs; 
  and 
  it 
  seems 
  possible 
  tliat 
  the 
  

   hairs 
  found 
  in 
  the 
  sub-genus 
  Trichia 
  may 
  have 
  been 
  evolved 
  from 
  

   granular 
  sculpture 
  in 
  a 
  somewhat 
  similar 
  manner. 
  Lastly, 
  "we 
  find 
  

   in 
  tliis 
  sub-genus 
  a 
  tendency 
  to 
  get 
  rid 
  of 
  these 
  hairs, 
  full-grown 
  

   shells 
  of 
  H, 
  striolata 
  (Pfeiff.) 
  and 
  If. 
  ccelata 
  (Stud.) 
  being 
  quite 
  

   smooth, 
  excepting 
  for 
  the 
  extremely 
  tine 
  strioe 
  and 
  the 
  ordinary 
  lines 
  

   of 
  growth. 
  

  

  EXPLANATION 
  OF 
  PLATES. 
  

   Plate 
  IL 
  

  

  Hygromia 
  liiubata 
  (Drap.); 
  Coombe 
  in 
  Teignbeaxl, 
  S. 
  Devon. 
  

   Fig. 
  

  

  1. 
  Central 
  nervous 
  system, 
  x 
  12. 
  

  

  2. 
  Living 
  animal, 
  x 
  2. 
  

  

  3. 
  Side 
  view 
  of 
  retractor 
  muscles 
  and 
  buccal 
  mass, 
  x 
  4h. 
  

  

  4. 
  Mantle-edge, 
  with 
  pallial 
  lobes 
  and 
  part 
  of 
  foot. 
  x 
  5|. 
  

  

  5. 
  Roof 
  of 
  mantle-cavity 
  viewed 
  from 
  below, 
  with 
  heart, 
  kidney, 
  etc. 
  X 
  4. 
  

  

  6. 
  Trematode 
  from 
  cavity 
  of 
  kidney, 
  viewed 
  from 
  below, 
  x 
  30. 
  

  

  7. 
  Reproductive 
  organs, 
  x 
  5. 
  

  

  8. 
  Anterior 
  ends 
  of 
  spermatozoa, 
  that 
  on 
  the 
  left 
  being 
  immature, 
  x 
  700. 
  

  

  9. 
  Dart. 
  x 
  3. 
  

  

  10. 
  Digestive 
  organs, 
  x 
  4. 
  

  

  11. 
  Transverse 
  sections 
  through 
  vagina, 
  dart-sac, 
  and 
  accessory 
  sac, 
  at 
  the 
  

  

  levels 
  shown 
  by 
  the 
  letters 
  A, 
  B, 
  C, 
  and 
  D 
  in 
  fig. 
  7. 
  

  

  Plate 
  IIL 
  

  

  12. 
  Shell 
  of 
  Hygromia 
  limhata 
  (Drap.), 
  S. 
  Devon. 
  x 
  2. 
  

  

  13. 
  The 
  same 
  shell 
  viewed 
  from 
  below. 
  x 
  2. 
  

  

  14. 
  Shell 
  of 
  H. 
  incarnata 
  (MiilL), 
  Bex, 
  Switzerland. 
  x 
  2. 
  

  

  15. 
  Shell 
  of 
  //. 
  cincteUa 
  (Drap.), 
  Ciboure, 
  Basses-Pyrenees; 
  a 
  conical 
  specimen. 
  

  

  X 
  2. 
  

  

  16. 
  Shell 
  of 
  H. 
  cinctcUa 
  (Drap.), 
  Ciboure, 
  Basses-Pyrenees; 
  a 
  depressed 
  

  

  specimen, 
  x 
  2. 
  

  

  17. 
  Shell 
  of 
  young 
  H. 
  limhata 
  (Drap.), 
  Ciboure, 
  Basses-Pyrenees, 
  x 
  2. 
  

  

  18. 
  Shell 
  of 
  H, 
  limhata 
  var. 
  troclioides, 
  Moq., 
  Salies-de-Bearn, 
  Basses- 
  

  

  Pyrenees. 
  X 
  2. 
  

  

  19. 
  Shell 
  of 
  H. 
  limbata 
  (Drap.), 
  Salies-de-Bearn, 
  Basses-Pyrenees 
  ; 
  a 
  depressed 
  

  

  specimen. 
  x 
  2. 
  

  

  20. 
  Posterior 
  end 
  and 
  a 
  piece 
  from 
  near 
  the 
  anterior 
  end 
  of 
  the 
  spermatophore 
  

  

  of 
  H. 
  limbata 
  (Drap.), 
  Argeles, 
  Hautes-Pyrenees. 
  x 
  14. 
  

  

  21. 
  Reproductive 
  organs 
  of 
  H. 
  cincteUa 
  (Drap.), 
  Ciboure, 
  Basses-Pyrenees. 
  X 
  4. 
  

  

  22. 
  Microscopical 
  sculpture 
  of 
  shell 
  of 
  H. 
  limhata 
  (Drap.), 
  S. 
  Devon. 
  x 
  40. 
  

  

  23. 
  Microscopical 
  sculpture 
  of 
  shell 
  of 
  H. 
  cincteUa 
  (Drap.), 
  Ciboure, 
  Basses- 
  

  

  Pyrenees. 
  X 
  40. 
  

  

  24. 
  Microscopical 
  sculpture 
  of 
  shell 
  of 
  H. 
  fusca 
  (Mont.), 
  Corbridge, 
  South 
  

  

  Northumberland. 
  x 
  40. 
  

  

  25. 
  Microscopical 
  sculpture 
  of 
  shell 
  of 
  H. 
  glabella 
  (Drap.), 
  Basses-Alpes. 
  x 
  40. 
  

  

  26. 
  Microscopical 
  sculpture 
  of 
  shell 
  of 
  H. 
  incarnata 
  (MiilL), 
  Bex, 
  Switzerland. 
  

  

  X 
  40. 
  

  

  27. 
  Jaw 
  of 
  H. 
  limbata 
  (Drap.), 
  S. 
  Devon. 
  x 
  14. 
  

  

  28. 
  Jaw 
  of 
  H. 
  cincteUa 
  (Drap.), 
  Ciboure, 
  Basses-Pyrenees, 
  x 
  13J. 
  

  

  29. 
  Representative 
  teeth 
  from 
  the 
  radula 
  of 
  H. 
  limbata 
  (Drap.), 
  S. 
  Devon. 
  

  

  X 
  300. 
  

  

  30. 
  Representative 
  teeth 
  from 
  the 
  radula 
  of 
  H. 
  cincteUa 
  (Drap.), 
  Ciboure, 
  

  

  Basses-Pyrenees, 
  x 
  300. 
  

  

  31. 
  Representative 
  teeth 
  from 
  the 
  radula 
  of 
  H. 
  incarnata 
  (MiilL), 
  Bex, 
  

  

  Switzerland, 
  x 
  300. 
  

  

  