﻿140 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Jan. 
  20, 
  

  

  Mr. 
  Gwyn 
  Jeffreys, 
  F.R.S., 
  has 
  made 
  out 
  the 
  following 
  species 
  of 
  

   Shells, 
  &c, 
  from 
  the 
  drift 
  of 
  Strethill 
  : 
  — 
  

  

  List 
  of 
  Shells, 
  Sfc, 
  from 
  the 
  Drift 
  at 
  Strethill. 
  

   Mollusca. 
  

  

  (Bivalves.) 
  

  

  1. 
  Anomia 
  ephippium. 
  A 
  single 
  valve, 
  very 
  soft. 
  

  

  2. 
  Ostrea 
  edulis. 
  Some 
  very 
  thick, 
  others 
  thinner 
  and 
  of 
  younger 
  growth. 
  

  

  3. 
  Pecten 
  opercularis. 
  Mostly 
  small 
  fragments. 
  

  

  4. 
  Mytilus 
  edulis. 
  

  

  5. 
  modiolus. 
  

  

  6. 
  Cardium 
  echinatum. 
  

  

  7. 
  edule. 
  Abundant 
  ; 
  some 
  small 
  valves 
  quite 
  perfect. 
  

  

  8. 
  Cyprina 
  Islandica. 
  Small 
  fragments 
  plentiful. 
  

  

  9. 
  Astarte 
  borealis. 
  

  

  10. 
  Yenus 
  exoleta. 
  

  

  1 
  1 
  . 
  lincta. 
  A 
  very 
  perfect 
  valve. 
  

  

  12. 
  verrucosa. 
  

  

  ll^nTBXhica,var.solidula.( 
  A 
  ^ 
  n( 
  i 
  ant; 
  several 
  Valves 
  P 
  erfecfc 
  and 
  

  

  15. 
  calcaria. 
  I 
  ^sh 
  m 
  appearance. 
  

  

  16. 
  Psammobia 
  Ferroensis. 
  Eight 
  or 
  nine 
  fragments. 
  

   17- 
  Mactra 
  solida. 
  

  

  18. 
  Mya 
  truncata. 
  A 
  single 
  hinge-fragment. 
  

  

  19. 
  Saxicava 
  rugosa, 
  var. 
  arctica. 
  

  

  20. 
  Pholas 
  crispata. 
  Four 
  fragments. 
  

  

  21. 
  Teredo 
  Norvegica. 
  Part 
  of 
  a 
  tube. 
  

  

  (Univalves.) 
  

  

  22. 
  Dentalium 
  entale. 
  Four 
  or 
  five 
  examples. 
  

  

  23. 
  Trochus 
  magus. 
  

  

  24. 
  umbilicatus. 
  V 
  A 
  single 
  broken 
  example 
  of 
  each. 
  

  

  25. 
  cinerarius, 
  var. 
  J 
  

  

  26. 
  Littorina 
  litorea. 
  Two 
  or 
  three 
  examples. 
  

  

  27. 
  rudis. 
  One 
  example. 
  

  

  28. 
  Turritella 
  terebra. 
  The 
  most 
  frequent 
  species. 
  

  

  29. 
  Aporrhais 
  pes-pelicani. 
  Three 
  examples. 
  

  

  30. 
  Purpura 
  lapillus. 
  Five 
  or 
  six 
  tolerably 
  perfect 
  examples. 
  

  

  31. 
  Murex 
  erinaceus. 
  Four 
  or 
  five 
  good 
  examples. 
  

  

  32. 
  Nassa 
  reticulata. 
  One 
  example. 
  

  

  33. 
  Buccinum 
  undatum. 
  Two 
  or 
  three 
  examples. 
  

  

  34. 
  Fusus 
  antiquus. 
  Much 
  broken 
  ; 
  one 
  specimen 
  perforated 
  by 
  Cliona 
  celata. 
  

  

  35. 
  Defrancia 
  turricula. 
  Three 
  examples. 
  

  

  ClRRIPEDES. 
  

  

  36. 
  Balanus 
  Hameri. 
  

  

  37. 
  porcatus. 
  

  

  38. 
  sulcatus. 
  

  

  39. 
  balanoides. 
  

  

  Annelid. 
  

  

  40. 
  Pomatoceros 
  triquetra, 
  on 
  Ostrea 
  edulis. 
  

  

  Sponge. 
  

  

  41 
  . 
  Cliona 
  celata 
  in, 
  Fusus 
  antiquus. 
  

  

  Mr. 
  Jeffreys 
  suspects 
  that 
  there 
  may 
  have 
  been 
  some 
  mistake 
  as 
  

   to 
  Trochus 
  umbilicatus 
  and 
  the 
  variety 
  of 
  T. 
  cinerarius, 
  because 
  they 
  

  

  