﻿50 
  

  

  PKOCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [NOV. 
  18, 
  

  

  which 
  exhibit 
  all, 
  or 
  nearly 
  all, 
  the 
  characters 
  used 
  as 
  specific 
  dis- 
  

   tinctions 
  almost 
  as 
  well 
  as 
  the 
  shells 
  themselves 
  would 
  have 
  done. 
  

   The 
  remaining 
  six 
  are 
  compared 
  with 
  species 
  which 
  appear 
  to 
  re- 
  

   semble 
  them, 
  but 
  have 
  not 
  been 
  given 
  other 
  than 
  generic 
  names. 
  

   This 
  course 
  is 
  in 
  direct 
  opposition 
  to 
  that 
  pursued 
  by 
  the 
  above- 
  

   mentioned 
  authors, 
  who, 
  avowedly, 
  did 
  not 
  attempt, 
  in 
  many 
  cases, 
  

   to 
  make 
  their 
  " 
  forms 
  " 
  of 
  the 
  same 
  value 
  as 
  natural-history 
  species 
  *, 
  

   but 
  nevertheless 
  used 
  them, 
  for 
  the 
  purpose 
  of 
  supporting 
  their 
  con- 
  

   clusions, 
  as 
  if 
  they 
  had 
  that 
  value. 
  

  

  As, 
  however, 
  in 
  treating 
  of 
  Tertiary 
  fossils, 
  a 
  comparison 
  with 
  re- 
  

   cent 
  species 
  is 
  inevitable, 
  it 
  is, 
  perhaps, 
  better 
  to 
  confine 
  specific 
  deter- 
  

   minations, 
  so 
  far 
  as 
  the 
  foundation 
  of 
  new 
  species 
  is 
  concerned, 
  to 
  

   well-characterized 
  specimens, 
  especially 
  as 
  it 
  is 
  very 
  probable 
  that 
  

   the 
  species 
  of 
  the 
  paleontologist, 
  particularly 
  when 
  the 
  opposite 
  

   course 
  is 
  adopted, 
  are 
  not 
  always 
  of 
  the 
  same 
  value 
  as 
  those 
  of 
  the 
  

   conchologist, 
  who 
  has, 
  in 
  many 
  cases, 
  all 
  the 
  extra 
  advantages 
  of 
  

   knowledge 
  of 
  the 
  animal, 
  colour, 
  and 
  other 
  characters, 
  of 
  which 
  the 
  

   palaeontologist 
  cannot 
  take 
  cognizance. 
  But 
  it 
  should 
  not 
  be 
  forgotten 
  

   that 
  the 
  percentage 
  of 
  recent 
  species 
  in 
  a 
  formation 
  may 
  be 
  consider- 
  

   ably 
  altered 
  in 
  consequence 
  of 
  these 
  differences 
  in 
  the 
  methods 
  of, 
  

   and 
  facilities 
  for, 
  specific 
  determination." 
  

  

  The 
  following 
  Table 
  contains 
  a 
  list 
  of 
  the 
  species, 
  whether 
  deter- 
  

   mined 
  or 
  undetermined, 
  and 
  a 
  description 
  of 
  their 
  matrices; 
  the 
  

   latter 
  being 
  taken 
  from 
  an 
  examination 
  of 
  the 
  substances 
  contained 
  

   in 
  or 
  composing 
  the 
  specimens. 
  

  

  Descriptive 
  

   Number. 
  

  

  Genera 
  and 
  Species. 
  

  

  Material 
  contained 
  in, 
  or 
  composing, 
  

   the 
  Specimens. 
  

  

  1. 
  

   2. 
  

   3. 
  

  

  4. 
  

  

  5. 
  

  

  6. 
  

  

  7. 
  

  

  8. 
  

  

  9. 
  

   10. 
  

   11. 
  

   12. 
  

   13. 
  

   14. 
  

   15. 
  

   16. 
  

   17. 
  

   18. 
  

  

  19. 
  

   20. 
  

   21. 
  

   22. 
  

  

  23. 
  

  

  24. 
  

  

  Murex 
  Grooti, 
  spec, 
  nov 
  

  

  Light-grey 
  marl. 
  

   Greyish 
  sand. 
  

   Dark-grey 
  mud. 
  

   Same 
  as 
  No. 
  1. 
  

   Greenish 
  sandy 
  marl. 
  

   Same 
  as 
  Nos. 
  1 
  and 
  2. 
  

   Greyish 
  sand 
  and 
  greyish 
  marl. 
  

   Greyish 
  marly 
  sand. 
  

   Greenish-grey 
  marl. 
  

   Reddish 
  calcareous 
  sand. 
  

   Reddish 
  marl. 
  

   Sandy 
  marl. 
  

  

  Greenish 
  and 
  grey 
  sand. 
  

   Grey 
  argillaceous 
  marl. 
  

   Reddish 
  sandy 
  marl. 
  

   White 
  limestone. 
  

   Greenish-grey 
  marly 
  sandstone. 
  

   Reddish 
  marly 
  sandstone 
  and 
  

  

  greenish 
  sandstone. 
  

   Same 
  as 
  No. 
  5. 
  

   Reddish 
  marl. 
  

   Reddish 
  sandy 
  clay. 
  

   Similar 
  to 
  No. 
  21, 
  but 
  more 
  

  

  sandy. 
  

   Same 
  as 
  No. 
  10. 
  

   ? 
  

  

  ? 
  paradoxicus, 
  spec, 
  nov. 
  

  

  ? 
  sp. 
  

  

  

  Javanis, 
  spec, 
  nov 
  

  

  Oliva 
  utriculus 
  (juv. 
  ?), 
  Gm 
  

  

  

  Natica 
  Duncani, 
  spec, 
  nov 
  

  

  

  Flemingiana 
  ?, 
  Recluz 
  

  

  Yicarya 
  (?) 
  callosa, 
  spec, 
  nov 
  

  

  Turritella 
  acuticingulata, 
  spec. 
  nov. 
  

   simplex, 
  spec, 
  nov 
  

  

  Phasianella? 
  sp., 
  orPaludina? 
  sp.. 
  

   Turbo 
  obliquus, 
  spec, 
  nov 
  

  

  Bulla, 
  sp 
  

  

  Cardium 
  subalternatum, 
  spec. 
  nov. 
  

  

  Cy 
  therea, 
  sp 
  

  

  Tellina, 
  sp 
  

  

  Cultellus? 
  sp 
  

  

  Amphistegina 
  vulgaris 
  

  

  Astrsea 
  Herklotsi, 
  spec, 
  nov 
  

  

  

  Op. 
  et 
  loc. 
  cit. 
  

  

  