﻿Vol. 
  53.] 
  FAUNA 
  OP 
  THE 
  KEISLEY 
  LIMESTONE. 
  105 
  

  

  I 
  have 
  been 
  unable, 
  from 
  lack 
  of 
  time, 
  to 
  confirm 
  personally 
  the 
  

   accuracy 
  of 
  this 
  statement, 
  which 
  I 
  find 
  also 
  appears 
  in 
  the 
  

   Geological 
  Survey 
  Memoirs 
  dealing 
  with 
  those 
  districts, 
  but 
  I 
  intend 
  

   to 
  take 
  the 
  earliest 
  opportunity 
  of 
  visiting 
  these 
  localities. 
  The 
  

   scanty 
  lists 
  of 
  fossils 
  from 
  them 
  which 
  have 
  appeared 
  in 
  the 
  

   Explanations 
  of 
  Sheets 
  160, 
  161, 
  etc. 
  (1863), 
  p. 
  12 
  (Caherconree 
  ) 
  ; 
  

   sheets 
  148, 
  149 
  (1887), 
  pp. 
  21-24 
  (Courtown); 
  sheets 
  73, 
  74, 
  

   etc. 
  (1876), 
  pp. 
  28, 
  31, 
  and 
  33 
  ; 
  and 
  sheets 
  93, 
  94, 
  etc. 
  (1878), 
  

   p.H4(Toormakeady), 
  certainly 
  contain 
  several 
  of 
  the 
  Kildare 
  species, 
  

   and 
  the 
  specimens 
  of 
  the 
  rocks 
  which 
  I 
  have 
  seen 
  bear 
  a 
  remark- 
  

   able 
  resemblance 
  to 
  the 
  Keisley 
  and 
  Kildare 
  Limestones. 
  If 
  it 
  be 
  

   subsequently 
  established 
  by 
  more 
  minute 
  investigation 
  that 
  these 
  

   patches 
  of 
  limestone 
  at 
  Toormakeady, 
  Courtown, 
  and 
  Caherconree 
  

   are 
  of 
  the 
  same 
  age 
  as 
  that 
  at 
  Keisley, 
  none 
  of 
  the 
  conclusions 
  

   arrived 
  at 
  in 
  this 
  paper 
  will 
  have 
  to 
  be 
  rejected, 
  but 
  these 
  three 
  

   localities 
  will 
  have 
  to 
  be 
  quoted 
  as 
  additional 
  ' 
  outposts 
  ' 
  of 
  this 
  

   peculiar 
  fauna. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VI. 
  

  

  Pig. 
  1. 
  Orthis 
  (Hebertella?) 
  keisleyensis, 
  sp. 
  n. 
  Pedicle- 
  valve. 
  x3. 
  

   1 
  a. 
  Outline 
  of 
  side 
  view 
  of 
  pedicle-valve. 
  X 
  3. 
  

  

  1 
  b. 
  Natural 
  size. 
  

  

  2. 
  Atrypina 
  similis, 
  sp. 
  n. 
  Pedicle- 
  valve. 
  X 
  3. 
  

  

  2 
  a. 
  Brachial- 
  valve 
  (young 
  individual). 
  x3. 
  

  

  2 
  b. 
  Natural 
  size. 
  

  

  3. 
  Atrypina 
  similis, 
  sp. 
  n. 
  Brachial 
  valve. 
  x3. 
  

  

  3 
  a. 
  Natural 
  size. 
  

  

  4. 
  Syntrophia 
  affinis, 
  sp. 
  n. 
  Pedicle-valve. 
  X3. 
  

  

  4 
  a. 
  Natural 
  size. 
  

  

  5. 
  Dayia 
  pentagonalis, 
  sp. 
  n. 
  Brachial 
  valve. 
  x3. 
  

   ha. 
  Pedicle-valve. 
  x3. 
  

  

  5 
  b. 
  Anterior 
  margin 
  of 
  valves. 
  X 
  3. 
  

   5 
  c. 
  Natural 
  size. 
  

  

  6. 
  Loxonema 
  striatissimum 
  (Salter 
  MS.). 
  Natural 
  size. 
  

  

  7. 
  Platyceras 
  verisimile, 
  sp. 
  n. 
  x2. 
  

   7 
  a. 
  Side 
  view. 
  X 
  2. 
  

  

  7 
  b. 
  Natural 
  size. 
  

  

  8. 
  Murchisonia, 
  sp. 
  x3. 
  

  

  8 
  a. 
  Natural 
  size. 
  

  

  9. 
  Anodontopsis, 
  sp. 
  x3. 
  

  

  9 
  a. 
  Natural 
  size. 
  

  

  Discussion. 
  

  

  Mr. 
  Maer 
  could 
  not, 
  at 
  the 
  late 
  period 
  of 
  the 
  evening 
  at 
  which 
  

   the 
  paper 
  concluded, 
  say 
  much 
  upon 
  the 
  points 
  where 
  he 
  agreed 
  

   with 
  the 
  Author, 
  so 
  would 
  speak 
  at 
  once 
  regarding 
  matters 
  on 
  which 
  

   he 
  disagreed. 
  He 
  doubted 
  whether 
  the 
  limestones 
  of 
  Keisley 
  were 
  all 
  

   upon 
  one 
  horizon, 
  though 
  there 
  certainly 
  was 
  a 
  very 
  definite 
  fauna 
  

   intermediate 
  between 
  that 
  of 
  the 
  Applethwaite 
  Limestone 
  and 
  that 
  

   of 
  the 
  Staurocephalus- 
  Limestone 
  ; 
  whether 
  that 
  fauna 
  was 
  referable 
  

   to 
  Middle 
  or 
  Upper 
  Bala 
  depended 
  upon 
  the 
  line 
  taken 
  between 
  

   these 
  two 
  groups 
  — 
  which 
  had 
  been 
  originally 
  separated 
  one 
  from 
  

   another 
  by 
  Sedgwick 
  on 
  stratigraphical 
  grounds, 
  though 
  he 
  (the 
  

  

  