﻿68 
  MR. 
  F. 
  E. 
  COWPEE 
  EEED 
  ON 
  THE 
  [Feb. 
  1897, 
  

  

  It 
  cannot 
  be 
  identified 
  with 
  Discina 
  gibba 
  (Lindstr.) 
  of 
  the 
  

   Leptcena-Limestone, 
  for 
  that 
  species 
  has 
  two 
  small 
  nodules 
  below 
  the 
  

   apical 
  foramen, 
  and 
  the 
  beak 
  of 
  the 
  pedicle-valve 
  is 
  subcentral 
  and 
  

   nearer 
  the 
  posterior 
  than 
  the 
  anterior 
  margin. 
  Davidson 
  1 
  figures 
  a 
  

   small 
  species 
  of 
  Orbiculoidea 
  (Discina, 
  Dav.), 
  from 
  Keisley, 
  which 
  

   is 
  apparently 
  distinct 
  from 
  that 
  above 
  described. 
  

  

  LlNGTJLA?, 
  Sp. 
  

  

  Prof. 
  Harkness 
  2 
  records 
  Lingula 
  brevis 
  ? 
  (Portl.) 
  from 
  the 
  Keisley 
  

   Limestone. 
  I 
  have 
  seen 
  the 
  specimen 
  thus 
  identified 
  at 
  Carlisle,. 
  

   and 
  am 
  very 
  doubtful 
  about 
  it. 
  It 
  might 
  even 
  not 
  be 
  a 
  brachiopod 
  

   at 
  all, 
  but 
  a 
  lamellibranch, 
  like 
  Ambonychia 
  ? 
  nucc 
  (Lindstr.), 
  which 
  

   Lindstrom 
  3 
  figures 
  and 
  describes 
  from 
  the 
  Zepta?n«-Limestone. 
  

  

  Oethis 
  calligeamma, 
  Dalm. 
  

  

  This 
  species 
  is 
  not 
  common 
  at 
  Keisley. 
  

  

  Oethis 
  calligeamma, 
  var. 
  

  

  In 
  addition 
  to 
  specimens 
  with 
  the 
  ordinary 
  features 
  of 
  this 
  

   well-known 
  species, 
  there 
  has 
  been 
  found 
  the 
  imperfect 
  brachial 
  

   valve 
  of 
  an 
  Orihis 
  having 
  the 
  shape 
  and 
  appearance 
  of 
  typical 
  

   individuals 
  of 
  this 
  species, 
  but 
  furnished 
  with 
  thirty 
  to 
  forty 
  rounded, 
  

   straight, 
  simple 
  ribs 
  of 
  regular 
  width, 
  separated 
  by 
  interspaces 
  which 
  

   at 
  the 
  margin 
  of 
  the 
  valve 
  are 
  more 
  than 
  double 
  the 
  breadth 
  of 
  

   the 
  ribs, 
  except 
  near 
  the 
  hinge-line, 
  where 
  the 
  last 
  six 
  or 
  seven 
  

   ribs 
  are 
  somewhat 
  crowded 
  together 
  and 
  of 
  rather 
  smaller 
  size. 
  

  

  Oethis 
  Actoni^;, 
  Sowerby. 
  

  

  This 
  is 
  a 
  rare 
  species 
  in 
  the 
  Keisley 
  rock. 
  Probably 
  Orthis 
  

   Oswaldi 
  (Yon 
  Buch), 
  which 
  occurs 
  in 
  Stage 
  F 
  of 
  the 
  East 
  Baltic 
  

   provinces, 
  is 
  a 
  synonym, 
  as 
  Schmidt 
  4 
  mentions. 
  It 
  is 
  found 
  also 
  in 
  

   the 
  Kildare 
  and 
  Leptcena-limestoxies. 
  

  

  Oethis 
  (Bilobites) 
  biloba, 
  Linn. 
  

  

  Though 
  a 
  characteristically 
  Silurian 
  species, 
  this 
  is 
  not 
  unknown 
  

   from 
  Ordovician 
  beds, 
  and 
  Davidson 
  5 
  records 
  its 
  occurrence 
  at 
  Cef 
  a 
  

   Bhyddan 
  and 
  other 
  places 
  in 
  Bala 
  rocks. 
  I 
  have 
  seen 
  several 
  well- 
  

   preserved 
  specimens 
  from 
  Keisley, 
  two 
  of 
  which 
  I 
  found 
  myself. 
  

   It 
  occurs 
  in 
  the 
  Lejitcena-Limestone. 
  

  

  Oethis 
  (Platysteophia) 
  bifoeata, 
  Schlotheim. 
  

  

  A 
  fairly 
  common 
  species 
  at 
  Keisley. 
  The 
  Kildare 
  and 
  Leptcena- 
  

   Limestones 
  and 
  Schmidt's 
  Stage 
  F 
  also 
  contain 
  it. 
  

  

  1 
  ' 
  Mon. 
  Brit. 
  Foss. 
  Brack,' 
  vol. 
  iii. 
  (1864-71) 
  pi. 
  1. 
  fig. 
  27. 
  

  

  2 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxi. 
  (1865) 
  p. 
  248. 
  

  

  3 
  « 
  Fragm. 
  Silur.' 
  (1880) 
  p. 
  17, 
  pi. 
  xiii. 
  figs. 
  53, 
  54. 
  

  

  4 
  ' 
  On 
  the 
  Silurian 
  (and 
  Cambrian) 
  Strata 
  of 
  the 
  Baltic 
  Provinces 
  of 
  Russia/" 
  

   Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxviii. 
  (1882) 
  p. 
  514. 
  

  

  5 
  ' 
  Mon. 
  Brit. 
  Foss. 
  Brack,' 
  vol. 
  iii. 
  (1864-71) 
  p, 
  206. 
  

  

  