﻿Vol. 
  53.] 
  FAUNA 
  OF 
  THE 
  KEISLEY 
  LIMESTONE. 
  79 
  

  

  that 
  the 
  apical 
  angle 
  is 
  rather 
  larger, 
  giving 
  consequently 
  a 
  broader 
  

   and 
  shorter 
  form 
  to 
  the 
  shell. 
  The 
  seven 
  ventricose 
  whorls 
  

   furnished 
  with 
  three 
  revolving 
  carinse 
  are 
  apparently 
  quite 
  similar 
  

   to 
  those 
  in 
  the 
  Dalecarlian 
  individuals. 
  

  

  Etjomphaltjs 
  cf. 
  obtusangulus, 
  Lindstrom. 
  

  

  There 
  are 
  several 
  small 
  specimens 
  of 
  an 
  Euomphalus 
  in 
  the 
  state 
  

   of 
  casts, 
  which 
  may 
  well 
  be 
  compared 
  with 
  Lindstrom's 
  species 
  

   E. 
  obtusangulus, 
  1 
  but 
  they 
  are 
  not 
  sufficiently 
  well 
  preserved 
  to 
  admit 
  

   of 
  any 
  positive 
  statement 
  as 
  to 
  their 
  specific 
  identity. 
  E. 
  obtusangulus 
  

   is 
  a 
  Leptcena-IAmestone 
  species. 
  

  

  Euomphalus 
  nitijjulus, 
  Lindstrom 
  ? 
  

  

  I 
  have 
  little 
  doubt 
  that 
  the 
  fossil 
  which 
  is 
  here 
  referred 
  with 
  

   a 
  query 
  to 
  Lindstrom's 
  2 
  species 
  from 
  the 
  Z^pteena-Limestone 
  will 
  

   ultimately 
  be 
  found 
  really 
  identical 
  with 
  it. 
  It 
  appears 
  very 
  similar 
  

   to 
  Billings's 
  Strayparollus 
  Hippolyta? 
  

  

  Etjomphaltjs 
  subsulcatus 
  (His.) 
  ? 
  

  

  There 
  is 
  a 
  portion 
  of 
  a 
  shell 
  in 
  the 
  Carlisle 
  Museum 
  which 
  may 
  

   belong 
  to 
  this 
  species, 
  quoted 
  by 
  M'Coy 
  4 
  as 
  common 
  in 
  the 
  Chair 
  

   of 
  Kildare 
  Limestone. 
  The 
  fragment 
  that 
  I 
  have 
  seen 
  is 
  merely 
  

   part 
  of 
  a 
  shell 
  coiled 
  in 
  a 
  flat 
  spiral, 
  with 
  several 
  carinse 
  running 
  

   round 
  the 
  whorls. 
  

  

  Plattceras 
  verisimile, 
  sp. 
  n. 
  (PI. 
  YI. 
  figs. 
  7,7 
  a, 
  & 
  7 
  b.) 
  

  

  Shell 
  neritiform, 
  transverse, 
  about 
  twice 
  as 
  broad 
  as 
  high 
  ; 
  spire 
  

   low 
  and 
  short 
  ; 
  of 
  three 
  or 
  four 
  whorls 
  rapidly 
  decreasing 
  in 
  size. 
  

   Body-whorl 
  very 
  large, 
  twice 
  as 
  broad 
  as 
  high, 
  and 
  nearly 
  three 
  

   times 
  as 
  large 
  as 
  the 
  succeeding 
  whorl. 
  Suture 
  only 
  slightly 
  

   impressed. 
  Surface 
  of 
  shell 
  ornamented 
  with 
  fine 
  longitudinal 
  lines 
  

   which 
  are 
  rather 
  irregular 
  in 
  size 
  and 
  very 
  slightly 
  sigmoidal. 
  

  

  This 
  species 
  much 
  resembles 
  the 
  Swedish 
  form 
  PI. 
  caniculatum 
  

   (Lindstrom), 
  5 
  but 
  its 
  sutural 
  line 
  is 
  not 
  so 
  deeply 
  impressed 
  nor 
  is 
  

   its 
  body-whorl 
  so 
  long. 
  The 
  mouth 
  of 
  the 
  shell 
  is 
  not 
  preserved. 
  

   The 
  ornamentation 
  is 
  different 
  from 
  that 
  of 
  PI. 
  cornutum 
  (Hisinger), 
  6 
  

   which 
  it 
  otherwise 
  resembles. 
  The 
  American 
  species 
  Platyostoma 
  

   niagarense' 
  7 
  appears 
  to 
  show 
  much 
  the 
  same 
  characters. 
  

  

  Plattceras 
  cf. 
  cornutum, 
  Hisinger. 
  

  

  This 
  very 
  variable 
  species 
  is 
  held 
  to 
  be 
  synonymous 
  with 
  Natica 
  

   parva 
  (Sowerby), 
  and 
  with 
  several 
  other 
  British 
  species. 
  Our 
  

   specimen 
  resembles 
  most 
  closely 
  the 
  species 
  of 
  Sowerby's 
  just 
  

  

  1 
  ' 
  Fragm. 
  Silur.' 
  (1880) 
  p. 
  12, 
  pi. 
  xvii. 
  figs. 
  19-20. 
  

  

  2 
  Ibid. 
  p. 
  12, 
  pi. 
  xv. 
  figs. 
  24-26. 
  

  

  3 
  ' 
  Geol. 
  of 
  Canada 
  : 
  Palseoz. 
  Foss.,' 
  vol. 
  i. 
  p. 
  160, 
  fig. 
  144. 
  

  

  4 
  ' 
  Syn. 
  Silur. 
  Foss. 
  Irel.' 
  (1846) 
  p. 
  14. 
  

  

  5 
  Op.jamcit. 
  pi. 
  xvii. 
  figs. 
  13-16. 
  

  

  6 
  ' 
  Lethsea 
  Suecica' 
  (1837) 
  p. 
  41, 
  pi. 
  xii. 
  fig. 
  11 
  (Pileopsis 
  cornuta). 
  

  

  7 
  Hall, 
  ' 
  Pal. 
  N.Y.,' 
  vol. 
  ii. 
  (1852) 
  p. 
  287, 
  pi. 
  lx. 
  figs. 
  1 
  a-v. 
  

  

  