﻿0E 
  THE 
  WEDLOCK 
  SHALES. 
  385 
  

  

  Lower 
  Wenlock 
  Shales. 
  

  

  Buildwas 
  beds, 
  22 
  Spirorbis 
  arkonensis, 
  Nich. 
  

  

  Coldwell 
  Flags, 
  Westmoreland 
  .... 
  Spirorbis, 
  sp., 
  Wyatt-Edgell. 
  

  

  Upper 
  Wenlock 
  Shales. 
  

   Tickwood 
  beds, 
  25 
  Spirorbis 
  arhonensis, 
  Nich. 
  

  

  Wenlock 
  Limestone. 
  

   School 
  of 
  Mines 
  Cat. 
  p. 
  101 
  Spirorbis 
  Lewisii, 
  Sow. 
  

  

  Upper 
  Ludlow. 
  

   School 
  of 
  Mines 
  Cat. 
  p. 
  117 
  Spirorbis, 
  n. 
  sp., 
  Mnrch. 
  

  

  Bone-bed. 
  

   School 
  of 
  Mines 
  Cat. 
  p. 
  129 
  Spirorbis 
  Leivisii. 
  

  

  An 
  important 
  addition 
  to 
  my 
  cabinet 
  is 
  a 
  slide 
  containing 
  two 
  or 
  

   more 
  species 
  of 
  Spirorbis 
  and 
  several 
  specimens, 
  given 
  to 
  me 
  by 
  

   Mr. 
  Smith, 
  and 
  procured 
  by 
  him 
  from 
  the 
  washing 
  of 
  shales 
  from 
  

   Lincoln-Hill 
  Iron 
  Bridge. 
  It 
  is 
  beside 
  my 
  purpose 
  to 
  enter 
  into 
  

   details 
  respecting 
  these, 
  because 
  they 
  do 
  not 
  belong 
  to 
  the 
  shale- 
  

   washings 
  of 
  Mr. 
  Maw. 
  I 
  allude 
  to 
  their 
  existence 
  to 
  prevent 
  any 
  

   misconception 
  that 
  may 
  arise 
  in 
  the 
  mind 
  of 
  the 
  student 
  when 
  read- 
  

   ing 
  my 
  remarks 
  on 
  the 
  paucity 
  of 
  Spirorbes 
  in 
  the 
  shale-washings. 
  

  

  Genus 
  Teistactjijtes, 
  Schlotheim. 
  

  

  Tentaculites, 
  Kestricted 
  by 
  Nicholson, 
  American 
  Journ. 
  of 
  Science, 
  

   1872, 
  p. 
  201. 
  

  

  The 
  genus 
  Tentaculites, 
  like 
  many 
  other 
  Palaeozoic 
  genera, 
  has 
  

   had 
  a 
  very 
  chequered 
  palseontological 
  history. 
  By 
  its 
  author 
  cer- 
  

   tain 
  forms 
  were 
  regarded 
  as 
  the 
  tentacular 
  appendages 
  of 
  some 
  of 
  

   the 
  Crinoids. 
  Species 
  figured 
  in 
  the 
  ' 
  Silurian 
  System 
  ' 
  were 
  placed 
  

   amongst 
  the 
  " 
  incertse 
  sedis." 
  In 
  M'Coy's 
  ' 
  British 
  Palaeozoic 
  

   Possils' 
  they 
  were 
  similarly 
  placed; 
  but 
  one 
  of 
  the 
  authors 
  says, 
  

   " 
  I 
  can 
  see 
  no 
  reason 
  for 
  believing 
  these 
  bodies 
  to 
  be 
  portions 
  of 
  

   Crinoids, 
  as 
  suggested 
  by 
  many 
  authors, 
  much 
  less 
  spines 
  of 
  Lep- 
  

   tama, 
  as 
  suggested 
  by 
  others 
  ; 
  their 
  small 
  size, 
  general 
  form, 
  and 
  

   the 
  appearance 
  which 
  large 
  clusters 
  of 
  them 
  often 
  present 
  on 
  the 
  

   surface 
  of 
  the 
  beds, 
  gives 
  one 
  the 
  idea 
  of 
  their 
  belonging 
  to 
  the 
  

  

  Pteropoda 
  Their 
  being 
  unattached, 
  small 
  size, 
  and 
  straight, 
  

  

  regular 
  form, 
  separate 
  them 
  from 
  the 
  allied 
  genus 
  Cornulites 
  ,, 
  *. 
  

   The 
  same 
  view 
  of 
  the 
  zoological 
  position 
  of 
  Tentaculites 
  is 
  taken 
  by 
  

   Prof. 
  Nicholson 
  in 
  his 
  various 
  writings. 
  Salter, 
  however, 
  believed 
  

   these, 
  as 
  well 
  as 
  the 
  species 
  of 
  Cornulites, 
  to 
  belong 
  to 
  the 
  Tubicolar 
  

   Annelida 
  : 
  and 
  Mr. 
  Robert 
  Ethcridgef 
  , 
  seems 
  to 
  take 
  a 
  similar 
  view 
  

   in 
  his 
  address 
  to 
  the 
  Geological 
  Society. 
  

  

  Not 
  knowing 
  the 
  special 
  structure 
  of 
  the 
  shell 
  of 
  the 
  Pteropoda, 
  

   to 
  which 
  the 
  Palaeozoic 
  species 
  may 
  possibly 
  be 
  allied, 
  I 
  cannot 
  

   * 
  Brit. 
  Pal. 
  Fossils, 
  p. 
  68. 
  t 
  Presidential 
  Address, 
  1881. 
  

  

  