﻿0E 
  THE 
  WEDLOCK 
  SHALES. 
  389 
  

  

  the 
  true 
  type 
  as 
  above, 
  for 
  very 
  special 
  reasons. 
  Beloiv 
  the 
  Wen- 
  

   lock 
  Limestone 
  there 
  are 
  other 
  Tentaculitce 
  equally 
  delicate, 
  but 
  

   having 
  characters 
  in 
  the 
  annulations 
  altogether 
  different 
  from 
  the 
  

   above 
  ; 
  and 
  unless 
  these 
  be 
  separated, 
  it 
  is 
  quite 
  possible 
  that 
  col- 
  

   lectors, 
  at 
  least, 
  will 
  confound 
  the 
  two 
  types. 
  This, 
  to 
  me, 
  is 
  of 
  little 
  

   importance 
  ; 
  I 
  seek 
  to 
  separate 
  them 
  on 
  account 
  of 
  their 
  significance 
  

   iu 
  the 
  palaeontology 
  of 
  the 
  shales. 
  

  

  10. 
  Te^tactjlites 
  we2v 
  t 
  lockiajs 
  t 
  tjs, 
  n. 
  sp. 
  (PI. 
  XV. 
  figs. 
  5, 
  6 
  & 
  11-13). 
  

  

  Tube 
  delicate, 
  elongated, 
  varying 
  in 
  length 
  from 
  one 
  to 
  two 
  and 
  a 
  

   half 
  lines. 
  Superior 
  annulations 
  in 
  two 
  series. 
  The 
  first 
  series 
  com- 
  

   posed 
  of 
  rings 
  alternately 
  tumid 
  and 
  depressed, 
  separated 
  from 
  each 
  

   other 
  by 
  intervals 
  of 
  about 
  a 
  half 
  of 
  a 
  line 
  ; 
  the 
  second 
  series 
  occupy- 
  

   ing 
  the 
  intervals 
  between 
  the 
  first, 
  and 
  very 
  rarely 
  indenting 
  the 
  

   margins 
  of 
  the 
  tube 
  to 
  any 
  appreciable 
  extent. 
  The 
  normal 
  number 
  

   is 
  three, 
  occasionally 
  two, 
  but 
  rarely 
  four. 
  Very 
  delicate 
  inferior 
  

   annulations 
  fill 
  in 
  the 
  remaining 
  space 
  ; 
  and 
  these 
  sometimes 
  cover 
  

   the 
  superior 
  annulations 
  transversely. 
  Average 
  diameter 
  of 
  the 
  tube 
  

   near 
  the 
  proximal 
  end 
  about 
  Jg-, 
  towards 
  the 
  distal 
  end 
  from 
  -£$ 
  to 
  

   •Jg- 
  of 
  an 
  inch. 
  Walls 
  varying 
  in 
  thickness 
  according 
  to 
  the 
  tumid 
  

   or 
  depressed 
  character 
  of 
  the 
  tube 
  ; 
  aperture 
  circular. 
  

  

  Loc. 
  The 
  figures 
  are 
  given 
  from 
  specimens 
  found 
  in 
  the 
  lowest 
  

   Buildwas 
  beds, 
  nos. 
  22, 
  36, 
  & 
  38 
  ; 
  Coalbrooke 
  Dale 
  beds, 
  no. 
  43 
  ; 
  

   Tickwood 
  beds, 
  no. 
  25. 
  Shales 
  above 
  Wenlock 
  Limestone, 
  no. 
  46. 
  

  

  This 
  species 
  is 
  found 
  in 
  fragments 
  in 
  most 
  of 
  the 
  washings 
  of 
  the 
  

   shales 
  ; 
  and 
  its 
  range 
  is 
  from 
  the 
  lowest 
  bed 
  of 
  the 
  Buildwas 
  series 
  

   to 
  the 
  shales 
  over 
  the 
  Wenlock 
  Limestone. 
  A 
  reference 
  to 
  the 
  figures 
  

   will 
  show 
  the 
  peculiarity 
  of 
  the 
  annulations 
  of 
  both 
  series; 
  and 
  this 
  

   character 
  is 
  so 
  constant 
  that 
  it 
  matters 
  not 
  how 
  small 
  the 
  fragment 
  

   is, 
  provided 
  it 
  is 
  large 
  enough 
  to 
  show 
  at 
  least 
  two. 
  The 
  first 
  series 
  of 
  

   rings 
  gradually 
  swell 
  out 
  to, 
  and 
  as 
  gradually 
  recede 
  from, 
  a 
  central 
  

   line. 
  I 
  have 
  some 
  fragments 
  not 
  more 
  than 
  -gL- 
  of 
  an 
  inch 
  in 
  dia- 
  

   meter 
  ; 
  and 
  the 
  character 
  is 
  as 
  constant 
  in 
  these 
  as 
  in 
  those 
  of 
  -^ 
  or 
  

   ^g- 
  of 
  an 
  inch 
  in 
  diameter. 
  This 
  is 
  a 
  true 
  Wenlock-shale 
  type 
  ; 
  and 
  

   I 
  think 
  it 
  may 
  appropriately 
  be 
  named 
  as 
  above. 
  There 
  is, 
  how- 
  

   ever, 
  another 
  type 
  that 
  has 
  a 
  range 
  equally 
  significant 
  ; 
  but 
  its 
  cha- 
  

   racters 
  are 
  altogether 
  different. 
  

  

  11. 
  Tentactjlites 
  mtjltiaxnelattjs, 
  n. 
  sp. 
  (PI. 
  XV. 
  fig. 
  7.) 
  

  

  Tube 
  small, 
  varying 
  in 
  length 
  from 
  a 
  half 
  to 
  two 
  and 
  a 
  half 
  lines. 
  

   Superior 
  annulations 
  closely 
  compacted 
  together, 
  without 
  the 
  ordi- 
  

   nary 
  interspaces 
  or 
  inferior 
  annulations 
  seen 
  in 
  other 
  species 
  ; 
  average 
  

   number 
  about 
  20 
  in 
  the 
  space 
  of 
  a 
  line. 
  Walls 
  very 
  thin 
  : 
  aperture 
  

   circular. 
  Diameter 
  of 
  tube 
  ^ 
  to 
  -^ 
  of 
  inch. 
  

  

  Loc. 
  Buildwas 
  Beds, 
  no. 
  22 
  ; 
  Tickwood 
  beds, 
  25. 
  Shales 
  over 
  the 
  

   Wenlock 
  Limestone, 
  no. 
  46. 
  

  

  I 
  was 
  for 
  a 
  very 
  long 
  time 
  very 
  diffident 
  about 
  placing 
  this 
  species 
  

   with 
  Tentaculites. 
  My 
  reasons 
  for 
  doing 
  so 
  now 
  are 
  these 
  : 
  — 
  1. 
  The 
  tube 
  

   is 
  always 
  found 
  free, 
  never 
  attached 
  ; 
  2. 
  The 
  superior 
  annulations, 
  

  

  Q.J.G.S. 
  No. 
  151. 
  2n 
  

  

  