﻿388 
  G. 
  K. 
  VINE 
  ON 
  THE 
  ANNELIDA 
  ITTBICOLA 
  

  

  also 
  rare. 
  Shales 
  over 
  the 
  Wenlock 
  Limestone, 
  no. 
  46, 
  rather 
  more 
  

   frequent. 
  

  

  In 
  accepting 
  this 
  species 
  as 
  a 
  Wenlock-shale 
  type, 
  I 
  rely 
  entirely 
  

   upon 
  the 
  authority 
  of 
  fig. 
  11, 
  pi. 
  xvi. 
  of 
  i 
  Siluria,' 
  1859. 
  In 
  these 
  figures 
  

   we 
  have 
  a 
  magnified 
  portion 
  given 
  as 
  a 
  section. 
  There 
  are 
  three 
  

   superior 
  annulations 
  ; 
  and 
  the 
  lateral 
  spine-like 
  prolongations 
  would 
  

   reveal 
  the 
  typical 
  structural 
  characters 
  of 
  the 
  genus 
  if 
  examined 
  by 
  

   the 
  microscope, 
  which 
  will 
  be 
  referred 
  to 
  further 
  on. 
  A 
  careful 
  ex- 
  

   amination 
  of 
  another 
  figure 
  will 
  show 
  the 
  intervening 
  inferior 
  annu- 
  

   lations. 
  In 
  E. 
  Emmons's 
  ' 
  Manual 
  of 
  Geology,' 
  2nd 
  ed. 
  New 
  York, 
  

   I860, 
  p. 
  113, 
  fig. 
  102, 
  a 
  specimen 
  of 
  T. 
  oniatus 
  is 
  figured, 
  eight 
  lines 
  

   in 
  length, 
  and 
  the 
  diameter 
  of 
  the 
  tube 
  and 
  number 
  of 
  annulations 
  

   to 
  the 
  line 
  are 
  about 
  the 
  same 
  as 
  our 
  own. 
  This 
  is 
  from 
  the 
  AVater- 
  

   limc 
  series, 
  over 
  the 
  Niagara 
  group 
  ; 
  and 
  it 
  forms 
  one 
  of 
  the 
  series 
  

   of 
  the 
  Helderberg, 
  or 
  upper 
  division 
  of 
  the 
  Silurian 
  System. 
  If 
  

   Emmons's 
  fossil 
  is 
  drawn 
  from 
  an 
  American 
  specimen, 
  and 
  the 
  mea- 
  

   surements 
  can 
  be 
  relied 
  upon, 
  there 
  is 
  again 
  a 
  close 
  correspondence 
  

   between 
  the 
  two 
  faunas, 
  the 
  British 
  and 
  American 
  ; 
  for 
  the 
  figure 
  is 
  

   as 
  like 
  onr 
  own 
  as 
  it 
  can 
  possibly 
  be. 
  It 
  is 
  this 
  type 
  only 
  that 
  I 
  

   accept 
  as 
  T. 
  oniatus; 
  my 
  specimen 
  of 
  the 
  Dudley-Limestone 
  Tai- 
  

   taculites, 
  named 
  T. 
  oniatus 
  by 
  collectors, 
  is 
  very 
  different 
  from 
  this. 
  

   T. 
  annulatus 
  of 
  Hisinger's 
  ' 
  Lethiea 
  Suecica,' 
  from 
  the 
  Silurian 
  

   Sandstone 
  of 
  Gotland, 
  is 
  also 
  like 
  some 
  of 
  the 
  fragments. 
  

  

  9. 
  Tentaculites 
  tenuis 
  ?, 
  Sowerby. 
  

  

  Type, 
  fig. 
  12, 
  pi. 
  xvi. 
  Siluria, 
  cd. 
  1859. 
  

  

  A 
  reference 
  to 
  the 
  above 
  figure 
  will 
  show 
  that 
  the 
  annulations 
  of 
  

   this 
  species 
  arc 
  closer 
  together 
  than 
  in 
  the 
  above 
  ; 
  and 
  in 
  the 
  text 
  

   the 
  author 
  of 
  'Siluria' 
  says, 
  " 
  T. 
  oniatus 
  abounds 
  in 
  the 
  Dudley 
  

   Limestone, 
  whilst 
  a 
  small 
  species, 
  T. 
  tenuis, 
  occurs 
  in 
  the 
  Upper 
  

   Ludlow 
  " 
  *. 
  I 
  cannot 
  verify 
  the 
  identifications 
  of 
  those 
  authors 
  who 
  

   refer 
  the 
  delicate 
  species 
  found 
  in 
  the 
  shales 
  to 
  this 
  type 
  ; 
  and 
  I 
  

   have 
  no 
  specimens 
  of 
  the 
  Ludlow 
  type 
  to 
  compare 
  with 
  my 
  own. 
  

   Seeing, 
  therefore, 
  that 
  the 
  specimens 
  to 
  be 
  described 
  below 
  are 
  

   found 
  only 
  in 
  the 
  shales 
  over 
  the 
  Wenlock 
  Limestone, 
  I 
  think 
  it 
  

   best 
  to 
  retain 
  the 
  species, 
  and 
  describe 
  my 
  own 
  as 
  a 
  variety 
  : 
  — 
  

  

  Var. 
  ATTENUATUS. 
  

  

  Tube 
  very 
  delicate 
  and 
  attenuated, 
  of 
  variable 
  length, 
  but 
  speci- 
  

   mens 
  found 
  in 
  the 
  shale-washings 
  are 
  from 
  about 
  one 
  and 
  a 
  half 
  to 
  

   two 
  lines 
  long. 
  Annulations 
  superior, 
  about 
  twelve 
  in 
  the 
  space 
  of 
  

   a 
  line. 
  Average 
  diameter 
  of 
  the 
  tube 
  near 
  the 
  proximal 
  end 
  -J- 
  ff 
  , 
  

   near 
  the 
  distal 
  end 
  T 
  x 
  8 
  of 
  an 
  inch. 
  Walls 
  of 
  the 
  tube 
  thin, 
  aperture 
  

   round, 
  and 
  the 
  length 
  of 
  the 
  last 
  or 
  newest 
  chamber 
  nearly 
  occu- 
  

   pying 
  the 
  same 
  space 
  as 
  three 
  ordinary 
  annulations. 
  

  

  Loc. 
  Shales 
  over 
  the 
  Wenlock 
  Limestone, 
  no. 
  46. 
  

  

  If 
  this 
  be 
  T. 
  tenuis, 
  or 
  a 
  variety 
  of 
  the 
  same, 
  I 
  shall 
  be 
  glad 
  to 
  fix 
  

  

  * 
  Ed. 
  1859, 
  p. 
  259. 
  

  

  