﻿380 
  G. 
  E. 
  VINE 
  OX 
  THE 
  AXXELLDA 
  TUBICOLA. 
  

  

  Tube 
  hollow, 
  attached 
  by 
  a 
  portion 
  of 
  its 
  proximal 
  end 
  to 
  foreign 
  

   bodies, 
  the 
  greater 
  portion 
  free. 
  Very 
  many 
  fragments 
  frequently 
  

   found 
  in 
  the 
  shales, 
  varying 
  from 
  about 
  a 
  quarter 
  to 
  three 
  quarters 
  

   of 
  an 
  inch. 
  Annulations 
  superior, 
  separated 
  by 
  depressed 
  inter- 
  

   vals, 
  which 
  give 
  to 
  the 
  fragments 
  a 
  kind 
  of 
  scalariform 
  aspect 
  ; 
  

   strongly 
  marked 
  with 
  "longitudinal" 
  striae, 
  the 
  width 
  of 
  which 
  

   varies 
  from 
  y-J-^- 
  to 
  T 
  -I 
  T 
  of 
  an 
  inch 
  ; 
  the 
  tube 
  is 
  again 
  marked 
  with 
  

   transverse 
  intersected 
  striae, 
  varying 
  from 
  ^-i- 
  - 
  to 
  -^jro 
  °f 
  an 
  inca 
  in 
  

   width. 
  This 
  cross-hatching 
  gives 
  to 
  the 
  tube 
  a 
  very 
  peculiar 
  cha- 
  

   racter, 
  and 
  in 
  all 
  probability 
  represents 
  " 
  cellular 
  varices 
  " 
  of 
  Salter 
  

   and 
  others. 
  

  

  Loc. 
  Lower 
  Wenlock 
  Shales, 
  no. 
  40 
  : 
  Upper 
  Wenlock 
  Shales, 
  

   Tickwood 
  beds, 
  no. 
  41. 
  Hare 
  in 
  both 
  beds. 
  

  

  Remarks. 
  It 
  is 
  quite 
  possible 
  that 
  0, 
  scalar 
  ij 
  'or 
  mis 
  may 
  be 
  upon 
  a 
  

   cursory 
  examination 
  identified 
  either 
  with 
  Tentaeulites 
  anglicus 
  or 
  the 
  

   smaller 
  specimens 
  of 
  Gornulites 
  serpularius 
  of 
  authors. 
  The 
  anoma- 
  

   lous 
  characters 
  of 
  both 
  of 
  these 
  species 
  cause 
  me 
  to 
  approach 
  them 
  

   with 
  a 
  great 
  amount 
  of 
  diffidence 
  ; 
  and 
  I 
  am 
  not 
  certain 
  that 
  I 
  shall 
  

   improve 
  the 
  anomaly 
  by 
  the 
  doubtful 
  synonyms 
  I 
  have 
  placed 
  under 
  

   the 
  species 
  described 
  above. 
  The 
  following 
  are 
  my 
  principal 
  reasons 
  

   for 
  removing 
  this 
  species 
  from 
  the 
  region 
  of 
  doubt. 
  The 
  peculiar 
  

   annulations 
  and 
  striation 
  of 
  C. 
  scalariformis 
  are 
  unique. 
  I 
  know 
  

   of 
  no 
  other 
  species 
  with 
  which 
  I 
  can 
  compare 
  it. 
  In 
  Salter's 
  T. 
  

   anglicus 
  the 
  external 
  walls 
  of 
  the 
  tube 
  are 
  longitudinally 
  marked, 
  

   and 
  the 
  transverse 
  section 
  shows 
  by 
  the 
  small 
  opening 
  that 
  the 
  real 
  

   diameter 
  of 
  the 
  tube 
  corresponds 
  with 
  the 
  contraction 
  of 
  the 
  verte- 
  

   bra-like 
  section, 
  which 
  professes 
  to 
  be 
  an 
  enlargement 
  of 
  a 
  fragment 
  

   of 
  the 
  more 
  perfect 
  specimen. 
  Otherwise 
  than 
  this 
  there 
  is 
  no 
  corre- 
  

   spondence 
  between 
  the 
  two 
  types. 
  Again, 
  the 
  structure 
  of 
  the 
  walls 
  

   of 
  the 
  tube 
  when 
  examined 
  in 
  section 
  is 
  altogether 
  diiferent 
  in 
  C. 
  

   scalariformis 
  from 
  that 
  of 
  any 
  typical 
  Tentaeulites. 
  Salter's 
  species 
  

   is 
  straight 
  and 
  unattached 
  (?). 
  This 
  is 
  sufficient 
  in 
  itself 
  to 
  show 
  

   amongst 
  which 
  group 
  it 
  should 
  be 
  placed 
  if 
  it 
  be 
  a 
  true 
  Tentaeulites 
  ; 
  

   but 
  I 
  have 
  satisfactory 
  evidence 
  that 
  the 
  species 
  described 
  above 
  was 
  

   not 
  free. 
  

  

  Since 
  writing 
  the 
  above 
  I 
  have 
  been 
  furnished 
  with 
  examples 
  of 
  

   the 
  species 
  from 
  Gotland 
  by 
  Professor 
  Lindstrom, 
  of 
  Stockholm. 
  

   One 
  fragment 
  is 
  attached 
  to 
  a 
  valve 
  of 
  Meristella 
  (Whitjieldia) 
  

   tumida, 
  and 
  the 
  proximal 
  end 
  is 
  covered 
  by 
  a 
  coral 
  growth 
  ; 
  the 
  

   other 
  specimens 
  are 
  unattached, 
  but 
  are 
  identical 
  with 
  our 
  own. 
  

   The 
  following 
  are 
  the 
  microscopical 
  characters 
  of 
  this 
  species 
  : 
  — 
  

  

  Tube 
  hollow, 
  having 
  a 
  somewhat 
  uniform 
  diameter, 
  which 
  corre- 
  

   sponds 
  with 
  the 
  growth 
  of 
  the 
  shell, 
  widening 
  gradually 
  from 
  a 
  

   diminutive 
  point 
  to 
  the 
  distal 
  extremity. 
  Interior 
  filled 
  either 
  with 
  

   clay 
  or 
  calcite. 
  Walls 
  of 
  the 
  tube 
  still 
  retaining 
  their 
  normal 
  cha- 
  

   racter, 
  varying 
  in 
  thickness 
  from 
  ^ 
  to 
  -j 
  X) 
  of 
  an 
  inch. 
  Superior 
  

   annulations 
  permeated 
  by 
  circular, 
  oval, 
  or 
  angular 
  cavities, 
  a 
  cha- 
  

   racter 
  which 
  will 
  be 
  seen 
  to 
  more 
  advantage 
  in 
  the 
  drawing. 
  In 
  

   the 
  transverse 
  section 
  of 
  the 
  species 
  the 
  longitudinal 
  striae 
  appear 
  

  

  