﻿'.390 
  It. 
  R. 
  VINE 
  ON 
  THE 
  ANNELIDA 
  TUBIC01A 
  

  

  though 
  compacted 
  together, 
  are 
  of 
  the 
  same 
  character, 
  structurally, 
  

   as 
  in 
  other 
  true 
  TentacuUtce 
  ; 
  3. 
  The 
  tube, 
  though 
  always 
  filled 
  either 
  

   with 
  calcite 
  or 
  clay, 
  was 
  evidently, 
  in 
  its 
  natural 
  state, 
  hollow. 
  My 
  

   doubts 
  are 
  on 
  account 
  of 
  the 
  following 
  facts 
  elicited 
  by 
  a 
  compara- 
  

   tive 
  study 
  of 
  the 
  numerous 
  specimens 
  : 
  — 
  1. 
  There 
  are 
  none 
  of 
  these 
  

   Silurian 
  specimens 
  that 
  can 
  in 
  any 
  way 
  be 
  confounded 
  with 
  Conchico- 
  

   litcs 
  as 
  limited 
  in 
  this 
  paper; 
  but 
  to 
  some 
  extent 
  the 
  exterior 
  

   annulations 
  are 
  very 
  much 
  like 
  those 
  of 
  some 
  specimens 
  of 
  that 
  

   genus; 
  structurally 
  they 
  are 
  different. 
  2. 
  Some 
  of 
  the 
  Carboni- 
  

   ferous 
  Ortonice 
  that 
  are 
  found 
  free 
  in 
  the 
  shales 
  are 
  also 
  like 
  the 
  

   Silurian 
  specimens 
  described 
  above 
  as 
  Tentaculites. 
  3. 
  The 
  one 
  fact 
  

   obtained 
  by 
  the 
  study 
  of 
  specimens 
  found 
  in 
  the 
  shales 
  over 
  the 
  

   AVenlock 
  Limestone 
  which 
  compels 
  me 
  to 
  place 
  my 
  doubt 
  upon 
  re- 
  

   cord 
  is 
  this 
  : 
  from 
  these 
  shales 
  I 
  have 
  one 
  fragment 
  of 
  T. 
  ornatus, 
  

   one 
  line 
  in 
  length, 
  half 
  of 
  which 
  is 
  true 
  T. 
  ornatus, 
  the 
  other 
  half 
  

   apparently 
  T. 
  multiannulatus. 
  I 
  cannot 
  explain 
  the 
  fact 
  ; 
  but 
  I 
  feel 
  

   that 
  it 
  is 
  incumbent 
  on 
  me 
  to 
  place 
  it 
  upon 
  record. 
  

  

  Genus 
  PsAMMOsirnoN 
  *, 
  gen. 
  nov. 
  

  

  After 
  completing 
  my 
  paper, 
  as 
  above, 
  on 
  the 
  Annelida 
  Tubicola, 
  

   I 
  was 
  obliged 
  to 
  lay 
  aside 
  a 
  mass 
  of 
  materials, 
  chiefly 
  from 
  the 
  

   Tickwood 
  beds, 
  on 
  account 
  of 
  their 
  many 
  peculiarities. 
  Amongst 
  

   these 
  were 
  a 
  group 
  of 
  Annelid 
  remains 
  that 
  I 
  was 
  unable 
  to 
  refer 
  to 
  

   any 
  existing 
  genus, 
  cither 
  recent 
  or 
  fossil. 
  They 
  were 
  of 
  an 
  arena- 
  

   ceous 
  texture, 
  with 
  very 
  decided 
  characters, 
  both 
  external 
  and 
  

   internal 
  ; 
  and 
  I 
  was 
  in 
  doubt 
  whether 
  they 
  should 
  be 
  referred 
  

   to 
  the 
  Protozoa 
  or 
  placed 
  with 
  the 
  Annelida. 
  Since 
  then 
  I 
  have 
  

   examined 
  an 
  immense 
  number 
  of 
  specimens, 
  and 
  I 
  feel 
  convinced 
  

   that 
  they 
  may 
  find 
  a 
  fitting 
  resting-place 
  with 
  the 
  latter 
  group. 
  

   Since, 
  however, 
  there 
  is 
  no 
  genus 
  known 
  to 
  me 
  under 
  which 
  the 
  

   species 
  could 
  be 
  placed, 
  I 
  have 
  been 
  compelled 
  to 
  found 
  a 
  new 
  one 
  

   for 
  their 
  reception. 
  

  

  Generic 
  Characters. 
  Body 
  irregularly 
  disposed, 
  crowded 
  or 
  tubular, 
  

   composed 
  of 
  minute 
  grains 
  of 
  sand 
  ; 
  adherent 
  to 
  shells, 
  stones, 
  or 
  

   corals, 
  or 
  free, 
  but 
  flattened 
  at 
  the 
  base, 
  showing 
  evidence 
  in 
  the 
  

   free 
  specimens 
  of 
  former 
  attachment. 
  

  

  The 
  genus 
  Serpula 
  has 
  a 
  protecting 
  tube 
  composed 
  of 
  carbonate 
  

   of 
  lime 
  ; 
  but 
  the 
  Sabellarice 
  and 
  Terebettee 
  have, 
  generally 
  speaking, 
  

   arenaceous 
  tubes 
  ; 
  these 
  genera, 
  however, 
  are 
  of 
  too 
  decided 
  a 
  cha- 
  

   racter 
  to 
  admit 
  without 
  violence 
  the 
  Palaeozoic 
  species. 
  Every 
  other 
  

   genus 
  referred 
  to 
  by 
  Prof. 
  Nicholson 
  and 
  Mr. 
  Robert 
  Etheridge, 
  

   Jun., 
  in 
  their 
  joint 
  work 
  ' 
  On 
  the 
  Silurian 
  Eossils 
  of 
  the 
  Girvan 
  Dis- 
  

   trict 
  of 
  Ayrshire 
  ' 
  t, 
  and 
  by 
  Prof. 
  Nicholson 
  in 
  his 
  ' 
  Palaeontology,' 
  

   are 
  likewise 
  unsuitable 
  for 
  the 
  admission 
  of 
  the 
  species 
  enume- 
  

   rated 
  below. 
  

  

  12. 
  PSAMMOSIPHON 
  ELONGATUS, 
  Sp 
  n0V. 
  

  

  Tube 
  elongate, 
  serial 
  or 
  biserial, 
  varying 
  in 
  length 
  from 
  ~^ 
  to 
  ~^- 
  

   * 
  This 
  name 
  is 
  substituted 
  for 
  Arenafubulite*. 
  t 
  Fasciculus 
  iii. 
  pp. 
  303-318. 
  

  

  