﻿378 
  G. 
  B. 
  VINE 
  OX 
  TEE 
  ANNELIDA 
  TUBICOLA 
  

  

  Some 
  of 
  these 
  species, 
  with 
  the 
  addition 
  of 
  others, 
  ranged 
  into 
  the 
  

   Lower 
  and 
  Upper 
  Ludlow, 
  interesting 
  particulars 
  of 
  which 
  are 
  given 
  

   in 
  the 
  Presidential 
  Address 
  to 
  the 
  Geological 
  Society 
  in 
  1881 
  by 
  

   Mr. 
  Eobert 
  Etheridge, 
  F.K.S. 
  

  

  I 
  have 
  been 
  allowed 
  to 
  examine 
  the 
  typical 
  specimens 
  of 
  Ortonia 
  

   and 
  Ooncldcolites 
  which 
  Prof. 
  Nicholson 
  has 
  described 
  in 
  his 
  various 
  

   writings, 
  and 
  also 
  the 
  Tentaculites 
  minutus 
  of 
  Mr. 
  James's 
  MS. 
  I 
  

   cannot 
  but 
  accept 
  the 
  two 
  genera 
  of 
  Nicholson 
  ; 
  but 
  the 
  specific 
  

   characters 
  of 
  the 
  American 
  are 
  not 
  wholly 
  applicable 
  to 
  British 
  

   specimens. 
  I 
  am 
  therefore 
  compelled 
  to 
  describe 
  them 
  as 
  new. 
  

   In 
  dealing 
  with 
  this 
  group 
  I 
  have 
  endeavoured 
  to 
  represent 
  as 
  fairly 
  

   as 
  possible 
  the 
  views 
  of 
  other 
  authors; 
  yet 
  the 
  very 
  poor 
  details 
  

   furnished 
  by 
  them 
  give 
  small 
  help 
  in 
  the 
  way 
  of 
  original 
  research. 
  

   Nearly 
  all 
  the 
  species 
  are 
  described 
  superficially, 
  and 
  but 
  little 
  evi- 
  

   dence 
  of 
  structure 
  is 
  afforded. 
  Some 
  of 
  the 
  figures 
  in 
  Murchison's 
  

   ' 
  Siluria 
  ' 
  and 
  in 
  the 
  ' 
  Silurian 
  System 
  ' 
  are 
  represented 
  as 
  having 
  

   been 
  polished, 
  and 
  so 
  the 
  peculiar 
  characters 
  of 
  the 
  walls 
  of 
  the 
  tube 
  

   are 
  shown. 
  The 
  striation, 
  too, 
  of 
  the 
  smaller 
  specimens 
  of 
  Cornulites 
  

   can 
  be 
  examined, 
  so 
  as 
  to 
  obtain 
  evidence 
  of 
  superficial 
  structure 
  : 
  

   but 
  as 
  some 
  of 
  the 
  examples 
  * 
  in 
  the 
  ' 
  Siluria 
  ' 
  are 
  represented 
  as 
  

   being 
  wholly 
  attached 
  to 
  some 
  foreign 
  object/and 
  as 
  one 
  of 
  the 
  cha- 
  

   racters 
  of 
  the 
  genus 
  Cornulites 
  is 
  that 
  it 
  is 
  " 
  attached 
  by 
  its 
  smaller 
  

   extremity 
  to 
  some 
  foreign 
  body," 
  the 
  species 
  thus 
  figured 
  must 
  of 
  

   necessity 
  be 
  placed 
  in 
  another 
  genus. 
  I 
  shall 
  therefore 
  arrange 
  the 
  

   described 
  genera 
  of 
  Tubicolar 
  Annelida 
  of 
  the 
  Palaeozoic 
  formations 
  

   as 
  follows 
  : 
  — 
  

  

  I. 
  Cornulites, 
  Schlotheim, 
  Petrefactcu, 
  1820. 
  

  

  Tube 
  annulated, 
  striated 
  longitudinally, 
  attached 
  by 
  some 
  por- 
  

   tion 
  of 
  its 
  extremity 
  to 
  foreign 
  bodies. 
  

  

  TT. 
  Conchicolites, 
  Nicholson, 
  Geological 
  Magazine, 
  Eeb. 
  1873. 
  

  

  Tube 
  annulated, 
  devoid 
  of 
  longitudinal 
  striae, 
  slightly 
  curved, 
  

   attached 
  by 
  its 
  smaller 
  extremity 
  to 
  foreign 
  bodies. 
  

  

  III. 
  Ortonia, 
  Nicholson, 
  Geological 
  Magazine, 
  October 
  1872. 
  

  

  Tube 
  annulated 
  ; 
  cellular 
  or 
  not 
  along 
  the 
  surface 
  opposite 
  to 
  

   its 
  attached 
  portion 
  ; 
  slightly 
  flexuous 
  and 
  attached 
  along 
  

   the 
  whole 
  of 
  one 
  side 
  to 
  some 
  foreign 
  body. 
  

  

  IV. 
  Spirorbis, 
  Lamarck. 
  

  

  Tube 
  spirally 
  twisted 
  into 
  an 
  orbicular 
  form, 
  depressed, 
  and 
  

   adhering 
  below. 
  The 
  spiral 
  may 
  bo 
  either 
  right-handed 
  

   (deoctral) 
  or 
  left-handed 
  (sinistral). 
  

  

  V. 
  Tentaculites, 
  Schlotheim, 
  Petrefacten, 
  i. 
  p. 
  377 
  (1820). 
  

  

  Tube 
  annulated; 
  devoid 
  of 
  longitudinal 
  striae 
  or 
  of 
  cellular 
  

   structure 
  ; 
  conical, 
  straight, 
  tapering 
  towards 
  one 
  extre- 
  

   mity, 
  and 
  wholly 
  unattached 
  to 
  any 
  foreign 
  body. 
  

  

  * 
  Plate 
  xyi. 
  'Siluria/ 
  eel. 
  1859. 
  

  

  