﻿OF 
  THE 
  WEDLOCK 
  SHALES. 
  381 
  

  

  like 
  spines, 
  and 
  these 
  are 
  developed 
  apparently 
  from 
  an 
  outer 
  layer 
  

   of 
  the 
  wall 
  of 
  the 
  tube. 
  Walls 
  partaking 
  of 
  a 
  laminar 
  structure. 
  

  

  I 
  have 
  examined 
  a 
  great 
  number 
  of 
  recent 
  and 
  fossil 
  Annelida, 
  

   but 
  I 
  cannot 
  find 
  in 
  any 
  of 
  the 
  calcareous 
  tubes 
  special 
  charac- 
  

   ters 
  corresponding 
  with 
  those 
  of 
  C. 
  scalariformis. 
  It 
  is 
  therefore 
  to 
  

   be 
  hoped 
  that 
  this 
  crude 
  description 
  will 
  direct 
  towards 
  the 
  Cornu- 
  

   lites 
  of 
  the 
  Silurian 
  epoch 
  the 
  attention 
  of 
  critical 
  palaeontologists 
  

   both 
  at 
  home 
  and 
  abroad. 
  

  

  Genus 
  Coxchicolites, 
  Nicholson/ 
  

  

  ConcJiieolites, 
  Am. 
  Journ. 
  of 
  Science, 
  March 
  1872. 
  Type 
  C. 
  gre- 
  

   garius, 
  Nich. 
  

  

  Conchicolites, 
  Geol. 
  Mag. 
  Feb. 
  1873. 
  Sp. 
  Conchicolites 
  corru- 
  

   gatus.* 
  

  

  This 
  genus 
  was 
  founded 
  by 
  Nicholson, 
  and 
  referred 
  to 
  in 
  full 
  in 
  

   the 
  above 
  papers 
  and 
  in 
  his 
  Palaeontological 
  and 
  Natural 
  History 
  

   Manuals, 
  for 
  species 
  which 
  in 
  all 
  probability 
  would 
  be 
  referred 
  by 
  

   authors 
  to 
  Cornulites, 
  Schlot. 
  The 
  distinction 
  between 
  the 
  two 
  

   genera 
  is 
  something 
  more 
  than 
  merely 
  superficial 
  ; 
  there 
  are 
  struc- 
  

   tural 
  differences 
  which 
  widely 
  separate 
  the 
  two 
  groups, 
  and 
  in 
  this 
  

   paper 
  I 
  have 
  given 
  in 
  my 
  synopsis 
  the 
  leading 
  and 
  typical 
  characters 
  

   of 
  the 
  genera. 
  I 
  have 
  not 
  the 
  material 
  at 
  hand 
  to 
  reexamine 
  Cornu- 
  

   lites, 
  and 
  I 
  have 
  only 
  reproduced 
  the 
  textual 
  outlines 
  of 
  previous 
  

   authors. 
  This 
  is 
  to 
  be 
  regretted 
  : 
  but 
  I 
  was 
  unable 
  to 
  obtain 
  speci- 
  

   mens 
  for 
  a 
  closer 
  examination. 
  I 
  have, 
  however, 
  gone 
  very 
  care- 
  

   fully 
  over 
  the 
  whole 
  of 
  the 
  figures 
  and 
  text 
  of 
  both 
  the 
  ' 
  Siluriau 
  

   System 
  ' 
  and 
  ' 
  Siluria,' 
  and 
  also 
  the 
  details 
  of 
  Prof. 
  M'Coy. 
  In 
  the 
  

   separation 
  of 
  the 
  present 
  genus 
  from 
  Cornulites 
  Prof. 
  Nicholson 
  has 
  

   my 
  warmest 
  appreciation. 
  

  

  2. 
  Conchicolites 
  NiCHOLSONii, 
  n. 
  sp. 
  (PI. 
  XY. 
  fig. 
  2.) 
  

  

  Tube 
  minute, 
  calcareous, 
  varying 
  in 
  length 
  from 
  1 
  to 
  2 
  lines. 
  An- 
  

   nulations 
  very 
  irregular, 
  close 
  or 
  compacted 
  together 
  near 
  the 
  proxi- 
  

   mal 
  end, 
  rather 
  more 
  separated 
  towards 
  the 
  distal 
  end, 
  the 
  average 
  

   number 
  about 
  ten 
  to 
  a 
  line. 
  Proximal 
  end 
  of 
  the 
  tube 
  connected 
  by 
  

   lateral 
  annulations 
  to 
  foreign 
  objects, 
  the 
  remaining 
  portion 
  free. 
  

  

  Log. 
  Eather 
  common 
  in 
  the 
  Buildwas 
  beds, 
  no. 
  22 
  ; 
  rare 
  in 
  the 
  

   other 
  washings. 
  It 
  is 
  also 
  present, 
  but 
  not 
  abundant, 
  in 
  the 
  Tick- 
  

   wood 
  beds, 
  nos. 
  25 
  and 
  42. 
  Above 
  these 
  beds 
  I 
  have 
  not 
  detected 
  it. 
  

  

  This 
  beautiful 
  and 
  delicate 
  Annelid 
  I 
  dedicate 
  to 
  Prof. 
  Nicholson, 
  

   on 
  account 
  of 
  the 
  very 
  valuable 
  labour 
  which 
  he 
  has 
  bestowed 
  upon 
  

   this 
  genus. 
  The 
  species 
  is 
  a 
  variable 
  one, 
  especially 
  in 
  the 
  upper 
  

   beds, 
  but 
  more 
  in 
  its 
  manner 
  of 
  attachment 
  than 
  in 
  the 
  delicacy 
  

   of 
  its 
  annulations. 
  Beginning 
  as 
  a 
  mere 
  point, 
  the 
  tube 
  assumes 
  

   its 
  normal 
  character 
  very 
  early. 
  For 
  about 
  -^ 
  of 
  an 
  inch 
  the 
  

   rings 
  are 
  very 
  fine, 
  and 
  these 
  are 
  produced 
  laterally, 
  as 
  the 
  mode 
  

  

  * 
  In 
  this 
  paper 
  and 
  description 
  of 
  figures 
  the 
  student 
  must 
  reverse 
  the 
  

   figures 
  in 
  text, 
  &c. 
  : 
  — 
  Figs. 
  2, 
  '2a. 
  Ortonia 
  minor 
  ; 
  figs. 
  3, 
  3a. 
  Conchicolites 
  

   corrugatus. 
  

  

  