﻿382 
  G. 
  E. 
  VINE 
  ON 
  THE 
  ANNELIDA 
  TUBICOLA 
  

  

  of 
  attachment 
  to 
  foreign 
  objects, 
  either 
  corals 
  or 
  shells. 
  After 
  

   the 
  tube 
  becomes 
  fixed 
  there 
  is 
  a 
  gradual 
  bending 
  outwards, 
  and 
  

   sometimes 
  for 
  more 
  than 
  two 
  thirds 
  of 
  its 
  length 
  it 
  is 
  free. 
  Nearly 
  

   all 
  my 
  specimens 
  are 
  separate 
  in 
  the 
  shales, 
  and 
  I 
  cannot 
  there- 
  

   fore 
  give 
  any 
  information 
  as 
  to 
  whether 
  the 
  species 
  was 
  solitary 
  or 
  

   social. 
  

  

  3. 
  CONCHICOLTTES 
  GEEGAEITJS, 
  Nicholson. 
  

  

  Conchicolites 
  gregarius, 
  Nicholson, 
  Amer. 
  Journ. 
  Sci. 
  March 
  1872 
  : 
  

   Geol. 
  Mag. 
  Feb. 
  1873 
  ; 
  Manual 
  of 
  Palaeontology, 
  &c, 
  

  

  Var. 
  RTJGosr/s, 
  n. 
  var. 
  

  

  Tube 
  calcareous,, 
  varying 
  in 
  length 
  from 
  2 
  to 
  4 
  lines. 
  Annula- 
  

   tions 
  irregular 
  and 
  rugose, 
  sometimes 
  entire 
  or 
  completely 
  surround- 
  

   ing 
  the 
  tube, 
  at 
  other 
  times 
  forming 
  imperfect 
  rings 
  only, 
  about 
  four 
  

   in 
  the 
  space 
  of 
  a 
  line. 
  Diameter 
  of 
  tho 
  tube 
  varying 
  from 
  three 
  

   quarters 
  of 
  a 
  line 
  to 
  a 
  line 
  ; 
  mouth 
  about 
  half 
  a 
  line. 
  Attached 
  by 
  

   some 
  portion 
  of 
  the 
  proximal 
  end 
  of 
  the 
  tube 
  and 
  by 
  lateral 
  annu- 
  

   lations 
  to 
  foreign 
  bodies. 
  

  

  Loc. 
  Kather 
  common 
  in 
  small 
  fragments 
  in 
  the 
  Buildwas 
  beds, 
  

   no. 
  22. 
  Finely 
  preserved 
  in 
  38 
  and 
  40. 
  Very 
  rare 
  in 
  Coalbrook- 
  

   dale 
  beds, 
  no. 
  43. 
  Present 
  but 
  not 
  abundant 
  in 
  Tickwood 
  beds, 
  

   no. 
  25. 
  

  

  There 
  is 
  no 
  possibility 
  when 
  care 
  is 
  exercised 
  of 
  confounding 
  the 
  

   present 
  species 
  with 
  the 
  former. 
  The 
  abundance 
  of 
  the 
  two 
  species 
  

   in 
  the 
  same 
  beds 
  (no. 
  22 
  washing) 
  affords 
  a 
  good 
  opportunity 
  of 
  

   making 
  a 
  comparison 
  between 
  them. 
  I 
  have 
  some 
  specimens 
  of 
  C. 
  

   Nicholsonii 
  nearly 
  the 
  same 
  length 
  as 
  the 
  C. 
  rugosus, 
  and 
  I 
  can 
  find 
  

   that 
  from 
  the 
  beginning 
  and 
  throughout 
  the 
  whole 
  growth 
  of 
  the 
  

   tube 
  the 
  characters 
  of 
  the 
  two 
  species 
  aro 
  clearly 
  defined. 
  I 
  have, 
  

   however, 
  preferred 
  to 
  give 
  this 
  type 
  a 
  varietal 
  rather 
  than 
  a 
  specific 
  

   name. 
  I 
  cannot 
  say 
  positively 
  that 
  this 
  is 
  a 
  form 
  of 
  Nicholson's 
  

   species, 
  but 
  there 
  seems 
  to 
  me 
  a 
  probability 
  of 
  its 
  being 
  so. 
  When 
  

   C. 
  gregarius 
  was 
  described, 
  the 
  author 
  had 
  to 
  depend 
  on 
  either 
  a 
  

   clustered 
  mass 
  attached 
  to 
  a 
  shell 
  of 
  Orthoceras 
  Brongniarti 
  or 
  

   upon 
  casts. 
  Neither 
  of 
  these 
  show 
  any 
  structure 
  ; 
  but 
  tho 
  cast 
  

   figured 
  by 
  Nicholson 
  * 
  is 
  so 
  characteristic 
  of 
  Conchicolites, 
  that 
  I 
  

   feel 
  a 
  pleasure 
  in 
  being 
  able 
  to 
  remove 
  any 
  difficulty 
  that 
  obscures 
  

   the 
  description. 
  Still 
  there 
  is 
  a 
  doubt, 
  and 
  to 
  avoid 
  any 
  confusion 
  

   I 
  have 
  fully 
  described 
  the 
  variety. 
  

  

  There 
  is 
  a 
  remarkable 
  peculiarity 
  about 
  the 
  superior 
  annulations 
  

   of 
  C. 
  rugosus. 
  Whenever 
  the 
  tube 
  is 
  worn 
  and 
  the 
  rotundity 
  of 
  the 
  

   annulations 
  destroyed 
  there 
  appears 
  to 
  be 
  a 
  number 
  of 
  lines 
  only, 
  

   and 
  the 
  space 
  between 
  these 
  filled 
  in 
  with 
  matrix. 
  In 
  normal 
  

   character 
  the 
  rings 
  are 
  like 
  an 
  ordinary 
  wedding-ring, 
  round 
  on 
  

   the 
  outside. 
  If 
  this 
  rounded 
  part 
  be 
  slightly 
  rubbed 
  small 
  cavities 
  

   appear, 
  like 
  pin-holes 
  ; 
  more 
  rubbed, 
  these 
  are 
  widened 
  into 
  lines 
  ; 
  

   deeper 
  still, 
  the 
  apparently 
  solid 
  ring 
  is 
  divided 
  into 
  two 
  lines, 
  and 
  

  

  * 
  Manual 
  of 
  Palaeontology, 
  vol. 
  i. 
  p. 
  312, 
  fig. 
  182 
  (eel. 
  1879). 
  

  

  