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  TWEXTY-EIGHTH 
  REEOET 
  OX 
  THE 
  STATE 
  MUSEUM. 
  

  

  CORNULITES 
  Schloiheim. 
  

  

  Coxchicolites 
  Nicholson. 
  

   Opt 
  ox 
  i 
  a 
  Nicholson. 
  

  

  CORXTTLITES 
  PEOPRIUS. 
  

   Plate 
  31, 
  Figs. 
  1-13. 
  

  

  Cor 
  indites 
  proprius 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Xat. 
  Hist. 
  Explanation 
  

   of 
  pi. 
  31, 
  figs. 
  1-13. 
  1876. 
  

  

  Elongate-tubular, 
  obconical 
  or 
  trumpet-shaped 
  bodies, 
  rap- 
  

   idly 
  enlarging 
  toward 
  the 
  aperture 
  which 
  is 
  campanulate 
  with 
  

   the 
  margins 
  always 
  imperfect. 
  Surface 
  in 
  the 
  young 
  usually 
  

   sharply 
  annulated 
  and 
  longitudinally 
  striated; 
  the 
  section 
  

   subcircular, 
  a 
  little 
  flattened 
  on 
  the 
  adhering 
  side. 
  

  

  These 
  bodies 
  in 
  their 
  young 
  state 
  are 
  parasitic 
  (adhering 
  to 
  

   other 
  organic 
  bodies), 
  occurring 
  as 
  slender 
  tubes 
  which 
  are 
  

   more 
  or 
  less 
  curved 
  or 
  undulating, 
  and 
  rarely 
  straight 
  for 
  a 
  

   considerable 
  portion 
  of 
  their 
  length 
  ; 
  the 
  apices, 
  when 
  entire, 
  

   are 
  abruptly 
  curved, 
  often 
  making 
  half 
  a 
  volution 
  or 
  more 
  ; 
  

   growing 
  singly 
  or 
  in 
  groups 
  of 
  two 
  or 
  more 
  (as 
  shown 
  in 
  fig- 
  

   ures 
  1-3, 
  pi. 
  31,) 
  and 
  conforming 
  to 
  the 
  contour 
  of 
  the 
  surface 
  

   to 
  which 
  they 
  are 
  attached 
  for 
  a 
  varying 
  distance 
  of 
  10 
  to 
  20 
  

   mm. 
  or 
  more, 
  and 
  then 
  becoming 
  free, 
  either 
  by 
  extending 
  in 
  

   a 
  direct 
  line 
  and 
  rising 
  above 
  the 
  surface, 
  or 
  growing 
  beyond 
  

   the 
  limits 
  of 
  the 
  object 
  to 
  which 
  the 
  germ 
  was 
  attached, 
  and 
  

   continuing 
  their 
  growth 
  ; 
  or 
  becoming 
  separated, 
  leave 
  the 
  

   adhering 
  basal 
  portion, 
  which 
  is 
  always 
  imperfect 
  or 
  broken 
  

   at 
  the 
  margins 
  of 
  the 
  open 
  extremity. 
  

  

  This 
  is 
  the 
  prevailing, 
  and 
  almost 
  universal 
  condition 
  of 
  

   these 
  bodies 
  in 
  their 
  earlier 
  stages 
  of 
  growth. 
  The 
  minute 
  

   apex 
  finally 
  becomes 
  solid, 
  is 
  absorbed, 
  or 
  otherwise 
  dis- 
  

   appears 
  ; 
  the 
  remaining 
  tubular 
  portion 
  gradually 
  loses 
  its 
  

   evenly 
  annulated 
  character 
  in 
  the 
  progress 
  of 
  growth, 
  the 
  

   substance 
  of 
  the 
  tube 
  becomes 
  thickened, 
  the 
  rings 
  broader, 
  

   less 
  defined 
  or 
  obsolescent, 
  merging 
  into 
  a 
  generally 
  undulat- 
  

   ing 
  or 
  subimbricating 
  surface, 
  which 
  is 
  marked 
  by 
  numerous 
  

   thin 
  irregular 
  annulating 
  ridges, 
  sharply 
  crenulated 
  by 
  the 
  

   longitudinal 
  striae. 
  In 
  this 
  condition 
  the 
  lower 
  or 
  early 
  por- 
  

   tions 
  of 
  the 
  fossil 
  are 
  rarely 
  preserved, 
  the 
  lower 
  extremity 
  

   being 
  usually 
  broken 
  or 
  sometimes 
  cicatrized, 
  having 
  become 
  

   free 
  from 
  the 
  original 
  attachment 
  and 
  continuing 
  as 
  an 
  inde- 
  

   pendent 
  body 
  in 
  the 
  form 
  of 
  a 
  straight, 
  trumpet- 
  shaped 
  tube. 
  

   Many 
  of 
  them, 
  however, 
  still 
  adhere 
  to 
  the 
  original 
  surface 
  

  

  

  