﻿APPENDIX. 
  

  

  Art. 
  XVI. 
  — 
  Restoration 
  of 
  Stegosaurus 
  ; 
  by 
  O. 
  C. 
  Marsh. 
  

   (With 
  Plate 
  IX.) 
  

  

  In 
  tliis 
  Journal, 
  in 
  1877, 
  the 
  writer 
  described 
  a 
  remarkable 
  

   extinct 
  reptile 
  from 
  Colorado, 
  under 
  the 
  name 
  Stegosaurus 
  

   armatus* 
  and 
  later 
  a 
  much 
  more 
  perfect 
  specimen 
  of 
  another 
  

   species, 
  Stegosaurus 
  ungulatus, 
  from 
  essentially 
  the 
  same 
  hori- 
  

   zon, 
  in 
  the 
  Jurassic 
  of 
  Wyoming, 
  f 
  The 
  latter 
  specimen 
  was 
  

   in 
  fine 
  preseryation, 
  and 
  the 
  more 
  important 
  parts 
  of 
  the 
  skull 
  

   and 
  skeleton, 
  and 
  especially 
  of 
  the 
  remarkable 
  dermal 
  armor, 
  

   were 
  secured. 
  Subsequently, 
  more 
  than 
  twenty 
  other 
  speci- 
  

   mens 
  of 
  these 
  and 
  other 
  species 
  were 
  obtained, 
  so 
  that 
  nearly 
  

   every 
  part 
  of 
  the 
  osseous 
  structure 
  thus 
  became 
  known, 
  and 
  

   only 
  portions 
  of 
  the 
  dermal 
  armor 
  were 
  in 
  doubt. 
  A 
  fortunate 
  

   discovery 
  cleared 
  away 
  most 
  of 
  the 
  doubt 
  in 
  regard 
  to 
  one 
  

   species, 
  Stegosaurus 
  ste?iops, 
  as 
  the 
  type 
  specimen 
  had 
  the 
  skull, 
  

   skeleton, 
  and 
  dermal 
  armor 
  together 
  when 
  entombed, 
  and 
  

   almost 
  in 
  the 
  position 
  they 
  were 
  when 
  the 
  animal 
  died. 
  

  

  With 
  this 
  rich 
  material 
  at 
  hand, 
  an 
  attempt 
  has 
  been 
  made 
  

   to 
  give 
  a 
  restoration 
  of 
  one 
  of 
  the 
  group, 
  and 
  the 
  type 
  specimen 
  

   of 
  Stegosaurus 
  ungulatus 
  has 
  been 
  selected 
  as 
  the 
  basis. 
  This 
  

   has 
  been 
  supplemented 
  by 
  a 
  few 
  portions 
  of 
  the 
  skeleton 
  of 
  

   Stegosaurus 
  duplex, 
  apparently 
  a 
  closely 
  allied 
  species 
  from 
  

   nearly 
  the 
  same 
  locality, 
  while 
  some 
  other 
  parts, 
  especially 
  of 
  

   the 
  dermal 
  armor, 
  have 
  been 
  placed 
  in 
  accordance 
  with 
  their 
  

   known 
  position 
  in 
  Stegosaurus 
  stenops. 
  

  

  The 
  result 
  is 
  given 
  in 
  Plate 
  IX, 
  which 
  is 
  believed 
  to 
  repre- 
  

   sent 
  faithfully 
  the 
  main 
  features 
  of 
  this 
  remarkable 
  re 
  p 
  tile, 
  as 
  

   far 
  as 
  the 
  skeleton 
  and 
  principal 
  parts 
  of 
  the 
  dermal 
  armor 
  are 
  

   concerned. 
  This 
  figure, 
  one-thirtieth 
  natural 
  size, 
  is 
  reduced 
  

   from 
  a 
  larger 
  restoration, 
  one-tenth 
  natural 
  size, 
  made 
  for 
  

  

  * 
  This 
  Journal, 
  II 
  r, 
  vol. 
  xiv, 
  p. 
  513, 
  December, 
  1877. 
  

  

  f 
  Ibid., 
  vol. 
  xviii, 
  p. 
  504, 
  December. 
  1879. 
  See 
  also, 
  vol. 
  xix, 
  p. 
  253, 
  March, 
  

   1880; 
  vol. 
  xxi, 
  p. 
  167, 
  February, 
  1881 
  ; 
  and 
  vol. 
  xxxiv, 
  p. 
  413, 
  November, 
  1887. 
  

  

  