﻿202 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  skeleton 
  was 
  lying 
  on 
  its 
  left 
  side, 
  but 
  the 
  definition 
  of 
  the 
  skin 
  pat- 
  

   tern 
  of 
  that 
  side 
  had 
  been 
  dulled 
  or 
  wholly 
  destroyed 
  by 
  the 
  presence 
  

   of 
  a 
  considerable 
  amount 
  of 
  vegetal 
  matter 
  on 
  which 
  it 
  lay. 
  The 
  

   bedding 
  plane 
  beneath 
  the 
  skeleton 
  was 
  unusually 
  in-egular, 
  indicat- 
  

   ing 
  that 
  the 
  cross-bedded 
  planes 
  were 
  laid 
  down 
  by 
  currents 
  acting 
  

   from 
  different 
  directions. 
  

  

  The 
  caudal 
  series 
  consists 
  of 
  75 
  vertebrae 
  and 
  appears 
  to 
  be 
  com- 
  

   plete. 
  This 
  information, 
  together 
  with 
  that 
  furnished 
  by 
  Brown,^ 
  

   shows 
  the 
  complete 
  vertebral 
  formula 
  of 
  Corythosaurus 
  to 
  be 
  15 
  cer- 
  

   vicals, 
  19 
  dorsals, 
  8 
  sacrals, 
  and 
  75 
  caudals. 
  It 
  is 
  presumed, 
  how- 
  

   ever, 
  that 
  as 
  in 
  many 
  other 
  reptiles 
  the 
  caudal 
  series 
  will 
  be 
  subject 
  

   to 
  some 
  individual 
  variation 
  in 
  number. 
  The 
  first 
  16 
  caudal 
  verte- 
  

   brae 
  have 
  transverse 
  processes 
  as 
  in 
  the 
  type. 
  The 
  first 
  chevron 
  on 
  

   the 
  tail 
  of 
  Corythosaurus 
  is 
  carried 
  between 
  the 
  fifth 
  and 
  sixth 
  caudal 
  

   vertebrae; 
  thus 
  the 
  total 
  number 
  of 
  caudal 
  vertebrae 
  can 
  be 
  accu- 
  

   rately 
  determined 
  and 
  a 
  close 
  estimate 
  of 
  their 
  combined 
  length 
  can 
  

   be 
  obtained 
  from 
  this 
  specimen 
  which 
  has 
  the 
  first 
  two 
  caudals 
  com- 
  

   pletely 
  hidden 
  by 
  the 
  overlying 
  ihum 
  and 
  a 
  patch 
  of 
  skin 
  impressions. 
  

   Measured 
  along 
  the 
  curve 
  this 
  tail 
  has 
  a 
  complete 
  length 
  of 
  about 
  455 
  

   cm. 
  (14 
  feet 
  11 
  inches). 
  

  

  A 
  complete 
  description 
  of 
  the 
  ossified 
  tendons 
  of 
  Corythosaurus 
  has 
  

   already 
  been 
  given 
  by 
  Brown, 
  and 
  thus 
  it 
  is 
  only 
  necessary 
  to 
  men- 
  

   tion 
  that 
  the 
  present 
  specimen 
  fully 
  corroborates 
  his 
  determination 
  

   that 
  they 
  are 
  disposed 
  in 
  two 
  layers. 
  

  

  Small 
  patches 
  of 
  skin 
  impressions 
  are 
  present 
  on 
  the 
  midsection 
  of 
  

   the 
  tail, 
  on 
  the 
  pelvis, 
  and 
  on 
  the 
  feet. 
  Those 
  pieces 
  of 
  the 
  integu- 
  

   ment 
  best 
  preserved 
  cover 
  the 
  thirty-first 
  to 
  the 
  thirty-fourth 
  caudal 
  

   vertebrae, 
  respectively. 
  The 
  detailed 
  mosaic 
  pattern 
  of 
  the 
  flat, 
  

   polygonal 
  scales 
  is 
  clearly 
  and 
  beautifully 
  shown 
  in 
  plate 
  18. 
  Origi- 
  

   nally 
  the 
  whole 
  midsection 
  of 
  the 
  tail 
  beginning 
  with 
  the 
  sixteenth 
  

   caudal 
  was 
  covered 
  by 
  skin 
  impressions, 
  but 
  most 
  of 
  the 
  center 
  of 
  this 
  

   patch 
  was 
  so 
  friable 
  that 
  it 
  could 
  not 
  be 
  preserved. 
  The 
  outside 
  

   portions, 
  however, 
  outline 
  the 
  original 
  width 
  of 
  the 
  tail 
  at 
  this 
  

   point. 
  The 
  skin 
  on 
  and 
  below 
  the 
  right 
  ilium 
  is 
  composed 
  of 
  scales, 
  

   slightly 
  larger 
  than 
  those 
  of 
  the 
  midcaudal 
  region, 
  but 
  otherwise 
  

   they 
  seem 
  to 
  be 
  indistinguishable. 
  The 
  pattern 
  of 
  the 
  scales 
  on 
  

   the 
  feet 
  is 
  dim 
  and 
  illy 
  defined 
  and 
  adds 
  nothing 
  to 
  oiu- 
  previous 
  

   knowledge. 
  

  

  In 
  the 
  course 
  of 
  preparing 
  this 
  specimen 
  many 
  small 
  detached 
  pieces 
  

   of 
  skin 
  were 
  found 
  in 
  the 
  matrix. 
  Several 
  of 
  these 
  were 
  folded 
  and 
  

   others 
  had 
  been 
  completely 
  reversed. 
  Six 
  species 
  of 
  this 
  genus 
  have 
  

   been 
  named, 
  aU 
  from 
  the 
  Belly 
  River 
  formation 
  of 
  midwestern 
  Canada. 
  

  

  I 
  8 
  Brown, 
  Barnum, 
  Bull. 
  Amer. 
  Mus. 
  Nat. 
  Hist., 
  vol. 
  35, 
  p. 
  710, 
  1916. 
  

  

  