﻿

  In. 
  

  

  Lin. 
  

  

  

  Length 
  (not 
  restored, 
  ) 
  

  

  7 
  

  

  11 
  

  

  Diameter 
  median. 
  

  

  Diameter 
  proximal, 
  

  

  1 
  

  

  10 
  

  

  " 
  distal, 
  

  

  AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  231 
  

  

  Lin. 
  

   14 
  

   26 
  

   Portions 
  of 
  shafts, 
  etc. 
  of 
  most 
  of 
  the 
  other 
  long 
  bones 
  are 
  preserved. 
  

  

  Both 
  ilia 
  remain, 
  one 
  quite 
  perfect. 
  The 
  latter 
  is 
  more 
  prolonged 
  posteriorly 
  than 
  in 
  Cuvier's 
  figure 
  of 
  that 
  

   hone 
  in 
  Crocodilus 
  biporcatus. 
  The 
  anterior 
  half 
  is 
  much 
  like 
  that 
  in 
  a 
  large 
  smooth 
  toothed 
  Holops 
  from 
  Tinton 
  Falls, 
  

   N. 
  J., 
  but 
  presents 
  a 
  pit 
  just 
  behind 
  the 
  anterior 
  tuberosity 
  not 
  found 
  in 
  it. 
  There 
  is 
  a 
  separate 
  oval 
  articular 
  face 
  

   below 
  this 
  tuberosity 
  at 
  the 
  usual 
  pubic 
  articulation. 
  The 
  anterior 
  angle 
  of 
  the 
  crest 
  of 
  the 
  ilium 
  is 
  not 
  prominent 
  ; 
  

   more 
  so 
  in 
  the 
  Holops 
  above 
  noted. 
  Crest 
  longitudinally 
  rugose. 
  

  

  In. 
  Lin. 
  Lin. 
  

  

  Length 
  ilium, 
  6 
  7 
  Depth 
  anterior 
  tuberosity, 
  22.4 
  

  

  Depth 
  behind 
  ischiadic 
  suture, 
  2 
  3 
  Length 
  posterior 
  hook 
  ilium, 
  32.2 
  

  

  Depth 
  at 
  do 
  3 
  5.7 
  

  

  The 
  dermal 
  hones 
  are 
  very 
  characteristic 
  and 
  distinguish 
  the 
  genus. 
  They 
  differ 
  in 
  two 
  points 
  from 
  those 
  of 
  Tho- 
  

   racosaurus 
  and 
  Holops 
  ; 
  first, 
  in 
  having 
  no 
  pits 
  ; 
  second, 
  in 
  having 
  a 
  prominent 
  median 
  keel. 
  They 
  are 
  rather 
  small, 
  

   subquadrate, 
  and 
  with 
  a 
  very 
  thick, 
  always 
  obtuse, 
  and 
  sometimes 
  elevated 
  median 
  carina. 
  The 
  latter 
  has 
  rather 
  the 
  

   form 
  of 
  a 
  knob. 
  Many 
  of 
  the 
  bones 
  consist 
  chiefly 
  of 
  this 
  knob 
  with 
  a 
  small 
  basis. 
  The 
  superior 
  surface 
  is 
  dotted 
  

   with 
  a 
  few 
  punctae 
  and 
  grooves. 
  Length 
  of 
  one 
  of 
  the 
  largest 
  24.1 
  lines 
  ; 
  depth 
  5 
  lines 
  ; 
  width 
  11.5. 
  Those 
  probably 
  

   of 
  the 
  cervical 
  or 
  anterior 
  dorsal 
  region 
  have 
  been 
  described 
  by 
  me 
  under 
  Holops 
  obscurus, 
  p. 
  78. 
  I 
  believe 
  they 
  should 
  

   be 
  referred 
  here, 
  as 
  those 
  from 
  the 
  dorsal 
  region 
  of 
  the 
  present 
  specimen 
  approach 
  them 
  very 
  closely. 
  Those 
  referred 
  

   to 
  the 
  Bottosaurus, 
  p. 
  66, 
  should 
  be 
  assigned 
  elsewhere. 
  

  

  From 
  the 
  upper 
  bed 
  of 
  upper 
  Cretaceous 
  green-sand 
  New 
  Jersey. 
  Discovered 
  by 
  Judson 
  C. 
  Gaskill, 
  to 
  whom 
  I 
  

   am 
  indebted 
  for 
  portions 
  two 
  individuals. 
  

  

  Holops, 
  Cope. 
  

  

  Holops 
  basitruncatus 
  Owen, 
  Crocodilus 
  basitruncatus, 
  Owen, 
  Journ. 
  Geol. 
  Soc. 
  Lond. 
  V., 
  1849, 
  380 
  ; 
  Palaeontology, 
  1860, 
  

   277 
  ; 
  Pictet 
  Traite 
  de 
  Palseontologie, 
  I., 
  1853, 
  482. 
  Bottosaurus 
  liarlani 
  pars 
  Leidy 
  Cretac. 
  Kept. 
  N. 
  Am. 
  Cope 
  

   huj. 
  op. 
  p. 
  66. 
  

   Specimens 
  referred 
  to 
  Bottosaurus 
  by 
  me, 
  after 
  Leidy, 
  with 
  doubt, 
  appears 
  to 
  me 
  now 
  to 
  represent 
  a 
  true 
  Holops. 
  

   The 
  vertebrae 
  and 
  bones 
  described 
  under 
  that 
  head 
  in 
  this 
  work, 
  p.p. 
  66-7, 
  I 
  accordingly 
  refer 
  to 
  the 
  latter 
  genus, 
  

   as 
  well 
  as 
  fragments 
  of 
  cranium 
  with 
  cervical 
  vertebra 
  from 
  the 
  same 
  localities, 
  referred 
  with 
  doubt 
  to 
  Holops 
  obscu- 
  

   rus, 
  and 
  described, 
  p. 
  77, 
  with 
  cuts 
  19, 
  20, 
  of 
  the 
  muzzle. 
  The 
  enamel 
  of 
  the 
  tooth 
  in 
  this 
  species 
  is 
  not 
  fluted. 
  

  

  Holops 
  glyptodon 
  Cope 
  Hujus 
  operis, 
  p. 
  74. 
  

  

  Two 
  additional 
  specimens 
  of 
  this 
  species, 
  one 
  from 
  Barnesboro 
  and 
  one 
  from 
  Mullica 
  Hill, 
  N. 
  J., 
  indicated 
  that 
  this 
  

   species 
  is 
  a 
  Gavial 
  of 
  the 
  genus 
  Holops. 
  The 
  character 
  of 
  the 
  fluted 
  teeth 
  is 
  well 
  marked. 
  The 
  median 
  dorsal 
  ver- 
  

   tebra? 
  are 
  compressed 
  as 
  in 
  H. 
  obscurus, 
  while 
  some 
  of 
  the 
  cervicals 
  display 
  a 
  prominent 
  transverse 
  crest 
  in 
  front 
  

   as 
  in 
  H. 
  basitruncatus, 
  and 
  much 
  more 
  prominent 
  and 
  extended 
  transversely 
  than 
  in 
  II. 
  obscurus 
  ; 
  size 
  similar 
  to 
  H. 
  

   obscurus. 
  It 
  may 
  be 
  observed 
  that 
  seven 
  examples 
  of 
  the 
  latter 
  confirm 
  its 
  characters. 
  

  

  Thecachampsa, 
  Cope. 
  

  

  The 
  form 
  of 
  the 
  cervical 
  vertebras 
  in 
  this 
  genus 
  was 
  left 
  uncertain 
  in 
  Synopsis 
  of 
  genera 
  of 
  Extinct 
  Crocodilia, 
  p. 
  

   62. 
  I 
  am 
  now 
  able 
  to 
  state 
  that 
  they 
  possess 
  the 
  elongate 
  simple 
  hypapophyses 
  of 
  Crocodilus, 
  and 
  are 
  quite 
  different 
  

   from 
  those 
  of 
  Thoracosaurus. 
  The 
  supposed 
  tertiary 
  Crocodile 
  with 
  bifid 
  hypapophyses, 
  mentioned 
  1. 
  c, 
  is 
  from 
  a 
  

   cretaceous 
  bed 
  in 
  the 
  neighborhood 
  of 
  an 
  Eocene 
  outcrop. 
  

  

  