﻿118 
  

  

  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  Tibia. 
  

  

  Phalange. 
  P. 
  c 
  

  

  7 
  in. 
  

  

  4.75 
  = 
  .07 
  

  

  4 
  in. 
  

  

  3.5 
  = 
  .87 
  

  

  I 
  had 
  already 
  believed 
  to 
  be 
  as 
  herein 
  explained, 
  and 
  as 
  stated 
  by 
  Prof. 
  Huxley, 
  though 
  I 
  had 
  not 
  been 
  able, 
  as 
  he 
  

   has, 
  to 
  place 
  the 
  elements 
  called 
  by 
  Owen 
  clavicles 
  in 
  the 
  position 
  of 
  ischia, 
  but 
  rather 
  of 
  pubes. 
  Prof. 
  Huxley's 
  

   determination 
  of 
  the 
  ilium 
  of 
  Megalosaurus, 
  a 
  point 
  of 
  the 
  greatest 
  importance, 
  was 
  new 
  to 
  me, 
  and 
  I 
  have 
  added 
  

   this 
  and 
  other 
  allusions 
  to 
  his 
  address. 
  Other 
  than 
  these 
  I 
  have 
  added 
  nothing 
  to 
  the 
  history 
  ot 
  Laelaps 
  since 
  its 
  

   original 
  preparation 
  beyond 
  a 
  few 
  points 
  in 
  the 
  restoration 
  which 
  grew 
  only 
  out 
  of 
  my 
  original 
  observations.* 
  

  

  It 
  is 
  not 
  however 
  a 
  matter 
  of 
  surprise, 
  that 
  with 
  the 
  increased 
  number 
  of 
  students 
  at 
  the 
  present 
  time, 
  the 
  same 
  

   subject 
  should 
  be 
  under 
  cotemporary 
  investigation, 
  and 
  the 
  same 
  results 
  be 
  brought 
  out 
  at 
  the 
  same 
  time. 
  

  

  LAELAPS 
  MACROPUS, 
  Cope. 
  

  

  Coelosaurus 
  antiquus, 
  Part, 
  Leidy 
  Cretaceous 
  reptiles, 
  p. 
  119 
  (Fragments 
  of 
  tibia, 
  metatarsal 
  bone 
  and 
  phalanges 
  

   from 
  Monmouth 
  county, 
  N. 
  J 
  ) 
  also 
  p. 
  101. 
  Laelaps 
  aquilunguis, 
  part, 
  Cope, 
  Proc. 
  A. 
  N. 
  Sci., 
  Phil., 
  1866, 
  279. 
  

  

  The 
  remains 
  on 
  which 
  this 
  species 
  is 
  based 
  have 
  been 
  described 
  by 
  Leidy 
  1. 
  c. 
  without 
  distinct 
  determination. 
  

   That 
  it 
  is 
  distinct 
  from 
  the 
  animal 
  called 
  by 
  him 
  Coelosaurus 
  antiquus 
  is 
  very 
  probable 
  from 
  the 
  great 
  difference 
  in 
  

   size 
  (it 
  is 
  double 
  the 
  latter 
  in 
  most 
  measurements), 
  and 
  from 
  the 
  greater 
  expansion 
  of 
  the 
  distal 
  end 
  of 
  the 
  tibia. 
  

   Width 
  head 
  to 
  tibia, 
  3 
  in. 
  to 
  4 
  in.; 
  in 
  Coelosaurus 
  antiquus 
  25 
  lin. 
  to 
  31 
  lin. 
  However, 
  until 
  some 
  additional 
  portions 
  

   of 
  Coelosaurus 
  are 
  discovered, 
  its 
  character 
  will 
  remain 
  unknown, 
  and 
  I 
  prefer 
  to 
  associate 
  the 
  present 
  with 
  Lae- 
  

   laps 
  until 
  this 
  is 
  the 
  case. 
  The 
  event 
  may 
  be 
  that 
  it 
  pertains 
  to 
  neither 
  genus. 
  

  

  It 
  differs 
  from 
  Laelaps 
  aquilunguis 
  in 
  its 
  much 
  smaller 
  size 
  (if 
  adult) 
  and 
  in 
  the 
  relatively 
  larger 
  size 
  of 
  its 
  

   phalanges, 
  and 
  consequently 
  larger 
  feet. 
  Compare 
  the 
  transverse 
  width 
  of 
  the 
  distal 
  end 
  of 
  the 
  tibia 
  and 
  length 
  of 
  

   a 
  penultimate 
  phalange 
  in 
  each. 
  

  

  Laelaps 
  aquilunguis, 
  

   Laelaps 
  macropus, 
  

  

  The 
  proximal 
  phalanges 
  differ 
  also 
  in 
  their 
  greater 
  depth 
  proximally, 
  and 
  in 
  that 
  their 
  

   inferior 
  tubercle 
  is 
  expanded 
  throughout 
  the 
  whole 
  width 
  of 
  that 
  extremity. 
  The 
  head 
  

   of 
  the 
  tibia 
  bears 
  on 
  its 
  exterior 
  outline 
  a 
  tuberosity 
  not 
  seen 
  in 
  L. 
  aquilunguis 
  (a 
  in 
  the 
  

   outline, 
  fig. 
  31). 
  

  

  Fig. 
  31. 
  

  

  A 
  fragment 
  of 
  metatarsal 
  is 
  described 
  by 
  Leidy, 
  

   and 
  the 
  distal 
  extremity 
  figured. 
  It 
  appears 
  to 
  have 
  

   been 
  the 
  external 
  one, 
  and 
  its 
  condyle 
  is 
  directed 
  

   slightly 
  outwards. 
  It 
  is 
  flattened 
  on 
  the 
  inner 
  

   face, 
  indicating 
  close 
  contact 
  with 
  its 
  fellow. 
  The 
  

   proximal 
  portion 
  of 
  another 
  appears 
  to 
  be 
  the 
  ex- 
  

   ternal 
  of 
  the 
  other 
  side. 
  It 
  is 
  also 
  flattened 
  on 
  the 
  

   inner 
  face, 
  by 
  an 
  oblique 
  plane 
  which 
  looks 
  up- 
  

   wards 
  and 
  inwards, 
  and 
  which 
  narrows 
  distally. 
  

   Proximally 
  it 
  widens 
  as 
  the 
  face 
  of 
  a 
  transverse 
  

   dilatation 
  of 
  the 
  extremity, 
  which 
  gives 
  the 
  artic- 
  

   ular 
  end 
  a 
  V 
  shape. 
  See 
  fig. 
  32a 
  (nat. 
  size). 
  To 
  

   this 
  is 
  added 
  a 
  infero-superior 
  view 
  of 
  the 
  same 
  

   extremity 
  one-half 
  nat. 
  size, 
  and 
  fig. 
  33, 
  an 
  extero- 
  

   postcrior, 
  and 
  fig. 
  34 
  an 
  extero-anterior 
  view 
  of 
  the 
  distal 
  extremity 
  of 
  the 
  other. 
  

  

  * 
  Sec 
  Hays' 
  Moillcal 
  Journal, 
  l'Mlada., 
  March, 
  1868. 
  

  

  