﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  107 
  

  

  The 
  direction 
  of 
  the 
  condyle 
  in 
  these 
  genera 
  indicates 
  the 
  articulation 
  of 
  the 
  distal 
  tarsal 
  and 
  metatarsal 
  elements 
  

   to 
  have 
  been 
  at 
  a 
  considerable 
  angle 
  with 
  the 
  shank 
  of 
  the 
  leg, 
  and 
  that 
  the 
  direction 
  of 
  the 
  whole 
  foot 
  was 
  oblique 
  

   as 
  in 
  the 
  birds. 
  As 
  the 
  type 
  is 
  in 
  respect 
  to 
  this 
  articulation 
  between 
  that 
  of 
  Iguanodon 
  and 
  that 
  of 
  Compsognathus, 
  

   we 
  may 
  probably 
  attribute 
  to 
  it 
  a 
  length 
  of 
  metatarsus 
  intermediate 
  between 
  those 
  possessed 
  by 
  these 
  two, 
  a 
  proposi- 
  

   tion 
  confirmed 
  by 
  the 
  metatarsals 
  of 
  an 
  allied 
  species, 
  L. 
  macropus 
  m, 
  preserved 
  in 
  the 
  Museum 
  of 
  Rutger's 
  College, 
  

   New 
  Brunswick, 
  and 
  described 
  by 
  Leidy. 
  These 
  are 
  double 
  the 
  length 
  of 
  the 
  slender 
  phalanges 
  and 
  near 
  one-half 
  

   that 
  of 
  the 
  tibia, 
  slender 
  and 
  pneumatic. 
  

  

  Among 
  the 
  remaining 
  Dinosauria 
  the 
  two 
  rows 
  of 
  tarsals 
  are 
  distinct 
  and 
  composed 
  of 
  several 
  elements 
  ; 
  one 
  of 
  

   the 
  proximal 
  series 
  articulating 
  with 
  the 
  largely 
  developed 
  fibula 
  as 
  in 
  the 
  Sauria 
  proper. 
  For 
  this 
  I 
  have 
  proposed 
  

   the 
  name 
  Orthopoda 
  as 
  the 
  tarsal 
  and 
  metatarsal 
  elements 
  do 
  not 
  seem 
  to 
  have 
  been 
  capable 
  of 
  the 
  same 
  degree 
  of 
  

   flexure 
  on 
  each 
  other 
  as 
  in 
  the 
  Goniopoda 
  and 
  Symphypoda. 
  

  

  Phalanges. 
  — 
  No. 
  1. 
  An 
  ungual 
  phalange 
  of 
  remarkable 
  size 
  and 
  destructive 
  use. 
  The 
  depth 
  at 
  the 
  proximal 
  

   articulation 
  is 
  about 
  the 
  same 
  as 
  in 
  Megalosaurus 
  bucklandii 
  (two 
  inches 
  without 
  inferior 
  tuberosity), 
  but 
  the 
  

   length 
  is 
  considerably 
  greater. 
  Form 
  everywhere 
  compressed, 
  especially 
  at 
  tip; 
  rounded 
  above. 
  Below 
  the 
  articu- 
  

   lating 
  surfaces 
  is 
  the 
  point 
  of 
  insertion 
  of 
  a 
  large 
  flexor 
  tendon, 
  a 
  flattened 
  subglobular 
  process, 
  separated 
  by 
  a 
  groove 
  

   except 
  in 
  front. 
  The 
  groove 
  extends 
  on 
  each 
  side 
  distally 
  on 
  the 
  middle, 
  to 
  the 
  tip. 
  The 
  general 
  form 
  is 
  not 
  unlike 
  

   that 
  of 
  a 
  rapacious 
  bird, 
  but 
  it 
  is 
  more 
  compressed. 
  

  

  Inches. 
  

   Length 
  on 
  convexity, 
  9jj- 
  

  

  Chord 
  from 
  articulatory 
  surface, 
  6 
  J 
  

  

  Surface 
  slightly 
  striated 
  at 
  the 
  base 
  on 
  one 
  side. 
  

  

  No. 
  2. 
  Penultimate. 
  Proximally 
  higher 
  than 
  broad, 
  distally 
  broader 
  than 
  high 
  ; 
  two 
  elevated 
  articular 
  surfaces 
  

   proximally, 
  distal 
  condyles 
  separated 
  by 
  a 
  deep 
  groove 
  and 
  much 
  prolonged 
  inferiority 
  ; 
  a 
  fossa 
  on 
  each 
  side 
  eccentric 
  

   to 
  the 
  condyle. 
  Superior 
  outline 
  straight, 
  inferior 
  descending 
  behind. 
  

  

  No. 
  3. 
  Also 
  penultimate, 
  is 
  flatter 
  and 
  moi 
  - 
  e 
  parallelogrammic 
  in 
  section 
  than 
  the 
  last. 
  

  

  No. 
  4. 
  Antepenult 
  ? 
  more 
  cylindrical, 
  condyles 
  broken. 
  

  

  Inches. 
  

  

  Length, 
  No. 
  2, 
  4.75 
  

  

  Proximal 
  elevation, 
  1.75 
  

  

  " 
  breadth 
  below, 
  1.75 
  

  

  Breadth 
  shank 
  below, 
  1.25 
  

  

  Distal 
  width, 
  1.25 
  ' 
  

  

  " 
  " 
  of 
  condyles 
  below, 
  1.75 
  

  

  No. 
  3, 
  proximal 
  breadth 
  below, 
  2.125 
  

  

  Breadth 
  shank 
  below, 
  1.50 
  

  

  Terminal 
  and 
  inferior 
  breadth 
  distal 
  condyles, 
  1.875 
  

  

  No. 
  4, 
  length, 
  6. 
  

  

  Another 
  phalange 
  of 
  a 
  much 
  larger 
  individual 
  pertaining 
  perhaps 
  to 
  Laelaps, 
  which 
  was 
  accompanied 
  by 
  a 
  plate- 
  

   like 
  bone, 
  is 
  thus 
  described 
  in 
  the 
  Proceedings 
  Academy 
  Natural 
  Sciences, 
  18G6, 
  p. 
  6 
  : 
  

  

  "Dr. 
  Leidy 
  directed 
  the 
  attention 
  of 
  the 
  members 
  to 
  the 
  specimen 
  of 
  a 
  large 
  phalanx 
  of 
  an 
  extinct 
  reptile, 
  pre- 
  

   sented 
  this 
  evening 
  by 
  Dr. 
  W. 
  Spillman 
  of 
  Columbus, 
  Miss. 
  It 
  was 
  derived 
  from 
  the 
  cretaceous 
  formation 
  in 
  the 
  

   vicinity 
  of 
  the 
  latter 
  place, 
  and 
  is 
  remarkably 
  well 
  preserved. 
  It 
  is 
  a 
  first 
  phalanx, 
  and 
  in 
  general 
  form 
  resembles 
  

   the 
  corresponding 
  phalanges 
  of 
  the 
  Alligator, 
  but 
  is 
  proportionately 
  more 
  robust. 
  The 
  proximal 
  articular 
  surface 
  is 
  

   moderately 
  concave, 
  somewhat 
  uneven 
  ; 
  and 
  in 
  outline 
  is 
  transerve 
  oval 
  with 
  the 
  lower 
  side 
  fiat 
  ; 
  the 
  distal 
  extremity 
  

   is 
  provided 
  with 
  a 
  trochlear 
  articular 
  surface 
  and 
  deep 
  pits 
  literally 
  for 
  ligamentous 
  attachment. 
  The 
  animal 
  to 
  

   which 
  the 
  bone 
  belonged 
  is 
  unknown 
  ; 
  it 
  may 
  be 
  conjectured 
  to 
  have 
  appertained 
  to 
  the 
  fore 
  foot 
  of 
  Hadrosaurus. 
  

   The 
  measurements 
  are 
  as 
  follows 
  : 
  

  

  