﻿100 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  The 
  fibula 
  in 
  latter 
  stages 
  withdraws 
  from 
  this 
  connection, 
  and 
  becomes 
  much 
  shortened 
  

   and 
  reduced 
  .* 
  

  

  The 
  genera 
  which 
  belong 
  to 
  this 
  order 
  are, 
  

  

  Laelaps, 
  Cope 
  ; 
  

  

  Poecilopleurum, 
  Deslongchamps 
  ; 
  

  

  Megalosaurus, 
  Buckland 
  ; 
  

  

  Coelosaurus, 
  Leidy; 
  

   and 
  perhaps, 
  

  

  Bathygnathus, 
  Leidy 
  ; 
  

  

  Aublysodon, 
  Leidy. 
  

  

  LAELArS, 
  Cope. 
  

  

  Proc. 
  Acad. 
  Nat. 
  Sciences, 
  180G, 
  p. 
  275; 
  1. 
  c, 
  p. 
  316; 
  1. 
  c. 
  1867, 
  p. 
  234. 
  American 
  Naturalist, 
  18G7, 
  27. 
  

   Binodon, 
  Leidy, 
  Proc. 
  A. 
  N. 
  Sci., 
  1868, 
  298, 
  not 
  Ibid., 
  1856, 
  and 
  Transac. 
  Am. 
  Phil. 
  Soc, 
  1859. 
  

  

  LAELAPS 
  AQUILUNGUIS, 
  Cope. 
  

   Loc. 
  Cit. 
  Leidy. 
  1. 
  c. 
  1868. 
  

  

  This 
  species 
  was 
  described 
  by 
  the 
  author 
  from 
  a 
  number 
  of 
  bones 
  and 
  fragments 
  derived 
  from 
  the 
  top 
  of 
  tie 
  

   "chocolate" 
  stratum 
  of 
  Cook 
  & 
  Smock's 
  upper 
  bed 
  of 
  the 
  Cretaceous 
  Greensand 
  of 
  New 
  Jei'sey, 
  at 
  a 
  depth 
  of 
  

   about 
  twenty 
  feet 
  below 
  the 
  surface. 
  They 
  were 
  found 
  by 
  the 
  workmen 
  under 
  direction 
  of 
  J. 
  C. 
  Voorhees, 
  Superin- 
  

   tendent 
  of 
  the 
  West 
  Jersey 
  Marl 
  Company's 
  pits, 
  about 
  two 
  miles 
  south 
  of 
  Barnesboro, 
  Gloucester 
  CO., 
  N. 
  J. 
  The 
  

   bones 
  preserved 
  were 
  portions 
  of 
  the 
  under 
  jaw 
  with 
  teeth, 
  portions 
  of 
  the 
  scapular 
  arch, 
  including 
  supposed 
  pubes 
  

   two 
  humeri, 
  left 
  femur, 
  tibia 
  and 
  fibula, 
  with 
  numerous 
  phalanges, 
  lumbar 
  sacral 
  and 
  caudal 
  vertebras, 
  and 
  numerous 
  

   other 
  elements 
  in 
  a 
  fragmentary 
  condition. 
  

  

  The 
  discovery 
  of 
  this 
  animal 
  filled 
  a 
  hiatus 
  in 
  the 
  Cretaceous 
  Fauna, 
  revealing 
  the 
  carnivorous 
  enemy 
  of 
  the 
  

   great 
  Herbivorous 
  Hadrosaurus, 
  as 
  the 
  Aublysodon 
  was 
  related 
  to 
  the 
  Trachodon 
  of 
  the 
  Nebraska 
  beds, 
  and 
  the 
  

   Megalosaurus 
  to 
  the 
  Iguanodon 
  of 
  the 
  European 
  Wealden 
  and 
  Oolite. 
  

  

  In 
  size 
  this 
  creature 
  equalled 
  the 
  Megalosaurus 
  bucklandii, 
  and 
  with 
  it 
  and 
  Aublysodon, 
  constituted 
  the 
  most 
  

   formidable 
  type 
  of 
  rapacious 
  terrestrial 
  vertebrata 
  of 
  which 
  we 
  have 
  any 
  knowledge. 
  In 
  its 
  dentition 
  and 
  huge 
  

   prehensile 
  claws 
  it 
  resembled 
  Megalosaurus. 
  The 
  species 
  is 
  now 
  rediscribed 
  with 
  additional 
  observations 
  and 
  with 
  

   figures. 
  

  

  ? 
  Zygomatic 
  arch. 
  — 
  A 
  portion 
  6.5 
  inches 
  in 
  length 
  is 
  perhaps 
  the 
  malar 
  portion 
  of 
  the 
  arch 
  rather 
  than 
  the 
  

   .squamosal, 
  since 
  near 
  the 
  termination 
  of 
  its 
  inner 
  or 
  concave 
  face 
  it 
  is 
  pierced 
  by 
  a 
  large 
  foramen, 
  similar 
  in 
  position 
  

   to 
  the 
  suborbital 
  foramen. 
  The 
  bone 
  is 
  slender, 
  chiefly 
  strengthened 
  by 
  a 
  strong 
  external, 
  horizontal 
  ridge, 
  which 
  is 
  

   probably 
  the 
  homologue 
  of 
  that 
  noticed 
  by 
  Prof. 
  Owen 
  as 
  dividing 
  the 
  face 
  of 
  the 
  maxillai-y 
  and 
  malar 
  in 
  Scelido- 
  

   saurus. 
  Alone 
  and 
  below 
  this 
  rib, 
  the 
  bone 
  rapidly 
  thins 
  away. 
  There 
  is 
  little 
  curvature, 
  indicating 
  a 
  long 
  slender 
  

   zygoma 
  perhaps 
  as 
  in 
  Compsognathus. 
  The 
  foramen 
  has 
  not 
  been 
  closed 
  above. 
  

  

  Lines. 
  

   Vertical 
  depth 
  inside 
  of 
  front 
  of 
  foramen, 
  18 
  

  

  Horizontal 
  depth 
  zygoma, 
  15 
  

  

  Maxillary 
  bone. 
  — 
  A 
  portion 
  of 
  the 
  right 
  maxillary 
  displays 
  paits 
  of 
  four 
  alveola} 
  : 
  three 
  of 
  these 
  have 
  a 
  flattened 
  

   oval 
  section, 
  while 
  the 
  anterior 
  is 
  round, 
  suggesting 
  the 
  presence 
  of 
  a 
  canine-like 
  tooth. 
  One 
  successional 
  tooth 
  in 
  

   place 
  extends 
  from 
  the 
  bottom 
  of 
  the 
  alveolus 
  to 
  within 
  .75 
  inch 
  of 
  the 
  maxillary 
  border; 
  it 
  stands 
  obliquely 
  in 
  place, 
  

  

  *See 
  Gegenbaur, 
  1. 
  c. 
  

  

  