﻿In. 
  

  

  Lin, 
  

  

  5 
  

  

  8 
  

  

  6 
  

  

  

  2 
  

  

  11 
  

  

  2 
  

  

  5 
  

  

  2 
  

  

  °2 
  

  

  1 
  

  

  6" 
  

  

  108 
  THE 
  EXTINCT 
  BATEACHIA, 
  KEPTILIA 
  

  

  Length 
  in 
  the 
  axis, 
  

  

  " 
  laterally 
  " 
  

   Transverse 
  diameter 
  of 
  proximal 
  end, 
  

   Vertical 
  I' 
  " 
  " 
  

  

  Transverse 
  diameter 
  of 
  distal 
  end 
  inferiorly, 
  

   Vertical 
  diameter 
  at 
  middle 
  of 
  trochlea, 
  

  

  The 
  phalanges 
  and 
  tihia 
  figured 
  by 
  Leidy 
  in 
  Cretaceous 
  Reptiles, 
  tab. 
  xvii., 
  8-11, 
  differ 
  from 
  those 
  from 
  Barnes- 
  

  

  boro, 
  and, 
  I 
  suspect, 
  belong 
  to 
  another 
  species. 
  Indeed 
  these 
  portions 
  are 
  so 
  uncharacteristic 
  in 
  Reptiles 
  that 
  they 
  

  

  cannot 
  be 
  certainly 
  assigned 
  to 
  the 
  genus 
  Laelaps. 
  

  

  i 
  

   Whole 
  Hind 
  Limb. 
  — 
  The 
  femur 
  and 
  tibia 
  together 
  measure 
  65.50 
  inches. 
  A 
  method 
  of 
  estimating 
  the 
  

  

  length 
  of 
  the 
  metatarsus 
  is 
  by 
  comparison 
  with 
  that 
  of 
  Hylaeosaurus, 
  as 
  described 
  by 
  Prof. 
  Owen. 
  The 
  distal 
  

  

  extremity 
  of 
  the 
  inner 
  metatarsus 
  in 
  L. 
  macropus 
  (fig. 
  13) 
  is 
  much 
  like 
  the 
  same 
  in 
  Hylaeosaurus, 
  while 
  the 
  proximal 
  

  

  of 
  the 
  outer 
  is 
  like 
  that 
  of 
  Megalosaurus 
  as 
  figured 
  by 
  Owen, 
  so 
  that 
  I 
  estimate 
  their 
  length 
  together 
  to 
  have 
  been 
  ten 
  

  

  inches. 
  The 
  transverse 
  extent 
  of 
  the 
  tibia 
  in 
  the 
  same 
  species 
  is 
  four 
  inches. 
  The 
  latter 
  measurement 
  in 
  L. 
  aquil- 
  

  

  unquis 
  being 
  seven 
  inches, 
  it 
  gives 
  as 
  the 
  whole 
  length 
  of 
  the 
  metatarsus 
  eighteen 
  inches. 
  

  

  The 
  length 
  of 
  the 
  tarsal 
  region 
  may 
  have 
  been 
  five 
  inches. 
  

  

  The 
  longest 
  digit 
  most 
  probably 
  embraced 
  as 
  in 
  the 
  crocodile, 
  four 
  phalanges. 
  None 
  of 
  the 
  eight 
  phalanges 
  of 
  

   the 
  genus 
  which 
  have 
  been 
  preserved 
  are 
  of 
  shortened 
  form 
  like 
  the 
  penultimates 
  in 
  the 
  Palapteryx 
  etc., 
  but 
  though 
  

   from 
  different 
  portions 
  of 
  the 
  toes 
  are 
  all 
  well 
  represented 
  by 
  those 
  of 
  the 
  crocodile. 
  I 
  am 
  disposed 
  therefore 
  to 
  be- 
  

   lieve 
  that 
  the 
  toes 
  were 
  long, 
  and 
  to 
  attribute 
  to 
  the 
  longest 
  a 
  length 
  of 
  twenty-one 
  inches, 
  measuring 
  the 
  chord 
  of 
  

   the 
  ungual 
  phalange. 
  

  

  These 
  measurements 
  give 
  for 
  the 
  total 
  length 
  of 
  the 
  extended 
  hind 
  limb, 
  ten 
  inches 
  more 
  than 
  eight 
  feet. 
  This 
  

   is 
  probably 
  greater 
  in 
  comparison 
  with 
  the 
  total 
  length 
  than 
  in 
  Hadrosaurus, 
  where 
  the 
  elements 
  beyond 
  the 
  tibia 
  

   are 
  comparatively 
  short. 
  The 
  length 
  of 
  the 
  hind 
  limb 
  in 
  Hadrosaurus 
  foulkii 
  was 
  probably 
  a 
  little 
  over 
  nine 
  feet. 
  

  

  Pubes. 
  — 
  Each 
  pubis 
  has 
  a 
  gentle 
  sigmoid 
  flexure 
  and 
  a 
  subtrigonal 
  section. 
  They 
  are 
  flattened 
  at 
  the 
  inner 
  

   extremity, 
  and 
  dilated, 
  with 
  a 
  margin 
  at 
  right 
  angles 
  to 
  the 
  shaft 
  ; 
  the 
  whole 
  of 
  this 
  extremity 
  is 
  not 
  preserved. 
  It 
  

   is 
  hollow, 
  while 
  the 
  shaft 
  is 
  dense 
  and 
  heavy. 
  Length 
  18.5 
  inches. 
  I 
  am 
  disposed 
  to 
  regard 
  these 
  slender 
  bones 
  as 
  

   pubes 
  also, 
  because 
  they 
  are 
  homologous 
  with 
  similar 
  bones 
  in 
  Hadrosaurus, 
  whose 
  ischia 
  we 
  are 
  probably 
  in 
  posses- 
  

   sion 
  of, 
  which 
  are 
  quite 
  different. 
  Moreover 
  the 
  pubes 
  of 
  Hadrosaurus 
  would 
  not 
  support 
  the 
  animal's 
  weight 
  as 
  

   ischia, 
  nor 
  would 
  they 
  permit 
  any 
  lateral 
  motion 
  of 
  the 
  caudal 
  column. 
  The 
  tail 
  of 
  Laelaps 
  probably 
  possessed 
  such 
  

   a 
  motion, 
  and 
  if 
  the 
  ilium 
  be 
  similar 
  to 
  that 
  assigned 
  to 
  Megalosaurus 
  by 
  Huxley, 
  the 
  long 
  pubes 
  if 
  placed 
  in 
  the 
  

   position 
  of 
  ischia 
  would 
  interfere 
  with 
  such 
  motion. 
  

  

  The 
  elongate 
  ischia 
  of 
  Stenopelix 
  are 
  not 
  dissimilar 
  to 
  those 
  of 
  Laelaps, 
  but 
  in 
  the 
  more 
  nearly 
  allied 
  Compsogna- 
  

   thus 
  the 
  pubes 
  are 
  the 
  more 
  elongate. 
  

  

  ? 
  Ilium. 
  — 
  Huxley's 
  statement 
  that 
  the 
  so-called 
  coracoid 
  of 
  Megalosaurus 
  is 
  the 
  ilium, 
  leads 
  us 
  to 
  anticipate 
  a 
  

   similar 
  form 
  for 
  that 
  of 
  Laelaps. 
  In 
  Megalosaurus 
  it 
  is 
  a 
  semidiscoid 
  plate, 
  the 
  superior 
  margin 
  forming 
  an 
  arc, 
  the 
  

   inferior 
  furnishing 
  the 
  acetabular 
  and 
  articular 
  surfaces. 
  It 
  has 
  not 
  the 
  elongation 
  of 
  that 
  of 
  the 
  Ortkopoda, 
  but 
  is 
  

   thinner 
  and 
  lighter. 
  

  

  ? 
  Sternum. 
  — 
  Very 
  broad, 
  thin, 
  plate 
  like 
  bones 
  have 
  been 
  on 
  three 
  occasions 
  found 
  with 
  Gkmiopod 
  Dinosauria. 
  

   One 
  of 
  these 
  was 
  found 
  with 
  the 
  New 
  Jersey, 
  the 
  other 
  with 
  the 
  Mississippi 
  Laelaps. 
  The 
  Mississippi 
  specimen 
  is 
  

   13.5 
  inches 
  long, 
  and 
  presents 
  a 
  thickened 
  margin 
  with 
  convex 
  outline 
  on 
  one 
  side, 
  and 
  thins 
  away 
  to 
  a 
  thin 
  edge 
  at 
  

   a 
  width 
  of 
  4 
  in. 
  5 
  lin. 
  One 
  side 
  of 
  this 
  plate 
  is 
  convex, 
  the 
  other 
  concave, 
  and 
  the 
  ossification 
  radiates 
  from 
  the 
  mid- 
  

   dle 
  of 
  the 
  thickened 
  margin 
  in 
  every 
  direction. 
  There 
  are 
  no 
  traces 
  of 
  contact 
  with 
  diapophyses 
  of 
  a 
  sacrum. 
  The 
  

   New 
  Jersey 
  specimen, 
  found 
  with 
  the 
  other 
  remains 
  of 
  Laelaps 
  aquihmquis, 
  is 
  merely 
  a 
  piece 
  broken 
  from 
  the 
  thick- 
  

   ened 
  margin 
  of 
  a 
  similar, 
  though 
  smaller 
  bone 
  measuring 
  some 
  4.5 
  in 
  length 
  and 
  1.75 
  in 
  width. 
  

  

  The 
  form 
  of 
  these 
  pieces 
  reminds 
  one 
  of 
  the 
  thin 
  concave 
  anterior 
  expansion 
  of 
  the 
  ilium 
  in 
  gallinaceous 
  and 
  

   other 
  birds, 
  or 
  if 
  sternal, 
  of 
  the 
  xiphisternal 
  element. 
  

  

  