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  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  PLATE 
  IX. 
  

  

  Fig. 
  1. 
  Tibia 
  of 
  Laelaps 
  aquilunguis, 
  the 
  inner 
  side. 
  1 
  a, 
  the 
  same, 
  anterior 
  view. 
  Size 
  one-fourth 
  nature. 
  

   1 
  c, 
  distal 
  extremity 
  of 
  the 
  tibia. 
  

  

  Fig. 
  2. 
  Fibula 
  of 
  the 
  same, 
  seen 
  from 
  the 
  tibial 
  or 
  inner 
  face. 
  

  

  Fig. 
  3. 
  Astragalus 
  of 
  the 
  same, 
  anterior 
  view. 
  One-third 
  natural 
  size. 
  3 
  a, 
  external 
  view. 
  3 
  b, 
  inner 
  extremity. 
  

   3 
  c, 
  ascending 
  apophysis. 
  

  

  Fig. 
  4. 
  Distal 
  caudal 
  vertebra 
  of 
  the 
  same. 
  One-half 
  natural 
  size. 
  

  

  PLATE 
  X. 
  

  

  Fig. 
  1. 
  Penultimate 
  phalange 
  of 
  Laelaps 
  aquilunguis, 
  lateral 
  view. 
  Natural 
  size. 
  

  

  Fig. 
  2. 
  Ungueal 
  phalange 
  of 
  the 
  same, 
  lateral 
  view. 
  Natural 
  size. 
  

  

  Fig. 
  3. 
  Humerus 
  of 
  Laelaps 
  aquilinguis, 
  external 
  view. 
  One-half 
  natural 
  size. 
  3 
  a, 
  same, 
  posterior 
  view. 
  

  

  Fig. 
  4. 
  Ischiadic 
  bone 
  of 
  the 
  same, 
  the 
  inner 
  side. 
  One-third 
  natural 
  size. 
  

  

  Fig. 
  5. 
  Fragment 
  of 
  right 
  ramus 
  of 
  the 
  mandible 
  of 
  the 
  same, 
  with 
  functional 
  and 
  successional 
  teeth. 
  One-half 
  

   the 
  natural 
  size. 
  

  

  Fig. 
  6. 
  Crown 
  of 
  a 
  successional 
  tooth 
  of 
  the 
  same 
  jaw 
  (seen 
  in 
  Fig. 
  5 
  behind 
  the 
  second 
  tooth). 
  Natural 
  size. 
  

   (The 
  artist 
  has 
  represented 
  the 
  denticulations 
  finer 
  than 
  in 
  nature.) 
  

  

  Fig. 
  7. 
  Beak 
  of 
  the 
  Eocene 
  fish 
  Coelorliynchus 
  ornatus, 
  Leidy. 
  From 
  near 
  Petersburg, 
  Va. 
  From 
  the 
  collection 
  

   of 
  John 
  S. 
  Haines, 
  Germantown, 
  Pa. 
  The 
  bones 
  of 
  the 
  Laelaps 
  figured 
  in 
  Plates 
  VIII., 
  IX. 
  and 
  X., 
  are 
  those 
  of 
  tbe 
  

   type 
  specimen 
  from 
  Barnesboro, 
  N. 
  J, 
  

  

  PLATE 
  XL 
  

  

  Fig. 
  1. 
  Mandible 
  of 
  Lytoloma 
  angusta, 
  Cope. 
  One-half 
  natural 
  size. 
  Lateral 
  view. 
  1 
  a, 
  same, 
  from 
  above. 
  

   1 
  b, 
  median 
  lateral 
  marginal 
  bone, 
  lateral 
  view. 
  

  

  Fig. 
  2. 
  Posterior 
  part 
  of 
  carapace 
  of 
  Taphrosphys 
  sulcatus, 
  Leidy. 
  One-fourth 
  natural 
  size. 
  The 
  inner 
  or 
  

   inferior 
  view. 
  (The 
  artist 
  has 
  omitted 
  the 
  distal 
  part 
  of 
  the 
  iliac 
  scar 
  on 
  tbe 
  left 
  middle 
  costal 
  bone 
  of 
  the 
  plate. 
  

  

  Fig. 
  3. 
  Cervical 
  vertebra 
  of 
  Hyposaurus 
  rogersii 
  from 
  behind. 
  Natural 
  size. 
  

  

  Fig. 
  4. 
  Laelaps 
  aquilunguis. 
  Extremity 
  of 
  non-anchylosed 
  sacral 
  vertebra 
  of 
  type 
  specimen. 
  One-third 
  natural 
  

   size. 
  

  

  Fig. 
  5. 
  Lateral 
  view 
  of 
  a 
  second 
  sacral 
  vertebra 
  of 
  same. 
  5 
  a, 
  superior 
  aspect 
  of 
  the 
  same. 
  

  

  Fig. 
  6. 
  Mosasaurus 
  depressus, 
  os 
  quadratum, 
  distal 
  extremity 
  and 
  part 
  posterior 
  hook 
  broken 
  off; 
  external 
  

   view 
  ; 
  one-half 
  natural 
  size 
  ; 
  from 
  type 
  specimen 
  from 
  Burlington 
  Co., 
  N. 
  J. 
  

  

  Fig. 
  7. 
  Mosasaurus 
  maximus, 
  os 
  quadratum 
  with 
  the 
  posterior 
  proximal 
  hook 
  broken 
  off; 
  one-third 
  natural 
  

   size 
  ; 
  external 
  view. 
  Museum 
  Rutger's 
  College. 
  

  

  Fig. 
  8. 
  Suspensorium 
  of 
  Mosasaurus 
  perhaps 
  M. 
  dekayi, 
  from 
  above; 
  5-llth, 
  natural 
  size; 
  8«, 
  posterior 
  part 
  

   of 
  the 
  squamosal 
  bone 
  of 
  the 
  same 
  specimen, 
  in 
  natural 
  relation, 
  except 
  its 
  removal 
  to 
  a 
  short 
  distance 
  to 
  show 
  the 
  

   entering 
  angle 
  of 
  the 
  opisthotic. 
  

  

  Fig. 
  9. 
  Long 
  bone 
  (?) 
  of 
  the 
  pelvis 
  or 
  limbs, 
  of 
  Ehabdopclix 
  longispinis, 
  from 
  the 
  Trias. 
  On 
  the 
  same 
  block 
  

   of 
  sand 
  stone 
  is 
  the 
  section 
  of 
  a 
  vertebra 
  ; 
  natural 
  size. 
  

  

  