﻿18 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL. 
  MUSEUM 
  Vol. 
  67, 
  abt. 
  82 
  

  

  . 
  EXPLANATION 
  OF 
  PLATES 
  

  

  Zarhachis 
  flagellator 
  Cope. 
  Cat. 
  No. 
  10,911, 
  division 
  of 
  vertebrate 
  paleontology, 
  

   United 
  States 
  National 
  Museum. 
  Calvert 
  formation, 
  western 
  shore 
  of 
  Chesa- 
  

   peake 
  Bay, 
  about 
  3% 
  miles 
  south 
  of 
  Chesapeake 
  Beach, 
  Calvert 
  County, 
  Md. 
  

   Collected 
  by 
  Norman 
  H. 
  Boss, 
  December 
  30, 
  1923. 
  

  

  Plate 
  1 
  

  

  Dorsal 
  view 
  of 
  skull 
  of 
  Zarhachis 
  flagellator 
  Cope. 
  About 
  Yh 
  natural 
  size. 
  

   The 
  following 
  abbreviations 
  are 
  used 
  on 
  plates 
  1 
  to 
  5. 
  Bo., 
  basioccipital; 
  Bs., 
  

   basisphenoid; 
  C, 
  condyle; 
  Cr. 
  I., 
  lambdoid 
  crest; 
  Cr. 
  max., 
  maxillary 
  crest; 
  

   Ed., 
  ectethmoid; 
  Ex. 
  oc, 
  exoccipital; 
  Ex. 
  pt., 
  external 
  reduplication 
  of 
  the 
  

   pterygoid; 
  Ex. 
  aud. 
  M., 
  groove 
  for 
  external 
  auditory 
  meatus; 
  Fal. 
  pr., 
  falcate 
  

   process 
  of 
  basioccipital; 
  F. 
  m., 
  foramen 
  magnum; 
  Fo. 
  c, 
  condylar 
  foramen; 
  

   Fo. 
  inf., 
  ventral 
  orifice 
  of 
  infraorbital 
  canal; 
  Fo. 
  I. 
  p., 
  foramen 
  lacerum 
  posterius, 
  

   compartment 
  for 
  vein; 
  Fo. 
  max., 
  maxillary 
  foramen 
  at 
  posterior 
  extremity 
  of 
  the 
  

   premaxilla; 
  Fo. 
  ov., 
  foramen 
  ovale; 
  Fo. 
  pmx., 
  premaxillary 
  foramen; 
  Fr., 
  frontal; 
  

   J. 
  inc., 
  jugular 
  incisure; 
  Max., 
  maxilla; 
  N. 
  A., 
  left 
  nasal 
  passage; 
  Na., 
  nasal; 
  

   Pa., 
  parietal; 
  Pmx., 
  premaxilla; 
  Poc. 
  pr., 
  paroccipital 
  process 
  of 
  exoccipital; 
  

   P. 
  pr., 
  postglenoid 
  process 
  of 
  squamosal; 
  Prs., 
  presphenoid; 
  Pi., 
  vaginal 
  process 
  

   of 
  pterygoid; 
  S. 
  oc, 
  supraoccipital; 
  S. 
  or. 
  pr., 
  supraorbital 
  process 
  of 
  frontal; 
  

   Sq., 
  squamosal; 
  Vo., 
  vomer; 
  Zyg., 
  zygomatic 
  process 
  of 
  squamosal; 
  1, 
  foramen 
  

   in 
  alisphenoid 
  above 
  the 
  anterior 
  process 
  of 
  the 
  periotic; 
  2, 
  passage 
  for 
  mandibular 
  

   branch 
  of 
  trigeminal 
  nerve 
  in 
  a 
  cleft 
  on 
  posterior 
  border 
  of 
  alisphenoid; 
  S, 
  

   foramen 
  lacerum 
  posterius, 
  compartment 
  for 
  nerves. 
  

  

  Plate 
  2 
  

  

  Frontal 
  view 
  of 
  skull 
  of 
  Zarhachis 
  flagellator 
  Cope 
  showing 
  position 
  of 
  the 
  

   crescentic 
  foramina. 
  About 
  % 
  natural 
  size. 
  

  

  Plate 
  3 
  

   Posterior 
  view 
  of 
  skull 
  of 
  Zarhachis 
  flagellator 
  Cope. 
  About 
  % 
  natural 
  size. 
  

  

  Plate 
  4 
  

   Lateral 
  view 
  of 
  skull 
  of 
  Zarhachis 
  flagellator 
  Cope. 
  About 
  H 
  natural 
  size. 
  

  

  Plate 
  5 
  

   Ventral 
  view 
  of 
  skull 
  of 
  Zarhachis 
  flagellator 
  Cope. 
  About 
  % 
  natural 
  size. 
  

  

  18 
  

  

  