﻿art. 
  28 
  SKULL 
  OF 
  ZARHACHIS 
  FLAGELLATOR 
  KELLOGG 
  11 
  

  

  loss 
  flattened 
  and 
  slopes 
  obliquely 
  upward 
  and 
  inward. 
  There 
  is 
  

   no 
  distinct 
  preorbital 
  apophysis, 
  but 
  the 
  postorbital 
  projection 
  is 
  

   rather 
  long 
  and 
  attenuate. 
  The 
  orbit 
  is 
  relatively 
  longer 
  than 
  in 
  

   Lipotes. 
  The 
  lachrymal 
  and 
  jugal 
  are 
  missing. 
  

  

  As 
  on 
  the 
  first 
  skull, 
  the 
  zygomatic 
  process 
  of 
  the 
  squamosal 
  is 
  

   greatly 
  thickened 
  dorso-ventrally 
  in 
  contrast 
  to 
  the 
  long 
  attenuate 
  

   process 
  of 
  Inia 
  and 
  Lipotes. 
  As 
  viewed 
  from 
  the 
  side, 
  the 
  slope 
  of 
  

   the 
  posterior 
  half 
  of 
  the 
  dorsal 
  profile 
  of 
  the 
  zygomatic 
  process 
  is 
  

   very 
  steep 
  ; 
  the 
  inferior 
  profile 
  is 
  biconcave. 
  The 
  anterior 
  extremity 
  

   is 
  bluntly 
  pointed; 
  the 
  postglenoid 
  process 
  is 
  relatively 
  thin 
  and 
  

   curves 
  forward. 
  The 
  greatest 
  length 
  of 
  the 
  right 
  zygomatic 
  process 
  

   along 
  the 
  glenoid 
  face 
  is 
  98 
  mm. 
  and 
  the 
  greatest 
  depth 
  near 
  the 
  

   middle 
  is 
  57.5 
  mm. 
  

  

  Attention 
  has 
  already 
  been 
  called 
  to 
  the 
  distortion 
  which 
  has 
  

   resulted 
  from 
  crushing. 
  In 
  addition 
  to 
  the 
  previously 
  mentioned 
  

   details, 
  it 
  may 
  be 
  noted 
  that 
  the 
  lateral 
  platelike 
  extension 
  of 
  the 
  

   frontal 
  and 
  the 
  superimposed 
  maxilla 
  have 
  been 
  depressed 
  below 
  

   their 
  original 
  level. 
  A 
  thin 
  layer 
  of 
  matrix 
  lies 
  between 
  the 
  upper 
  

   surface 
  of 
  the 
  anterior 
  half 
  of 
  the 
  zygomatic 
  process 
  and 
  the 
  bones 
  

   mentioned 
  above. 
  

  

  The 
  temporal 
  fossa 
  is 
  relatively 
  short 
  and 
  produced 
  backward 
  

   beyond 
  the 
  level 
  of 
  the 
  main 
  body 
  of 
  the 
  supraoccipital. 
  Within 
  

   the 
  fossa 
  the 
  parietals 
  and 
  frontals 
  have 
  buckled 
  as 
  mentioned 
  before, 
  

   producing 
  some 
  irregularities. 
  As 
  in 
  Inia 
  and 
  Lipotes, 
  the 
  parietal 
  

   is 
  more 
  or 
  less 
  crescentic 
  in 
  shape; 
  it 
  curves 
  around 
  the 
  squamosal 
  

   on 
  the 
  external 
  wall 
  of 
  the 
  braincase 
  and 
  contributes 
  the 
  posterior 
  

   border 
  of 
  the 
  temporal 
  fossa 
  and 
  the 
  external 
  plate 
  of 
  the 
  bipartite 
  

   lambdoid 
  crest, 
  extending 
  downward 
  behind 
  the 
  squamosal 
  until 
  it 
  

   meets 
  the 
  exoccipital 
  on 
  the 
  lower 
  margin 
  of 
  the 
  temporal 
  fossa. 
  

   Anteriorly 
  and 
  superiorly, 
  the 
  parietal 
  is 
  suturally 
  united 
  with 
  the 
  

   frontal 
  and 
  inferiorly 
  it 
  abuts 
  against 
  the 
  alisphenoid. 
  The 
  lateral 
  

   extremity 
  of 
  the 
  exoccipital 
  is 
  relatively 
  thin 
  and 
  is 
  directed 
  back- 
  

   ward. 
  The 
  condyles 
  are 
  large, 
  knoblike 
  in 
  contour, 
  and 
  project 
  

   beyond 
  the 
  level 
  of 
  the 
  exoccipital. 
  Most 
  of 
  the 
  lower 
  border 
  as 
  

   well 
  as 
  the 
  anterior 
  end 
  of 
  the 
  external 
  reduplication 
  of 
  the 
  pterygoid 
  

   is 
  missing, 
  exposing 
  the 
  axial 
  ridge 
  of 
  the 
  vomer. 
  The 
  falcate 
  process 
  

   of 
  the 
  basioccipital 
  does 
  not 
  project 
  below 
  the 
  postglenoid 
  process. 
  

  

  Ventral 
  view. 
  — 
  The 
  description 
  of 
  the 
  rostrum 
  in 
  the 
  preceding 
  

   paper 
  fully 
  covered 
  this 
  part 
  of 
  the 
  skull 
  and 
  it 
  seems 
  unnecessary 
  to 
  

   repeat 
  some 
  of 
  the 
  peculiarities 
  in 
  the 
  present 
  paper, 
  especially 
  as 
  

   no 
  additional 
  structural 
  details 
  are 
  shown. 
  It 
  will 
  also 
  be 
  noted 
  

   that 
  the 
  palatal 
  surface 
  of 
  this 
  skull 
  (pi. 
  5) 
  is 
  not 
  as 
  well 
  preserved 
  as 
  

   on 
  the 
  first 
  skull. 
  Some 
  additional 
  details 
  are 
  revealed 
  which 
  

   necessitate 
  a 
  modification 
  of 
  the 
  interpretation 
  given 
  for 
  the 
  relations 
  

   of 
  the 
  pterygoids 
  on 
  the 
  first 
  skull. 
  

  

  