﻿4 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  67 
  

  

  supraorbital 
  process. 
  The 
  maxilla 
  sheathes 
  the 
  internal 
  face 
  of 
  this 
  

   "upended" 
  process 
  and 
  its 
  outer 
  margin 
  follows 
  the 
  crest 
  of 
  the 
  

   latter. 
  Behind 
  this 
  process, 
  the 
  maxilla 
  expands 
  horizontally 
  and 
  is 
  

   applied 
  to 
  the 
  platelike 
  lateral 
  extension 
  of 
  the 
  frontal 
  which 
  in 
  turn 
  

   contributes 
  the 
  roof 
  for 
  the 
  temporal 
  fossa. 
  The 
  temporal 
  fossae 
  

   are 
  not 
  visible 
  from 
  a 
  dorsal 
  view 
  and 
  the 
  external 
  margin 
  of 
  the 
  

   maxilla 
  curves 
  backward 
  from 
  the 
  postorbital 
  projection 
  to 
  the 
  trans- 
  

   verse 
  crest 
  of 
  the 
  supraoccipital. 
  At 
  the 
  level 
  of 
  the 
  nasals 
  the 
  

   whole 
  maxilla 
  curves 
  strongly 
  upward 
  to 
  the 
  transverse 
  crest 
  of 
  

   the 
  supraoccipital. 
  The 
  dorsal 
  margin 
  of 
  the 
  supraoccipital 
  and 
  the 
  

   posterior 
  borders 
  of 
  the 
  maxillae 
  together 
  comprise 
  the 
  transverse 
  

   lambdoid 
  crest. 
  Behind 
  the 
  temporal 
  fossae 
  the 
  lateral 
  margins 
  of 
  

   the 
  supraoccipital 
  are 
  applied 
  to 
  the 
  posterior 
  borders 
  of 
  the 
  parietals 
  

   and 
  these 
  combined 
  bones 
  form 
  the 
  thin 
  posteriorly 
  directed 
  lambdoid 
  

   crest 
  which 
  follows 
  the 
  curvature 
  of 
  the 
  inner 
  and 
  lower 
  margins 
  of 
  

   each 
  temporal 
  fossa. 
  

  

  As 
  in 
  the 
  other 
  skull 
  (Cat, 
  No. 
  10485, 
  U.S.N.M.) 
  the 
  raised 
  con- 
  

   vex 
  portions 
  of 
  the 
  premaxillae 
  are 
  widest 
  in 
  front 
  of 
  the 
  premaxillary 
  

   foramina 
  and 
  taper 
  rapidly 
  posterior 
  to 
  the 
  latter, 
  disappearing 
  in 
  

   front 
  of 
  the 
  nasal 
  passages. 
  Both 
  premaxillary 
  foramina 
  are 
  com- 
  

   pressed 
  dorso-ventrally 
  and 
  of 
  large 
  size; 
  the 
  greatest 
  diameter 
  of 
  

   the 
  right 
  foramen 
  is 
  10.5 
  mm. 
  The 
  right 
  foramen 
  is 
  situated 
  42 
  

   mm. 
  in 
  front 
  of 
  the 
  level 
  of 
  the 
  antorbital 
  notches 
  and 
  the 
  left 
  37 
  

   mm. 
  From 
  each 
  foramen 
  a 
  broad 
  groove 
  passes 
  forward 
  along 
  the 
  

   internal 
  border 
  of 
  the 
  raised 
  convex 
  outer 
  portion 
  of 
  the 
  premaxilla. 
  

   On 
  the 
  other 
  skull 
  a 
  groove 
  also 
  extends 
  backward 
  from 
  each 
  fora- 
  

   men 
  in 
  an 
  oblique 
  direction 
  across 
  the 
  premaxilla 
  and 
  terminates 
  

   near 
  the 
  level 
  of 
  the 
  posterior 
  margin 
  of 
  the 
  "upended" 
  crestlike 
  

   portion 
  of 
  the 
  supraorbital 
  process. 
  On 
  the 
  second 
  skull 
  the 
  orifice 
  

   of 
  the 
  premaxillary 
  foramen 
  looks 
  inward 
  and 
  forward. 
  This 
  change 
  

   in 
  direction 
  of 
  the 
  foramen 
  leaves 
  the 
  posterior 
  margin 
  elevated 
  above 
  

   the 
  level 
  of 
  the 
  anterior 
  groove 
  and 
  shuts 
  off 
  the 
  posterior 
  groove 
  at 
  

   the 
  source. 
  The 
  premaxillae 
  are 
  separated 
  by 
  an 
  interval 
  of 
  17 
  mm. 
  

   above 
  the 
  porous 
  pluglike 
  portion 
  of 
  the 
  presphenoid. 
  The 
  pre- 
  

   sphenoid 
  does 
  not 
  rise 
  to 
  the 
  level 
  of 
  the 
  premaxillae, 
  as 
  in 
  the 
  first 
  

   skull. 
  Behind 
  the 
  level 
  of 
  the 
  antorbital 
  notches 
  the 
  dorsal 
  aspect 
  

   of 
  the 
  ascending 
  process 
  of 
  each 
  premaxilla 
  is 
  convexo-concave, 
  the 
  

   surface 
  sloping 
  from 
  the 
  external 
  to 
  the 
  internal 
  margin. 
  Between 
  

   the 
  nasal 
  passages 
  and 
  the 
  antorbital 
  notches 
  the 
  internal 
  border 
  of 
  

   each 
  premaxilla 
  is 
  deflected 
  obliquely 
  downward. 
  The 
  peculiarities 
  

   of 
  the 
  premaxillae 
  are 
  essentially 
  the 
  same 
  on 
  both 
  skulls. 
  At 
  the 
  

   level 
  of 
  the 
  anterior 
  margins 
  of 
  the 
  nasals 
  the 
  premaxillae 
  are 
  quite 
  

   deep, 
  and 
  at 
  the 
  postero-external 
  angle 
  the 
  dorsal 
  surface 
  is 
  raised 
  

   at 
  least 
  20 
  mm. 
  above 
  the 
  horizontally 
  expanded 
  plate 
  of 
  the 
  max- 
  

   illa. 
  The 
  posterior 
  end 
  of 
  each 
  premaxilla 
  is 
  obliquely 
  truncated, 
  

  

  