﻿H. 
  G. 
  SEELET 
  ON 
  A 
  DINOSATTRIAN 
  COEACOID. 
  

  

  369 
  

  

  20 
  to 
  21 
  centim. 
  (7 
  T 
  9 
  ^ 
  to 
  8^- 
  in.) 
  wide 
  at 
  the 
  concave 
  posterior 
  

   border. 
  The 
  extreme 
  length 
  of 
  the 
  external 
  margin 
  is 
  33 
  centim. 
  

   (13 
  in.), 
  while 
  the 
  internal 
  margin 
  is 
  about 
  41 
  centim. 
  (16-i- 
  in.) 
  

   long. 
  The 
  suture 
  for 
  the 
  scapula, 
  6, 
  converges 
  anteriorly 
  some- 
  

   what 
  toward 
  the 
  internal 
  sutural 
  margin. 
  The 
  foramen 
  which 
  per- 
  

   forates 
  the 
  coracoid 
  towards 
  its 
  suture 
  with 
  the 
  scapula, 
  d, 
  is 
  oval, 
  

   about 
  4 
  centim. 
  (1J- 
  in.) 
  long 
  by 
  3 
  centim. 
  (1-J- 
  in.) 
  wide, 
  situate 
  3^ 
  

   centim. 
  (1|- 
  in.) 
  from 
  the 
  scapular 
  suture, 
  and 
  about 
  16 
  centim. 
  

   (6^q 
  in.) 
  from 
  the 
  nearest 
  part 
  of 
  the 
  curve 
  of 
  the 
  concave 
  posterior 
  

   border. 
  The 
  external 
  margin 
  of 
  the 
  foramen 
  is 
  rounded. 
  The 
  

   perforation 
  pierces 
  into 
  the 
  middle 
  of 
  the 
  scapular 
  suture 
  ; 
  anterior 
  

   to 
  it 
  the 
  bone 
  is 
  undulated 
  ; 
  and 
  posteriorly 
  the 
  bone 
  is 
  convex 
  

   from 
  before 
  backward, 
  and 
  concave 
  towards 
  the 
  elevated 
  margin 
  

   of 
  the 
  glenoid 
  cavity. 
  At 
  about 
  7J 
  centim. 
  (3 
  in.) 
  behind 
  the 
  cora- 
  

   coid 
  foramen 
  is 
  an 
  oblique 
  deep 
  furrow 
  about 
  8 
  centim. 
  (3-^- 
  in.) 
  

   long, 
  directed 
  backward 
  and 
  inward, 
  but 
  so 
  that 
  if 
  prolonged 
  it 
  would 
  

   nearly 
  reach 
  the 
  posterior 
  angle 
  of 
  the 
  inner 
  margin, 
  e. 
  This 
  groove 
  

   has 
  in 
  its 
  posterior 
  part 
  the 
  appearance 
  of 
  being 
  muscular, 
  and 
  in 
  

   its 
  anterior 
  part 
  a 
  vascular 
  aspect 
  ; 
  on 
  its 
  inner 
  margin 
  the 
  bone 
  is 
  

   rounded, 
  and 
  on 
  its 
  posterior 
  margin 
  it 
  is 
  flattened. 
  

  

  Pig. 
  3. 
  — 
  Internal 
  or 
  Visceral 
  Aspect 
  of 
  Dinosaur 
  ian 
  Coracoid. 
  

  

  a. 
  Glenoid 
  cavity 
  of 
  humerus. 
  b. 
  Sutural 
  surface 
  for 
  scapular. 
  

  

  c. 
  Median 
  margin 
  for 
  union 
  of 
  coracoids. 
  

  

  The 
  internal 
  surface 
  (fig. 
  3) 
  is 
  moderately 
  concave 
  from 
  within 
  

   outward 
  ; 
  and 
  slightly 
  concave 
  in 
  length, 
  or, 
  rather, 
  is 
  divided 
  into 
  

   two 
  concavities, 
  of 
  which 
  the 
  larger 
  and 
  deeper 
  is 
  anterior. 
  But 
  

  

  