﻿142 
  

  

  0. 
  C. 
  Marsh 
  — 
  The 
  Stylinodontia. 
  

  

  The 
  inner 
  structure 
  of 
  the 
  shaft 
  is 
  shown 
  in 
  figure 
  7, 
  h. 
  The 
  pecu- 
  

   liar 
  head 
  of 
  this 
  humerus, 
  with 
  its 
  strong 
  tuberosity, 
  the 
  promi- 
  

   nent 
  deltoid 
  ridge, 
  and 
  the 
  supinator 
  crest 
  below, 
  together 
  with 
  

   the 
  supracondylar 
  foramen 
  and 
  distal 
  articulation, 
  are 
  all 
  char- 
  

   acteristic 
  features, 
  and 
  taken 
  together 
  clearly 
  indicate 
  the 
  

   Edentate 
  nature 
  of 
  the 
  animal 
  to 
  which 
  this 
  bone 
  belonged. 
  

  

  Figure 
  6. 
  — 
  Left 
  humerus 
  of 
  Stylinodon 
  mirus 
  ; 
  front 
  view. 
  

  

  cf, 
  supracondylar 
  foramen; 
  rfr, 
  deltoid 
  ridge; 
  h, 
  head; 
  t, 
  external 
  

  

  tuberosity 
  ; 
  rs, 
  supinator 
  ridge. 
  

   Figure 
  7. 
  — 
  Ends 
  and 
  section 
  of 
  same 
  bone. 
  

  

  a, 
  proximal 
  end 
  ; 
  b, 
  transverse 
  section 
  ; 
  c, 
  distal 
  end. 
  

   All 
  the 
  figures 
  are 
  one-half 
  natural 
  size. 
  

  

  The 
  radius 
  and 
  ulna 
  are 
  shown 
  in 
  position 
  in 
  figure 
  5. 
  The 
  

   radius 
  (r) 
  is 
  much 
  the 
  smaller 
  bone, 
  and 
  is 
  placed 
  nearly 
  in 
  

   front 
  of 
  the 
  ulna 
  (u). 
  The 
  latter 
  is 
  quite 
  robust, 
  and 
  has 
  a 
  

   strong, 
  powerful 
  olecranon 
  process, 
  as 
  shown 
  in 
  the 
  figure. 
  

   These 
  bones 
  also 
  are 
  Edentate 
  in 
  type. 
  

  

  