﻿CHONDROSTEID^I. 
  

  

  a. 
  Fig. 
  9. 
  

  

  37 
  

  

  b. 
  

  

  Eight 
  hyomandibular 
  of 
  Gyrosteus 
  mirabilis, 
  lateral 
  aspect 
  (a), 
  and 
  

   posterior 
  aspect 
  (b), 
  one-third 
  nat. 
  size. 
  [No. 
  P. 
  3356 
  a.] 
  

  

  P. 
  3356 
  1. 
  Left 
  maxilla, 
  shown 
  of 
  one-quarter 
  the 
  natural 
  size 
  from 
  

   the 
  outer, 
  anterior, 
  and 
  inferior 
  aspects 
  in 
  fig. 
  10. 
  It 
  

   differs 
  from 
  the 
  corresponding 
  bone 
  of 
  the 
  recent 
  Aci- 
  

   jpenser 
  (fig. 
  11) 
  in 
  the 
  relatively 
  greater 
  steepness 
  of 
  the 
  

   anterior 
  border, 
  and 
  in 
  the 
  straightness, 
  shortness, 
  and 
  

   posterior 
  expansion 
  of 
  the 
  hinder 
  half 
  of 
  the 
  element. 
  

  

  