﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  

  

  53 
  

  

  Fij;. 
  8. 
  

  

  Fig. 
  9. 
  

  

  Fig. 
  10. 
  

  

  Pelvic 
  Arch. 
  

  

  The 
  shaft 
  is 
  flattened 
  cylindric; 
  much 
  flattened 
  nearest 
  the 
  proximal 
  extremity. 
  The 
  latter 
  is 
  very 
  ohlique 
  to 
  

   the 
  shaft 
  and 
  slightly 
  convex 
  near 
  the 
  proximal 
  margin. 
  

  

  The 
  end 
  of 
  the 
  muzzle 
  preserved, 
  includes 
  also 
  the 
  symphysis 
  and 
  parts 
  of 
  the 
  rami 
  of 
  the 
  mandible. 
  The 
  parts 
  

   have 
  been 
  crushed 
  together, 
  and 
  the 
  ends 
  of 
  the 
  teeth 
  broken 
  off. 
  The 
  alveoli 
  of 
  the 
  two 
  jaws 
  incline 
  at 
  a 
  narrow 
  

   angle 
  to 
  each 
  other, 
  hence 
  the 
  teeth 
  which 
  alternate, 
  cross 
  each 
  other 
  near 
  the 
  middles 
  of 
  the 
  crowns. 
  The 
  parts 
  

   preserved 
  appear 
  to 
  belong 
  to 
  the 
  premaxillary 
  bone, 
  though 
  no 
  suture 
  can 
  be 
  found, 
  and 
  the 
  bony 
  walls 
  are 
  so 
  thin 
  

   as 
  to 
  render 
  their 
  obliteration 
  a 
  probability. 
  There 
  is 
  a 
  keeled 
  ridge 
  along 
  the 
  middle 
  line 
  above, 
  which 
  is 
  not 
  

   continued 
  to 
  the 
  margin 
  of 
  the 
  bone. 
  The 
  form 
  of 
  the 
  muzzle 
  is 
  narrow, 
  the 
  sides 
  subparallel 
  near 
  the 
  tip, 
  which 
  is 
  

   elongate 
  rounded. 
  The 
  mandibular 
  symphysis, 
  however, 
  is 
  not 
  very 
  elongate, 
  as 
  the 
  rami 
  are 
  given 
  off 
  at 
  three 
  inches 
  

   from 
  the 
  tip. 
  The 
  latter 
  appear 
  to 
  have 
  been 
  quite 
  slender 
  from 
  various 
  small 
  sections 
  or 
  pieces 
  sent 
  with 
  the 
  muzzle, 
  

   The 
  premaxillary 
  border 
  of 
  4 
  in. 
  7 
  lin. 
  exhibits 
  eight 
  teeth, 
  or 
  their 
  alveoli, 
  of 
  which 
  the 
  median 
  two 
  are 
  close 
  

   together, 
  and 
  not 
  separated 
  by 
  any 
  mandibulars. 
  The 
  sections 
  of 
  the 
  teeth 
  ai 
  - 
  e 
  round 
  or 
  oval, 
  and 
  their 
  sizes 
  are 
  

   irregular 
  probably 
  on 
  account 
  of 
  differing 
  age, 
  and 
  degree 
  of 
  protrusion: 
  the 
  diameters 
  at 
  alveolar 
  margin 
  vary 
  from 
  

   6 
  lines 
  to 
  3. 
  Their 
  form 
  is 
  slender 
  conic, 
  or 
  with 
  the 
  root 
  slender 
  fusiform, 
  and 
  the 
  pulp 
  cavity 
  is 
  small 
  and 
  median, 
  

   AMERI 
  PHILOSO. 
  SOC. 
  — 
  VOL. 
  XIV. 
  14 
  

  

  