﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  

  

  93 
  

  

  Depth 
  of 
  glenoid 
  cavity, 
  

  

  Width 
  " 
  

  

  " 
  " 
  anterior 
  expansion, 
  

   " 
  " 
  fractured 
  end, 
  

  

  In. 
  

   3.4 
  

   3.16 
  

   4.22 
  

  

  1.8 
  

  

  Another 
  fragment 
  of 
  an 
  animal 
  of 
  dimensions 
  similar 
  to 
  the 
  last 
  was 
  found 
  at 
  the 
  same 
  

   time 
  and 
  at 
  or 
  near 
  the 
  same 
  place, 
  (Freehold,) 
  in 
  Monmouth 
  county, 
  New 
  Jersey, 
  but 
  

   cannot 
  be 
  associated 
  with 
  the 
  above 
  described 
  scapula, 
  as 
  neither 
  the 
  place 
  nor 
  time 
  of 
  dis- 
  

   covery 
  can 
  be 
  ascertained 
  with 
  sufficient 
  accuracy. 
  It 
  appears 
  to 
  be 
  the 
  glenoid 
  cavity 
  of 
  

   a 
  scapula 
  from 
  which 
  the 
  blade 
  has 
  been 
  broken 
  off, 
  and 
  from 
  which 
  a 
  short 
  subconic 
  

   procoracoid 
  projects. 
  The 
  accompanying 
  cut 
  and 
  measurements 
  will 
  furnish 
  the 
  requisite 
  

   information 
  respecting 
  it. 
  

  

  Fig. 
  28. 
  

  

  Length 
  from 
  a 
  to 
  b, 
  

   " 
  b 
  to 
  c, 
  

   " 
  d 
  to 
  e, 
  

  

  • 
  " 
  e 
  to 
  /, 
  

  

  Inches. 
  

   5.54 
  

   7.22 
  

   4.71 
  

   3.53 
  

  

  The 
  fragment 
  may 
  belong 
  to 
  Mosasaurus. 
  

  

  Pelvis. 
  — 
  There 
  is 
  much 
  difficulty 
  in 
  determining 
  the 
  true 
  relations 
  of 
  the 
  pelvic 
  ele- 
  

   ments 
  of 
  these 
  and 
  other 
  Dinosauria, 
  owing 
  to 
  their 
  unusual 
  forms, 
  our 
  imperfect 
  materials, 
  

   and 
  the 
  discrepancies 
  between 
  authors. 
  

  

  Ilium. 
  — 
  One 
  of 
  our 
  best 
  clues 
  is 
  the 
  skeleton 
  of 
  the 
  Iguanodon 
  discovered 
  at 
  Maid- 
  

   stone, 
  and 
  preserved 
  on 
  a 
  block 
  of 
  rag, 
  which 
  has 
  been 
  described 
  and 
  figured 
  by 
  Professor 
  

   Owen. 
  The 
  bones 
  mostly 
  preserve 
  a 
  normal 
  though 
  much 
  disturbed 
  relation 
  to 
  each 
  

   other. 
  An 
  examination 
  of 
  the 
  figure 
  and 
  description 
  strongly 
  suggests 
  — 
  

  

  First, 
  that 
  the 
  hooked 
  superior 
  prolongation 
  of 
  the 
  ilium 
  is 
  the 
  posterior, 
  not 
  the 
  an- 
  

   terior, 
  as 
  described 
  by 
  Owen. 
  This 
  is 
  confirmed 
  by 
  Owen's 
  figure 
  and 
  description 
  of 
  the 
  

   ilium 
  and 
  sacrum 
  of 
  the 
  same 
  species 
  in 
  Wealden 
  Reptiles, 
  PI. 
  III. 
  (Iguanodon), 
  where 
  

   the 
  thick 
  hook-like 
  process 
  with 
  its 
  abrupt 
  descent 
  to 
  the 
  acetabulum, 
  is 
  also 
  posterior. 
  

  

  The 
  structure 
  of 
  Hadrosaurus, 
  in 
  which 
  both 
  caudal 
  and 
  lumbar 
  vertebra? 
  have 
  been 
  

   discovered, 
  proves 
  that 
  this 
  relation 
  is 
  the 
  true 
  one. 
  The 
  caudals 
  have 
  a 
  greater 
  trans- 
  

   verse 
  diameter 
  than 
  the 
  lumbars, 
  which 
  are 
  comparatively 
  quite 
  contracted 
  from 
  side 
  to 
  

   side. 
  This 
  is 
  the 
  reverse 
  of 
  what 
  is 
  usual 
  among 
  reptilia, 
  where 
  the 
  caudals 
  are 
  usually 
  

  

  AMER.I. 
  PHILOSO. 
  SOC. 
  — 
  VOL. 
  XIV. 
  24 
  

  

  