﻿In. 
  

  

  Lin. 
  

  

  11 
  

  

  

  2 
  

  

  11.25 
  

  

  4 
  

  

  6. 
  

  

  4 
  

  

  9. 
  

  

  1 
  

  

  10. 
  

  

  2 
  

  

  9. 
  

  

  1 
  

  

  10. 
  

  

  1 
  

  

  G. 
  

  

  1 
  

  

  4. 
  

  

  2 
  

  

  

  AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  67 
  

  

  Length 
  of 
  portion 
  of 
  femur, 
  

  

  Largest 
  diameter 
  below 
  head, 
  

  

  Convex 
  extent 
  of 
  head, 
  

  

  Circumference 
  of 
  shaft, 
  

  

  Diameter 
  of 
  tibia 
  two 
  inches 
  below 
  head, 
  

  

  Length 
  of 
  condyles 
  of 
  humerus, 
  

  

  Diameter 
  of 
  inner 
  condyle, 
  

  

  " 
  region 
  between 
  condyles, 
  

  

  " 
  shaft 
  2.5 
  inches 
  above 
  condyles, 
  

  

  Greatest 
  diameter 
  of 
  head 
  of 
  rib, 
  

  

  Second 
  — 
  A 
  fifth 
  cervical, 
  two 
  lumbars 
  and 
  fragments 
  of 
  long 
  bones 
  from 
  Birmingham, 
  N. 
  J. 
  The 
  cervical 
  is 
  con- 
  

   siderably 
  larger 
  than 
  the 
  last, 
  and 
  has 
  the 
  arches 
  coossified 
  ; 
  its 
  total 
  length 
  is 
  34^ 
  lines, 
  and 
  is 
  appropriate 
  to 
  the 
  

   adult 
  condition 
  of 
  this 
  animal. 
  The 
  lumbars 
  indicate 
  further 
  the 
  difference 
  between 
  this 
  species 
  and 
  the 
  Hoi. 
  

   obscurus. 
  The 
  cups 
  and 
  shoulder 
  are 
  more 
  expanded 
  latterly 
  than 
  in 
  any 
  species 
  here 
  enumerated, 
  even 
  near 
  the 
  

   sacrum, 
  and 
  the 
  centrum 
  more 
  depressed, 
  and 
  with 
  concave 
  sides. 
  A 
  very 
  obtuse 
  rib 
  extends 
  along 
  the 
  inferior 
  

   face. 
  

  

  In. 
  

  

  Total 
  length, 
  3. 
  *5 
  

  

  Length 
  to 
  shoulder, 
  2.3 
  

  

  Width 
  of 
  cup, 
  . 
  1.76 
  

  

  " 
  shoulder, 
  1.7G 
  

  

  Both 
  of 
  these 
  specimens 
  represent 
  the 
  Crocodilus 
  basitruncatus 
  of 
  Owen, 
  and 
  should 
  

   their 
  reference 
  to 
  the 
  Bottosaurus 
  by 
  Leidy 
  prove 
  erroneous, 
  will 
  indicate 
  a 
  species 
  under 
  

   that 
  specific 
  name. 
  

  

  From 
  the 
  Cretaceous 
  greensand 
  of 
  New 
  Jersey. 
  

  

  HOLOPS, 
  Cope. 
  

  

  This 
  genus, 
  which 
  appears 
  to 
  differ 
  from 
  Thoracosaurus 
  only 
  in 
  the 
  absence 
  of 
  lach- 
  

   rymal 
  fossae, 
  has 
  probably 
  been 
  represented 
  by 
  several 
  species 
  during 
  the 
  Cretaceous 
  period 
  

   in 
  New 
  Jersey. 
  Vertebrae 
  of 
  two 
  species 
  have 
  been 
  described 
  by 
  Leidy 
  as 
  pertaining 
  to 
  

   the 
  genus 
  Crocodilus. 
  All 
  of 
  them 
  differ 
  from 
  the 
  species 
  of 
  the 
  existing 
  six 
  genera 
  of 
  

   Crocodilidae 
  in 
  the 
  absence 
  of 
  elongate 
  hypapophyses 
  on 
  the 
  cervical 
  vertebrae, 
  and 
  their 
  

   replacement 
  by 
  bified 
  or 
  simple 
  often 
  transverse 
  tuberosities. 
  As 
  observed 
  by 
  Leidy, 
  the 
  

   T. 
  macrorhynchus 
  from 
  the 
  cretaceous 
  of 
  France 
  presents 
  a 
  similar 
  character. 
  

  

  The 
  student 
  should 
  also 
  notice 
  that 
  in 
  this 
  genus 
  the 
  axis 
  is 
  the 
  longest 
  vertebra, 
  and 
  

   the 
  third 
  cervical 
  the 
  most 
  constricted. 
  The 
  third 
  cervical 
  vertebra, 
  as 
  well 
  as 
  the 
  axis,. 
  is 
  

   also 
  in 
  Alligator 
  mississippiensis 
  and 
  Crocodilus 
  biporcatus 
  slightly 
  more 
  constricted 
  

   than 
  the 
  succeeding 
  vertebra. 
  The 
  cups 
  widen 
  above 
  to 
  the 
  fourth 
  dorsal; 
  from 
  

   this 
  point 
  to 
  the 
  sixth 
  the 
  centra 
  narrow 
  rapidly, 
  presenting 
  more 
  difference 
  than 
  in 
  the 
  

   same 
  distance 
  elsewhere. 
  The 
  eighth 
  begins 
  to 
  widen 
  again, 
  though 
  still 
  narrowed. 
  

  

  