﻿246 
  G. 
  jR. 
  Wieland 
  — 
  Huge 
  Cretaceous 
  Turtles. 
  

  

  Width 
  through 
  orbits 
  -22 
  ± 
  

  

  Height 
  through 
  center 
  of 
  narial 
  opening 
  *095 
  

  

  Height 
  directly 
  back 
  of 
  narial 
  opening 
  *1 
  7 
  

  

  Parietal 
  height 
  (greatest) 
  -28 
  ± 
  

  

  Width 
  of 
  narial 
  opening 
  *07 
  

  

  Length 
  of 
  " 
  " 
  -12 
  

  

  Greatest 
  length 
  of 
  orbit 
  _ 
  *15 
  

  

  " 
  width 
  " 
  _ 
  -115 
  

  

  Length 
  of 
  the 
  inferior 
  edge 
  of 
  the 
  premaxillary 
  -11 
  

  

  Length 
  of 
  inferior 
  edge 
  of 
  the 
  maxillary 
  -20 
  

  

  Length 
  of 
  inferior 
  edge 
  of 
  jugal 
  _ 
  _ 
  . 
  *23 
  

  

  Length 
  from 
  extremity 
  of 
  beak 
  to 
  posterior 
  inferior 
  

  

  extremity 
  of 
  the 
  quadrato-jugal 
  -58 
  

  

  Distance 
  from 
  tip 
  of 
  beak 
  to 
  antorbital 
  border 
  '24 
  

  

  Least 
  distance 
  from 
  postorbital 
  border 
  to 
  the 
  pos- 
  

   terior 
  border 
  of 
  the 
  quadrato-jugal 
  -166 
  

  

  Measurements 
  of 
  the 
  accompanying 
  Mandible. 
  

  

  Greatest 
  antero-posterior 
  length 
  __ 
  *465 
  

  

  Width 
  across 
  articulars 
  . 
  -25 
  ± 
  

  

  Antero-posterior 
  length 
  of 
  symphysis 
  _._ 
  *12 
  

  

  Width 
  at 
  vertex 
  of 
  ramial 
  angle 
  *155 
  

  

  Depth 
  of 
  symphysis 
  at 
  vertex 
  of 
  the 
  ramial 
  angle 
  ._ 
  *11 
  

  

  Extreme 
  length 
  of 
  dentalium 
  . 
  _ 
  -42 
  

  

  Extreme 
  length 
  of 
  angular 
  (lower 
  outer 
  surface) 
  __ 
  -14 
  

  

  The 
  Pelvis 
  of 
  Archelon 
  ischyros. 
  

  

  The 
  pelvis 
  here 
  described 
  is 
  entire, 
  and 
  in 
  nearly 
  perfect 
  

   condition. 
  As 
  collected 
  the 
  parts 
  were 
  imbedded 
  in 
  an 
  indu- 
  

   rated 
  marl 
  in 
  their 
  natural 
  position, 
  with 
  the 
  exception 
  of 
  the 
  

   ilia 
  ; 
  which 
  were 
  slightly 
  inclined 
  laterally. 
  

  

  The 
  notable 
  features 
  of 
  the 
  pelvis 
  figured 
  here 
  are 
  the 
  great 
  

   width, 
  greater 
  than 
  the 
  antero-posterior 
  length, 
  the 
  very 
  broad 
  

   and 
  symmetrical 
  ectopubic 
  expansion, 
  and 
  the 
  diminutive 
  size 
  

   of 
  the 
  obturator 
  foramen, 
  which 
  is 
  entirely 
  closed 
  by 
  the 
  ento- 
  

   pubis 
  and 
  ischium 
  with 
  the 
  consequent 
  reduction 
  of 
  the 
  inter- 
  

   obturator 
  cartilage 
  from 
  a 
  band 
  to 
  a 
  small 
  and 
  solid 
  rhombic 
  

   area 
  with 
  concave 
  sides. 
  These 
  are 
  quite 
  the 
  reverse 
  of 
  the 
  

   relations 
  seen 
  in 
  Thalassochelys. 
  To 
  the 
  general 
  outline 
  of 
  

   the 
  pelvis 
  of 
  Dermochelys 
  there 
  is 
  strong 
  resemblance, 
  with 
  

   the 
  important 
  exceptions 
  that 
  in 
  the 
  latter 
  the 
  ilium 
  is 
  longer 
  

   and 
  slenderer, 
  while 
  the 
  obturator 
  foramen 
  though 
  much 
  

   reduced 
  in 
  size 
  is 
  not 
  enclosed. 
  

  

  The 
  ectopubis 
  increases 
  quite 
  regularly 
  to 
  its 
  greatest 
  thick- 
  

   ness 
  at 
  the 
  heavy 
  anterior 
  border. 
  The 
  entopubis 
  is 
  likewise 
  

   thickest 
  distally, 
  that 
  is 
  near 
  the 
  median 
  line. 
  

  

  The 
  ischia 
  are 
  short 
  and 
  broad, 
  the 
  middle 
  anterior 
  portion 
  

   extending 
  inward 
  and 
  forward 
  to 
  meet 
  the 
  pubis. 
  

  

  