﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  

  

  235 
  

  

  This 
  species, 
  the 
  largest 
  of 
  the 
  genus, 
  is 
  found 
  in 
  the 
  upper 
  green 
  sand 
  hed 
  of 
  the 
  upper 
  Cretaceous 
  of 
  New 
  Jer- 
  

   sey. 
  The 
  specimen 
  from 
  which 
  the 
  above 
  description 
  was 
  taken, 
  was 
  found 
  by 
  my 
  friend 
  I. 
  C. 
  Voorhees, 
  in 
  the 
  pits 
  

   of 
  the 
  New 
  Jersey 
  Marl 
  Company, 
  and 
  by 
  the 
  permission 
  of 
  the 
  latter 
  submitted 
  to 
  the 
  writer. 
  

  

  Puppigerus, 
  Cope. 
  

  

  Genus 
  novum 
  Gheloniidarum. 
  

  

  Xiphisternal 
  bones 
  united 
  throughout 
  their 
  length 
  with 
  each 
  other 
  by 
  suture; 
  otherwise 
  as 
  in 
  Chelone. 
  

  

  This 
  genus 
  embraces 
  the 
  Eocene 
  marine 
  turtles 
  of 
  the 
  London 
  clay, 
  and 
  a 
  Miocene 
  species 
  of 
  North 
  America. 
  The 
  

   difference 
  in 
  the 
  structure 
  of 
  the 
  xiphisternals 
  is 
  very 
  material, 
  especially 
  in 
  view 
  of 
  its 
  significant 
  relationships 
  to 
  the 
  

   same 
  portion 
  in 
  various 
  other 
  genera 
  of 
  marine 
  turtles. 
  

  

  The 
  Chelone 
  grandsevus, 
  Leidy, 
  from 
  the 
  Miocene 
  of 
  Shiloh, 
  N. 
  Jersey, 
  belongs 
  to 
  it. 
  Portions 
  of 
  the 
  sternum 
  

   display 
  a 
  higher 
  degree 
  of 
  ossification 
  than 
  in 
  Chelone, 
  the 
  hyo- 
  and 
  hyposternal 
  having 
  a 
  very 
  extensive 
  union, 
  greatly 
  

   restricting 
  the 
  median 
  and 
  lateral 
  fontanelles. 
  This 
  character 
  in 
  the 
  Eocene 
  forms 
  is 
  coincident 
  with 
  the 
  extensive 
  

   union 
  of 
  xiphisternals, 
  and 
  I 
  do 
  not 
  doubt 
  but 
  that 
  that 
  character 
  belongs 
  to 
  the 
  C. 
  grandsevus 
  also. 
  The 
  species 
  of 
  

   the 
  genus 
  will 
  be: 
  

  

  Leidy, 
  

   Ow. 
  & 
  Bell, 
  

  

  Puppigerus 
  granda3vus, 
  

   ' 
  ' 
  longiceps, 
  

  

  Miocene 
  N. 
  Jersey. 
  

   Eocene 
  England. 
  

  

  breviceps, 
  ' 
  ' 
  

  

  convexus, 
  ' 
  ' 
  

  

  latiscutatus, 
  ' 
  ' 
  

  

  subcristatus, 
  ' 
  ' 
  

  

  subcarinatus, 
  ' 
  ' 
  

  

  crassicostatus, 
  " 
  

   '? 
  parviscutum, 
  Cope, 
  

  

  N. 
  Jersey. 
  

  

  PITHOJfOMOBPHA. 
  

  

  Mosasaurus, 
  Conyb. 
  

   Mosasaurus 
  dekayi, 
  Bronn. 
  

  

  A 
  fine 
  specimen 
  of 
  this 
  species 
  was 
  recently 
  exhumed 
  near 
  Mullica 
  Hill, 
  N. 
  Jersey, 
  and 
  submitted 
  to 
  me 
  for 
  ex- 
  

   amination 
  by 
  the 
  owners. 
  The 
  muzzle 
  is 
  like 
  that 
  figured 
  in 
  profile 
  by 
  Leidy, 
  in 
  Cretaceous 
  Rept. 
  N. 
  America, 
  PI. 
  

   XIX, 
  fig. 
  6; 
  and 
  the 
  quadrate, 
  pterygoids, 
  atlas 
  and 
  suspensorium 
  as 
  described 
  by 
  me 
  in 
  the 
  present 
  work, 
  and 
  in 
  

   Proc. 
  Boston 
  Soc. 
  N. 
  History, 
  1869. 
  The 
  teeth 
  are 
  very 
  large, 
  with 
  marked 
  cutting 
  edges 
  and 
  facets. 
  Vertebra? 
  not 
  

   observed. 
  

  

  Prof. 
  Marsh 
  informs 
  me 
  that 
  the 
  most 
  anterior 
  caudals 
  of 
  M. 
  princeps 
  are 
  sub-pentagonal. 
  

  

  