﻿234 
  THE 
  EXTINCT 
  BATRACHIA, 
  UEPTILIA 
  

  

  posterior 
  vertebral 
  bones. 
  The 
  posterior 
  marginal 
  bones 
  are 
  not 
  revolute. 
  The 
  costal 
  bones 
  are 
  delicately 
  grooved 
  in 
  

   the 
  length 
  of 
  the 
  carapace. 
  The 
  anterior 
  extremity 
  of 
  the 
  anterior 
  sternal 
  lobe 
  is 
  narrowed, 
  prominent 
  and 
  truncate. 
  

   Length 
  of 
  the 
  whole 
  animal 
  about 
  two 
  feet. 
  

  

  Found 
  near 
  Ft. 
  Bridger, 
  Wyoming 
  Territory, 
  by 
  Dr. 
  Van 
  Carter. 
  

  

  The 
  genus 
  Baptemys 
  to 
  which 
  this 
  species 
  is 
  referred 
  by 
  Leidy, 
  appears 
  to 
  be 
  the 
  same 
  as 
  Adocus. 
  

  

  Adocus 
  pravus, 
  Leidy. 
  

  

  Emys 
  pravus, 
  Leidy, 
  Proc. 
  Ac. 
  Natl. 
  Sci. 
  Phila., 
  1656, 
  303. 
  Cretaceous 
  Rept. 
  U. 
  S., 
  108. 
  Adocus 
  pravus, 
  Cope, 
  

  

  Synopsis 
  Batr. 
  Rept. 
  N. 
  Am., 
  129. 
  

  

  This 
  species 
  is 
  as 
  yet 
  known 
  only 
  from 
  the 
  original 
  specimens, 
  in 
  the 
  collection 
  of 
  the 
  Geological 
  Survey 
  of 
  New 
  

   Jersey. 
  The 
  plastron 
  is 
  thinner 
  than 
  in 
  the 
  three 
  preceding, 
  and 
  the 
  hyosternals 
  embrace 
  the 
  mesostemum 
  extensively. 
  

   This 
  distinguishes 
  the 
  species 
  from 
  A. 
  agilis, 
  where 
  the 
  mesosternal 
  emargination 
  is 
  much 
  wider 
  than 
  deep. 
  Width 
  of 
  

   anterior 
  lobe 
  of 
  sternum 
  at 
  epi-hyosternal 
  suture, 
  four 
  inches. 
  

  

  Upper 
  bed 
  of 
  Cretaceous 
  Green 
  sand, 
  New 
  Jersey. 
  

  

  Adocus 
  agilis, 
  Cope. 
  

   Geological 
  Survey 
  of 
  New 
  Jersey, 
  App. 
  C, 
  p. 
  734. 
  

  

  Represented 
  chiefly 
  by 
  an 
  almost 
  complete 
  plastron 
  from 
  the 
  excavations 
  of 
  the 
  West 
  Jersey 
  Marl 
  Company, 
  in 
  

   the 
  upper 
  bed 
  of 
  the 
  upper 
  Cretaceous 
  Green 
  Sand 
  of 
  New 
  Jersey. 
  

  

  This 
  specimen 
  belonged 
  to 
  an 
  individual 
  of 
  larger 
  size 
  than 
  any 
  heretofore 
  referred 
  to 
  the 
  genus, 
  and 
  one 
  charac- 
  

   teristically 
  ornamented 
  by 
  a 
  peculiar 
  sculpture. 
  

  

  The 
  extremities 
  of 
  both 
  lobes 
  are 
  broken 
  off; 
  the 
  margin 
  of 
  the 
  posterior 
  is 
  thinned 
  out, 
  and 
  carries 
  an 
  acirteness 
  

   of 
  edge 
  to 
  the 
  inguinal 
  notch, 
  where 
  the 
  margin 
  is 
  quite 
  thick. 
  The 
  outline 
  of 
  the 
  caudal 
  scuta 
  is 
  very 
  convex 
  ante- 
  

   riorly; 
  that 
  of 
  the 
  femorals 
  is 
  gently 
  convex 
  towards 
  the 
  front. 
  The 
  suture 
  between 
  the 
  hypo- 
  and 
  xrphisternals 
  is 
  

   nearly 
  transverse 
  below; 
  on 
  the 
  upper 
  face 
  it 
  sends 
  a 
  process 
  into 
  the 
  hyposternals 
  forwards, 
  which 
  is 
  acuminate; 
  the 
  

   hyposternals 
  send 
  a 
  marginal 
  process 
  backwards 
  beyond 
  the 
  line 
  of 
  the 
  median 
  suture, 
  which 
  is 
  squarely 
  truncate; 
  its 
  

   outer 
  edge 
  is 
  the 
  margin 
  of 
  the 
  bone. 
  The 
  impressions 
  of 
  contact 
  of 
  the 
  pubes 
  are 
  well 
  marked; 
  they 
  are 
  strongly 
  in- 
  

   curved, 
  and 
  are 
  not 
  very 
  different 
  from 
  those 
  seen 
  in 
  Cistudo. 
  The 
  bridge 
  of 
  the 
  plastron 
  is 
  preserved, 
  and 
  furnishes 
  

   attachment 
  for 
  three 
  marginal 
  bones; 
  perhaps 
  fractions 
  of 
  others 
  also. 
  The 
  suture 
  between 
  the 
  abdominal 
  and 
  hu- 
  

   meral 
  scuta 
  is 
  convex 
  backwards, 
  and 
  unites 
  with 
  an 
  inner 
  angle 
  of 
  the 
  anterior 
  of 
  the 
  inter-marginal 
  series 
  of 
  the 
  

   bridge. 
  There 
  are 
  three 
  in 
  the 
  latter 
  series, 
  all 
  longer 
  than 
  broad, 
  but 
  the 
  middle 
  one 
  relatively 
  much 
  narrower 
  than 
  

   the 
  others, 
  as 
  it 
  is 
  six 
  times 
  longer 
  than 
  wide, 
  with 
  parallel 
  sides. 
  That 
  anterior 
  to 
  it 
  is 
  more 
  hexagonal 
  and 
  wider, 
  pre- 
  

   senting 
  an 
  angle 
  inwards 
  for 
  union 
  with 
  the 
  suture 
  between 
  the 
  abdominal 
  and 
  humeral 
  scuta. 
  

  

  About 
  half 
  the 
  mesosternal 
  bone 
  is 
  preserved. 
  It 
  is 
  a 
  transverse 
  diamond 
  with 
  truncate 
  extremities. 
  Its 
  poste- 
  

   rior 
  angle 
  is, 
  therefore, 
  very 
  open, 
  but 
  is 
  not 
  rounded. 
  No 
  suture 
  bounding 
  either 
  humeral 
  or 
  gular 
  scuta 
  is 
  visible 
  

   on 
  it; 
  the 
  anterior 
  angle 
  is 
  broken 
  away. 
  The 
  anterior 
  portion 
  of 
  the 
  ephisternal 
  bone 
  preserved 
  has 
  a 
  regular 
  con- 
  

   vex 
  outline, 
  and 
  the 
  sculpture 
  of 
  the 
  inferior 
  surface 
  is 
  a 
  slight 
  imitation 
  of 
  that 
  seen 
  in 
  some 
  species 
  of 
  Trionyx. 
  It 
  

   is 
  closely 
  shallow-punctate, 
  or 
  like 
  small 
  rain-drop 
  impressions. 
  These 
  are 
  irregularly 
  distributed 
  on 
  the 
  anterior 
  

   part 
  of 
  the 
  plastron, 
  and 
  on 
  the 
  posterior 
  lobe 
  in 
  obliquely 
  decussating 
  series. 
  

  

  Width 
  of 
  plastron 
  at 
  bridge, 
  

  

  Length 
  between 
  mesosternum 
  and 
  xiphisternum, 
  

  

  Width 
  posterior 
  lobe 
  at 
  inguinal 
  notch, 
  

  

  " 
  mesosternum, 
  

   Length 
  " 
  

  

  " 
  hyosternum 
  medially, 
  

   Thickness 
  " 
  " 
  

  

  M. 
  M. 
  

  

  

  M.M. 
  

  

  0.2870 
  

  

  Thickness 
  hyosternum 
  at 
  marginal 
  suture, 
  

  

  0.007 
  

  

  0.21 
  

  

  Length 
  abdominal 
  suture, 
  

  

  0.1063 
  

  

  0.1835 
  

  

  ' 
  ' 
  femoral 
  ' 
  ' 
  

  

  0.087 
  

  

  0.091 
  

  

  " 
  median 
  intermarginal 
  suture, 
  

  

  0.0825 
  

  

  0.0695 
  

  

  Width 
  

  

  0.015 
  

  

  0.09 
  

  

  Estimated 
  length 
  plastron, 
  

  

  0.45 
  

  

  0.012 
  

  

  " 
  " 
  carapace, 
  

  

  0.56 
  

  

  