﻿164 
  THE 
  EXTINCT 
  UATRACHIA, 
  REPTILIA 
  

  

  The 
  humeri 
  are 
  short, 
  with 
  stout 
  head 
  and 
  condyles, 
  slender 
  shaft, 
  and 
  considerable 
  curvature. 
  Head 
  presented 
  

  

  inwards 
  and 
  upwards; 
  condyles 
  downwards, 
  the 
  outer 
  angle 
  most 
  prominent. 
  A 
  slight 
  tuberosity 
  on 
  inferior 
  aspect 
  

  

  near 
  inner 
  angle. 
  Outer 
  outline 
  of 
  shaft 
  quite 
  concave. 
  Deltoid 
  ridge 
  a 
  prominent 
  crest, 
  its 
  posterior 
  margin 
  falling 
  

  

  considerably 
  short 
  of 
  the 
  head; 
  the 
  outer 
  margin 
  continuous, 
  convex. 
  Postero-inferior 
  crest 
  broken; 
  the 
  planes 
  of 
  the 
  

  

  two 
  make 
  a 
  little 
  more 
  than 
  a 
  right 
  angle 
  with 
  each 
  other. 
  

  

  M. 
  

  

  Total 
  length 
  humerus, 
  (straight) 
  .097 
  

  

  Diameter 
  condyles, 
  .025 
  

  

  " 
  deltoid 
  crest 
  to 
  middle 
  shaft, 
  .02 
  

  

  " 
  shaft 
  at 
  middle 
  (transverse), 
  .009 
  

  

  Nothing 
  but 
  a 
  fragment 
  of 
  the 
  great 
  trochanter 
  with 
  head, 
  is 
  left 
  of 
  the 
  femur. 
  The 
  former 
  is 
  continuous 
  with 
  

  

  the 
  latter, 
  straight; 
  with 
  flat 
  outer 
  side, 
  and 
  narrow. 
  Form 
  quite 
  as 
  in 
  Propleura. 
  

  

  This 
  individual 
  appears 
  to 
  be 
  mature. 
  Its 
  remains 
  are 
  accompanied 
  by 
  a 
  few 
  fragments 
  of 
  a 
  large 
  individual, 
  of 
  

  

  this 
  species 
  or 
  T. 
  sulcatus. 
  

  

  Position. 
  The 
  upper 
  green 
  sand 
  bed 
  of 
  the 
  Upper 
  Cretaceous 
  of 
  New 
  Jersey. 
  Discovered 
  by 
  John 
  Haines. 
  

  

  TAPHROSPHYS 
  SULCATUS, 
  Leidy. 
  

  

  Platernys 
  sulcatus, 
  Leidy. 
  Proceed. 
  Acad. 
  Nat. 
  Sciences, 
  Phila., 
  1856, 
  303. 
  Cretaceous 
  Reptiles, 
  109. 
  Tab. 
  

   XIX, 
  fig. 
  4. 
  

  

  Pubis 
  attached 
  to 
  a 
  narrow, 
  little 
  elevated 
  longitudinal 
  sutural 
  surface. 
  Margins 
  of 
  sternum 
  thin, 
  flat; 
  surface 
  

   deeply 
  recticulate 
  grooved; 
  bones, 
  especially 
  the 
  marginal, 
  thin, 
  light, 
  costals 
  thinned 
  at 
  margins; 
  mesosternum 
  longer 
  

   than 
  wide. 
  

  

  This 
  species 
  is 
  so 
  fragile 
  as 
  to 
  be 
  rarely 
  preserved 
  in 
  more 
  than 
  a 
  few 
  pieces. 
  The 
  largest 
  part 
  of 
  a 
  single 
  indi- 
  

   vidual 
  that 
  has 
  come 
  under 
  my 
  notice, 
  consists 
  of 
  the 
  more 
  or 
  less 
  complete 
  posterior 
  three 
  costal 
  bones 
  of 
  the 
  cara- 
  

   pace, 
  with 
  last 
  vertebral 
  marginal, 
  some 
  anterior 
  costals, 
  xiphisternum, 
  etc. 
  Another 
  similar 
  series 
  of 
  fragments 
  of 
  

   another 
  individual 
  was 
  procured 
  at 
  the 
  same 
  time 
  and 
  place, 
  i. 
  e., 
  near 
  Barnesboro, 
  N. 
  J. 
  

  

  These 
  specimens 
  show 
  that 
  the 
  last 
  pair 
  of 
  costals 
  is 
  not 
  separated 
  by 
  a 
  vertebral 
  bone, 
  and 
  the 
  penultimate 
  

   pair 
  is 
  only 
  separated 
  at 
  their 
  anterior 
  part. 
  This 
  last 
  vertebral 
  is 
  of 
  reduced 
  and 
  rounded 
  proportions; 
  the 
  one 
  pre- 
  

   ceding 
  it 
  is 
  of 
  the 
  normal 
  form, 
  i. 
  e., 
  with 
  elongate 
  postero-lateral 
  border. 
  The 
  costal 
  capitula 
  are 
  developed 
  on 
  all 
  the 
  

   bones. 
  Sutural 
  surfaces 
  are 
  present 
  on 
  the 
  inferior 
  face 
  of 
  the 
  proximal 
  and 
  contiguous 
  pairs 
  of 
  costal 
  bones, 
  for 
  the 
  

   attachment 
  of 
  rudimental 
  and 
  inferiorly 
  placed 
  vertebral 
  pieces. 
  One 
  elongate 
  extends 
  from 
  the 
  last 
  true 
  vertebral 
  

   over 
  the 
  anterior 
  margin 
  of 
  the 
  last 
  pair 
  of 
  costals. 
  The 
  latter 
  have 
  two 
  scars; 
  the 
  anterior 
  rectangular, 
  the 
  posterior 
  

   ovate. 
  The 
  pygal 
  bone 
  is 
  elongate 
  ovate 
  anteriorly; 
  inferiorly 
  it 
  presents 
  a 
  flattened 
  longitudinal 
  ridge, 
  and 
  an 
  ele- 
  

   vation 
  on 
  the 
  anterior 
  part 
  of 
  the 
  lateral 
  margin. 
  

  

  The 
  last 
  costal 
  has 
  a 
  very 
  irregular 
  inferior 
  surface. 
  Its 
  proximal 
  part 
  is 
  thickened, 
  and 
  then 
  rises 
  outwardly 
  

   into 
  the 
  ridge, 
  that 
  margins 
  the 
  iliac 
  pit. 
  This 
  ridge 
  is 
  most 
  elevated 
  on 
  the 
  capitulum, 
  and 
  develops 
  an 
  acute 
  pro- 
  

   cess 
  outwards 
  from 
  it. 
  The 
  posterior 
  part 
  of 
  the 
  pit 
  is 
  occupied 
  by 
  an 
  ovoid 
  bone, 
  truncate 
  outwardly 
  where 
  it 
  articu- 
  

   lates 
  with 
  the 
  ilium, 
  which 
  appears 
  to 
  be 
  a 
  rudimental 
  costal 
  element 
  belonging 
  to 
  the 
  second 
  rudimental 
  vertebral 
  

   piece. 
  It 
  presents 
  a 
  rudimental 
  capitulum 
  towards 
  the 
  latter. 
  

  

  Behind 
  this 
  piece 
  a 
  narrow 
  transverse 
  groove 
  extends 
  outwardly, 
  and 
  is 
  bounded 
  by 
  a 
  longer 
  groove 
  anteriorly 
  

   and 
  a 
  short 
  one 
  posteriorly. 
  Near 
  the 
  distal 
  extremity 
  of 
  the 
  bone 
  is 
  a 
  thickening, 
  which 
  terminates 
  abruptly 
  round 
  

   an 
  ovate 
  posterior 
  margin. 
  Its 
  anterior 
  margin 
  is 
  on 
  the 
  posterior 
  edge 
  of 
  the 
  preceding 
  costal 
  bone. 
  The 
  distal 
  

   margin 
  sends 
  a 
  short 
  process 
  downwards. 
  

  

  The 
  penultimate 
  is 
  characterized 
  by 
  the 
  high 
  crest 
  a 
  little 
  in 
  front 
  of 
  its 
  posterior 
  margin, 
  proxinially. 
  which 
  

   encloses 
  in 
  front 
  the 
  iliac 
  pit. 
  The 
  crest 
  continues 
  distally, 
  and 
  turning 
  abruptly 
  encloses 
  the 
  extremity 
  of 
  the 
  pit. 
  

  

  The 
  external 
  margin 
  of 
  the 
  last 
  costal 
  is 
  strongly 
  angulate; 
  the 
  penultimate 
  less 
  so. 
  As 
  in 
  all 
  of 
  our 
  Pleurodira, 
  

   the 
  marginal 
  sutures 
  are 
  half 
  squamosal, 
  and 
  with 
  striiform 
  ridges. 
  

  

  The 
  external 
  sculpture 
  is 
  coarsely 
  reticulate, 
  tending 
  to 
  enclose 
  areas 
  longitudinal 
  with 
  the 
  costals 
  towards 
  their 
  

   middle 
  and 
  distal 
  portions. 
  That 
  of 
  the 
  marginal 
  bones 
  is 
  closer. 
  The 
  dermal 
  scuta 
  are 
  separated 
  by 
  sutures 
  indis- 
  

   tinctly 
  marked 
  on 
  the 
  carapace 
  in 
  all 
  the 
  species 
  of 
  our 
  Pleurodira. 
  In 
  this 
  species 
  the 
  vertebrate 
  are 
  very 
  broad. 
  

  

  