﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  147 
  

  

  Lines. 
  

   Depth 
  within 
  (clistally), 
  7. 
  

  

  Greatest 
  -width, 
  16.5 
  

  

  Width 
  at 
  emargination, 
  13.5 
  

  

  A 
  costal 
  bone 
  of 
  the 
  right 
  side, 
  with 
  its 
  external 
  portion 
  broken 
  a'way, 
  accompanied 
  the 
  above, 
  but 
  probably 
  does 
  

   not 
  belong 
  to 
  the 
  same 
  species. 
  It 
  is 
  thin, 
  and 
  the 
  head 
  of 
  the 
  rib 
  is 
  almost 
  cylindric. 
  The 
  surface 
  is 
  marked 
  with 
  

   delicate 
  vascular 
  grooves, 
  which 
  are 
  largely 
  parallel 
  to 
  each 
  other. 
  The 
  external 
  angle 
  of 
  a 
  vertebral 
  scute 
  falls 
  near 
  

   the 
  posterior 
  border 
  2.3 
  inches 
  from 
  the 
  vertebral 
  suture, 
  indicating 
  considerable 
  breadth. 
  The 
  angle 
  is 
  right. 
  The 
  

   anterior 
  outer 
  suture 
  is 
  slightly 
  concave, 
  and 
  begins 
  to 
  assume 
  a 
  nearly 
  longitudinal 
  direction 
  on 
  the 
  costal 
  suture 
  , 
  

   one 
  inch 
  from 
  the 
  vertebral. 
  

  

  Lines. 
  

  

  Width 
  of 
  bone, 
  23.5 
  

  

  Thickness 
  at 
  lateral 
  suture, 
  2.5 
  

  

  Longer 
  vertebral 
  suture, 
  14 
  

  

  The 
  specimen 
  indicating 
  this 
  species 
  was 
  found 
  near 
  Pemberton, 
  Burlington 
  Co., 
  N. 
  J., 
  and 
  was 
  presented 
  to 
  the 
  

   Museum 
  of 
  the 
  Academy 
  by 
  Dr. 
  Samuel 
  Ashhurst. 
  At 
  the 
  same 
  time 
  and 
  place 
  were 
  found 
  plates 
  and 
  a 
  broken 
  femur 
  

   of 
  correlative 
  size 
  of 
  a 
  large 
  individual 
  of 
  Prochonias 
  sulcatus; 
  the 
  latter 
  measured 
  18 
  lines 
  across 
  head, 
  and 
  16 
  across 
  

   condyles. 
  There 
  were 
  also 
  remains 
  of 
  Adocus, 
  Hyposaurus, 
  Holops, 
  and 
  Mosasaurus. 
  

  

  Prof. 
  Leidy 
  describes 
  (Cretaceous 
  Reptiles) 
  two 
  species 
  of 
  Marine 
  Turtles 
  — 
  Chelone 
  sopita, 
  and 
  Chelone 
  ornata. 
  

   There 
  is 
  no 
  evidence 
  that 
  the 
  mandible 
  herein 
  described 
  pertained 
  to 
  either 
  of 
  these 
  species, 
  and 
  the 
  identification 
  of 
  

   the 
  accompanying 
  marginal 
  bones 
  indicates 
  a 
  considerable 
  difference. 
  These 
  are 
  in 
  the 
  pi'esent 
  species 
  concave 
  be- 
  

   low, 
  in 
  the 
  P. 
  sopita 
  convex 
  or 
  plane. 
  In 
  L. 
  angusta 
  the 
  suture 
  of 
  the 
  dermal 
  scutes 
  marks 
  an 
  entrant 
  angle; 
  in 
  the 
  

   P. 
  sopita, 
  a 
  projecting 
  one. 
  The 
  same 
  bones 
  are 
  relatively 
  narrower 
  than 
  in 
  any 
  of 
  the 
  species 
  of 
  Osteopygis, 
  and 
  

   have 
  planer 
  margins, 
  and 
  round 
  pits. 
  Their 
  narrowness 
  suggests 
  that 
  the 
  extremital 
  marginals 
  may 
  have 
  been 
  still 
  

   less 
  united 
  with 
  the 
  disc 
  than 
  in 
  the 
  species 
  of 
  Propleura. 
  

  

  This 
  species 
  is 
  also 
  known 
  from 
  the 
  three 
  marginal 
  bones, 
  and 
  part 
  of 
  a 
  fourth, 
  described 
  and 
  figured 
  by 
  Dr. 
  

   Leidy, 
  as 
  above. 
  I 
  suppose 
  them 
  to 
  be 
  from 
  the 
  sixth 
  to 
  the 
  ninth 
  of 
  the 
  left 
  side, 
  inclusive. 
  The 
  animal 
  has 
  suffered 
  

   an 
  injury, 
  as 
  a 
  deep 
  notch 
  is 
  cut 
  in 
  the 
  margin 
  between 
  the 
  eighth 
  and 
  ninth, 
  and 
  another 
  just 
  behind 
  the 
  rib-pit 
  of 
  

   the 
  ninth. 
  

  

  The 
  species 
  differs 
  markedly 
  from 
  the 
  P. 
  sopita 
  in 
  the 
  flatness 
  and 
  slenderness 
  of 
  the 
  more 
  lateral 
  marginal 
  bones, 
  

   and 
  were 
  it 
  not 
  for 
  the 
  posterior 
  marginal 
  of 
  the 
  P. 
  angusta 
  preserved, 
  might 
  be 
  referred 
  to 
  that 
  tortoise. 
  The 
  inner 
  

   edge 
  of 
  the 
  seventh 
  is 
  not 
  so 
  deep 
  as 
  in 
  the 
  P. 
  sopita, 
  and 
  the 
  breadth 
  relatively 
  less; 
  the 
  same 
  is 
  true 
  of 
  the 
  sixth. 
  

   The 
  superior 
  edge 
  is 
  prolonged 
  but 
  little 
  beyond 
  the 
  inferior. 
  The 
  pits 
  for 
  the 
  costal 
  psgs 
  are 
  behind 
  the 
  line 
  of 
  the 
  

   posterior 
  two-fifths 
  of 
  the 
  length, 
  on 
  all 
  the 
  bones. 
  Pits 
  round 
  conic, 
  inner 
  edges 
  equal. 
  Margin 
  from 
  seventh 
  slightly 
  

   curved 
  up. 
  

  

  Lines. 
  

   Width 
  sixth, 
  18 
  

  

  Depth 
  " 
  on 
  inner 
  border, 
  10.5 
  

  

  " 
  seventh 
  " 
  " 
  9 
  

  

  Length 
  " 
  " 
  " 
  31.5 
  

  

  Width 
  " 
  (average, 
  -0.5 
  

  

  Width 
  of 
  eighth, 
  f 
  the 
  length. 
  

  

  From 
  the 
  upper 
  Cretaceous 
  Green 
  Sand 
  Bed, 
  Mullica 
  Hill, 
  Gloucester 
  Co., 
  N. 
  J. 
  

  

  EITCLASTES. 
  

  

  Cope, 
  Proceedings 
  Academy 
  Nat. 
  Sciences, 
  1867, 
  p. 
  39. 
  

  

  