﻿512 
  ME. 
  E. 
  LYDEKKEE 
  OX 
  CERT 
  AD? 
  CHELOXIAX 
  REMAIXS 
  

  

  the 
  normal 
  type. 
  Above 
  the 
  femoral 
  is 
  seen 
  the 
  commencement 
  of 
  

   a 
  third 
  lateral 
  shield, 
  which 
  may 
  be 
  correlated 
  with 
  the 
  abdominal. 
  

   On 
  the 
  inner 
  side 
  of 
  these 
  lateral 
  shields 
  are 
  portions 
  of 
  two 
  larger 
  

   shields, 
  which 
  may 
  be 
  termed 
  interfemoral 
  and 
  interabdominal. 
  

   There 
  are 
  no 
  means 
  of 
  determining 
  whether 
  these 
  inner 
  shields 
  

   were 
  azygous 
  or 
  paired, 
  although 
  T 
  am 
  inclined 
  to 
  think 
  that 
  they 
  

   were 
  probably 
  azygous. 
  On 
  the 
  dorsal 
  surface 
  of 
  the 
  specimen 
  the 
  

   absence 
  of 
  any 
  pelvic 
  attachment 
  to 
  the 
  xiphiplastral 
  indicates 
  that 
  

   the 
  Chelonian 
  under 
  consideration 
  was 
  allied 
  to 
  the 
  Cryptodiran 
  

   section. 
  

  

  The 
  next 
  specimens 
  are 
  two 
  examples 
  of 
  bones 
  which 
  are 
  pro- 
  

   visionally 
  regarded 
  as 
  left 
  hyoplastrals, 
  one 
  of 
  which 
  (Xo. 
  3532) 
  is 
  

   represented 
  in 
  fig. 
  2, 
  while 
  the 
  other 
  (Xo. 
  3533) 
  is 
  figured 
  in 
  lEan- 
  

   tell's 
  ' 
  Fossils 
  of 
  Tilgate 
  Forest,' 
  pi. 
  vii. 
  fig. 
  3. 
  Anteriorly 
  they 
  

   exhibit 
  surfaces 
  which 
  are 
  assumed 
  to 
  be 
  for 
  the 
  articulation 
  of 
  the 
  

   epi- 
  and 
  entoplastrals 
  ; 
  while 
  posteriorly 
  there 
  is 
  an 
  entire 
  natural 
  

   surface 
  which 
  appears 
  to 
  have 
  articulated 
  with 
  a 
  mesoplastral 
  ele- 
  

   ment, 
  since, 
  if 
  these 
  bones 
  be 
  rightly 
  determined, 
  it 
  is 
  quite 
  evident 
  

   that 
  they 
  took 
  no 
  part 
  in 
  the 
  formation 
  of 
  the 
  axillary 
  portion 
  of 
  

   the 
  bridge. 
  I 
  conclude, 
  therefore, 
  that 
  the 
  structure 
  of 
  the 
  plastron 
  

  

  Fig. 
  2. 
  — 
  Left 
  Hyoplastral 
  (?) 
  of 
  a 
  Chelonian; 
  from 
  the 
  Wealden 
  

   of 
  CucJcfieJd. 
  (§ 
  nat. 
  size.) 
  

  

  i.g., 
  intergular 
  shield 
  ; 
  hum., 
  humeral 
  do. 
  ; 
  pec, 
  pectoral 
  do. 
  ; 
  i.pcc, 
  inter- 
  

   pectoral 
  do. 
  

  

  was 
  probably 
  of 
  the 
  same 
  general 
  type 
  as 
  in 
  Sternothcerus, 
  where 
  

   the 
  hypoplastral 
  forms 
  the 
  inguinal, 
  and 
  the 
  mesoplastral 
  the 
  

   axillary 
  half 
  of 
  the 
  bridge. 
  The 
  whole 
  plastron 
  must, 
  however, 
  

   have 
  been 
  much 
  longer 
  and 
  narrower 
  than 
  in 
  that 
  genus, 
  in 
  which 
  

   respect 
  Chelodina 
  makes 
  the 
  nearest 
  approach 
  among 
  existing 
  types. 
  

   Both 
  specimens 
  exhibit 
  an 
  inner 
  and 
  an 
  outer 
  row 
  of 
  epidermal 
  

   shields, 
  which 
  affords 
  the 
  ground 
  of 
  reference 
  to 
  the 
  same 
  form 
  as 
  

   the 
  preceding 
  specimen. 
  The 
  two 
  outer 
  shields 
  I 
  correlate 
  with 
  the 
  

   humeral 
  and 
  pectoral 
  ; 
  while 
  the 
  uppermost 
  of 
  the 
  inner 
  row 
  

   appears 
  to 
  represent 
  the 
  intergular 
  of 
  Chelodina^ 
  and 
  the 
  lower 
  

  

  