﻿CHELOXIA 
  AND 
  A 
  TOOTH 
  OF 
  (?) 
  ORNITHOPSIS. 
  231 
  

  

  Bhinochelys 
  brachyreina, 
  n. 
  sp. 
  

  

  This 
  species 
  is 
  also 
  represented 
  by 
  several 
  imperfect 
  crania. 
  In 
  

   the 
  type 
  specimen 
  (PL 
  VIII. 
  figs. 
  3, 
  3 
  a) 
  it 
  will 
  be 
  seen 
  that 
  the 
  

   cranium 
  is 
  readily 
  distinguished 
  from 
  that 
  of 
  the 
  preceding 
  species 
  

   by 
  the 
  extremely 
  small 
  size 
  of 
  the 
  nasals, 
  in 
  which 
  the 
  width 
  exceeds 
  

   the 
  length, 
  and 
  by 
  the 
  very 
  large 
  dimensions 
  of 
  the 
  nares, 
  as 
  well 
  

   as 
  by 
  the 
  circumstance 
  that 
  the 
  prefrontals 
  enter 
  largely 
  into 
  the 
  for- 
  

   mation 
  of 
  the 
  nares. 
  This 
  form 
  should 
  perhaps 
  represent 
  a 
  distinct 
  

   genus. 
  

  

  Bhinochelys 
  Jessoni, 
  n. 
  sp. 
  

  

  The 
  almost 
  perfect 
  and 
  beautiful 
  specimen 
  shown 
  in 
  PI. 
  VIII. 
  

   figs. 
  6, 
  6a 
  indicates 
  a 
  sixth 
  species 
  characterized 
  as 
  follows: 
  — 
  The 
  

   skull 
  is 
  much 
  depressed, 
  and 
  the 
  beak 
  markedly 
  hooked 
  : 
  the 
  narial 
  

   aperture 
  is 
  small, 
  with 
  the 
  nasals 
  antero-posteriorly 
  elongated 
  and 
  

   narrowing 
  superiorly 
  ; 
  the 
  prefrontals 
  are 
  very 
  large, 
  almost 
  meet 
  in 
  

   the 
  middle 
  line 
  above 
  the 
  nares, 
  and 
  enter 
  to 
  a 
  small 
  extent 
  into 
  the 
  

   formation 
  of 
  the 
  nares 
  ; 
  while 
  the 
  frontals 
  are 
  very 
  short 
  and 
  wide. 
  

   The 
  parietals 
  are 
  also 
  much 
  wider 
  than 
  in 
  the 
  other 
  species. 
  This 
  

   skull 
  also 
  differs 
  by 
  the 
  strongly 
  marked 
  impressions 
  of 
  the 
  epidermal 
  

   shields 
  in 
  the 
  fronto-nasal 
  region, 
  which 
  are 
  liable 
  to 
  be 
  mistaken 
  

   for 
  the 
  sutures. 
  The 
  indistinctness 
  of 
  many 
  of 
  the 
  sutures 
  appa- 
  

   rently 
  shows 
  that 
  this 
  specimen 
  belongs 
  to 
  an 
  adult 
  individual, 
  and 
  

   consequently 
  that 
  the 
  species 
  was 
  of 
  smaller 
  size 
  than 
  either 
  of 
  the 
  

   preceding. 
  There 
  is 
  a 
  possibility 
  that 
  this 
  species 
  may 
  really 
  

   indicate 
  a 
  distinct 
  genus. 
  This 
  specimen 
  is 
  important 
  as 
  showing 
  

   that 
  the 
  squamosal, 
  if 
  not 
  actually 
  articulating 
  with 
  the 
  parietal, 
  

   was 
  at 
  all 
  events 
  closely 
  approximated 
  to 
  that 
  bone. 
  The 
  con- 
  

   formation 
  of 
  the 
  anterior 
  border 
  of 
  the 
  tympanic 
  ring 
  is 
  also 
  very 
  

   clearly 
  displayed. 
  

  

  2. 
  Chelonidce 
  from 
  the 
  Cambridge 
  Greensand 
  and 
  Gault. 
  

  

  Chelone 
  Jessoni, 
  n. 
  sp. 
  

  

  In 
  the 
  above-mentioned 
  ' 
  Index 
  " 
  no 
  mention 
  is 
  made 
  of 
  any 
  

   remains 
  from 
  the 
  Cambridge 
  Greensand 
  which 
  are 
  referred 
  to 
  the 
  

   family 
  Chelonidse, 
  and 
  it 
  is 
  therefore 
  of 
  some 
  interest 
  to 
  be 
  able 
  to 
  

   bring 
  forward 
  evidence 
  of 
  the 
  existence 
  of 
  apparently 
  two 
  genera 
  of 
  

   that 
  family 
  in 
  these 
  deposits. 
  Of 
  the 
  first 
  form 
  I 
  have 
  evidence 
  

   in 
  portions 
  of 
  the 
  skull 
  — 
  the 
  cranial 
  portion 
  being 
  from 
  the 
  Gault, 
  

   while 
  the 
  mandibles, 
  which 
  I 
  take 
  as 
  the 
  type, 
  are 
  from 
  the 
  Cam- 
  

   bridge 
  Greensand. 
  Of 
  the 
  cranium 
  the 
  British 
  Museum 
  possesses 
  

   the 
  palate 
  (No. 
  47209) 
  of 
  a 
  large 
  Chelonian 
  from 
  Folkestone, 
  which 
  

   appears 
  to 
  be 
  that 
  of 
  a 
  Turtle, 
  and 
  which 
  would 
  accord 
  in 
  relative 
  

   size 
  with 
  the 
  larger 
  of 
  the 
  undermentioned 
  lower 
  jaws. 
  This 
  palate 
  

   appears 
  to 
  have 
  been 
  ridged, 
  and 
  in 
  its 
  narrow 
  form 
  agrees 
  with 
  

   Chelone 
  rather 
  than 
  with 
  Thalassochelys. 
  Of 
  the 
  mandible 
  there 
  

   are 
  two 
  specimens 
  — 
  one 
  in 
  Mr. 
  lesson's 
  collection, 
  and 
  the 
  other 
  in 
  

   the 
  British 
  Museum 
  (No. 
  35186). 
  The 
  latter, 
  which 
  is 
  figured 
  in 
  

  

  