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  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  APPENDIX 
  TO 
  THE 
  REPTILIA. 
  

  

  (ROCODILll, 
  

  

  Bottosaurus, 
  Agass. 
  

  

  Bottosaurus 
  tuberculatus, 
  Cope, 
  Sp. 
  nov. 
  

  

  From 
  an 
  examination 
  of 
  additional 
  material, 
  I 
  am 
  disposed 
  to 
  believe 
  that 
  the 
  Bottosaurus, 
  described 
  under 
  the 
  

   head 
  of 
  B. 
  harlani, 
  at 
  page 
  65, 
  as 
  a 
  smaller 
  individual, 
  really 
  represents 
  a 
  different 
  species 
  which 
  I 
  name 
  above. 
  The 
  

   material 
  is 
  from 
  the 
  same 
  locality 
  as 
  the 
  above 
  specimen, 
  and 
  consists 
  of 
  twenty-seven 
  vertebrae 
  from 
  the 
  dorsal, 
  lum- 
  

   bar, 
  sacral 
  and 
  caudal 
  series, 
  with 
  large 
  portions 
  of 
  the 
  pelvis 
  and 
  both 
  hind 
  limbs, 
  including 
  two 
  perfect 
  femora; 
  

   also, 
  about 
  fifty 
  dermal 
  bones. 
  

  

  Cranium 
  and 
  teeth. 
  These 
  are 
  described 
  as 
  above. 
  The 
  acute, 
  conic 
  dental 
  crown, 
  which, 
  I 
  at 
  one 
  time 
  referred 
  

   to 
  the 
  position 
  of 
  canine 
  of 
  B. 
  harlani, 
  I 
  believe 
  to 
  indicate 
  the 
  specific 
  distinctness 
  of 
  the 
  present 
  animal. 
  The 
  

   specimen 
  of 
  the 
  latter 
  appears 
  to 
  be 
  mature, 
  as 
  one 
  half 
  the 
  neural 
  arches 
  of 
  the 
  vertebra? 
  are 
  coossified; 
  the 
  size 
  is, 
  

   therefore, 
  not 
  more 
  than 
  half 
  that 
  of 
  B. 
  harlani. 
  

  

  Vertebra. 
  A 
  prominent 
  character 
  to 
  be 
  noticed 
  is 
  that 
  none 
  of 
  the 
  dorsal 
  and 
  lumbar 
  series 
  has 
  compressed 
  

   centrum, 
  as 
  is 
  the 
  case 
  with 
  most 
  of 
  the 
  Holopes; 
  nor 
  have 
  any 
  of 
  the 
  posterior 
  dorsals 
  the 
  compression 
  seen 
  in 
  H. 
  

   obscurus. 
  Second, 
  the 
  centra 
  never 
  present 
  the 
  parallelogrammic 
  horizontal 
  section 
  seen 
  in 
  the 
  Holopes; 
  on 
  the 
  contrary, 
  

   they 
  are 
  much 
  contracted 
  just 
  in 
  front 
  of 
  the 
  articular 
  ball, 
  and 
  flare 
  out 
  regularly 
  laterally, 
  to 
  the 
  rirn 
  of 
  the 
  socket. 
  

   The 
  lip 
  of 
  the 
  cup 
  is 
  thin, 
  and 
  the 
  cup 
  inclines 
  to 
  narrow 
  downward, 
  especially 
  anteriorly. 
  This 
  is 
  owing 
  to 
  the 
  fact 
  that 
  

   the 
  inferior 
  median 
  line 
  becomes 
  pinched 
  or 
  narrowed 
  on 
  approaching 
  the 
  position 
  of 
  the 
  hypapophysis. 
  One 
  verte- 
  

   bra 
  with 
  the 
  latter 
  is 
  preserved; 
  the 
  process 
  is 
  broken 
  off, 
  but 
  had 
  a 
  small 
  basis, 
  

  

  

  Lines, 
  

  

  Width 
  cup 
  first 
  lumbar, 
  

  

  21.2 
  

  

  Depth 
  " 
  " 
  

  

  17 
  

  

  Length 
  centrum, 
  

  

  28.6 
  

  

  Width 
  neural 
  canal, 
  

  

  Antero-posterior 
  length 
  between 
  ends 
  of 
  

  

  zygapophyses, 
  

   Expanse 
  of 
  anterior 
  pair 
  of 
  do. 
  , 
  

  

  Lines. 
  

   7.4 
  

  

  34 
  

   45 
  

  

  Width 
  cup 
  fifth 
  dorsal, 
  

   Depth 
  " 
  " 
  

  

  Length 
  centrum 
  do., 
  

  

  20. 
  Width 
  neural 
  canal 
  6.8 
  

  

  16.5 
  Antero-posterior 
  spread 
  of 
  zygapophyses, 
  33.4 
  

  

  27 
  Expanse 
  of 
  anterior 
  do., 
  38.2 
  

  

  The 
  Femora 
  are 
  large 
  in 
  proportion 
  to 
  the 
  size 
  of 
  the 
  vertebrae. 
  The 
  head 
  exhibits 
  the 
  round 
  form 
  characteristic 
  of 
  

   Holops, 
  and 
  not 
  the 
  obliquity 
  of 
  Hyposaurus. 
  What 
  characterizes 
  it 
  is 
  the 
  great 
  prominence 
  of 
  the 
  ridge, 
  rudimental 
  

   in 
  the 
  latter, 
  which 
  represents 
  the 
  third 
  trochanter 
  of 
  Dinosauria. 
  This 
  prominence 
  is 
  increased 
  by 
  the 
  presence 
  both 
  

   anteriorly 
  and 
  posteriorly 
  of 
  a 
  strongly 
  marked 
  pit. 
  Another 
  marked 
  characteristic, 
  not 
  seen 
  in 
  other 
  genera, 
  is 
  the 
  

   truncation 
  of 
  the 
  posterior 
  margin 
  of 
  the 
  shaft 
  close 
  to 
  the 
  head, 
  down 
  to 
  nearly 
  opposite 
  the 
  third 
  trochanter; 
  the 
  

   surface 
  thus 
  produced 
  is 
  deeply 
  grooved. 
  Inside 
  of 
  the 
  head 
  roughly 
  grooved; 
  outside 
  flatter, 
  more 
  finely 
  grooved; 
  

   a 
  grooved 
  swell, 
  in 
  the 
  position 
  of 
  the 
  great 
  trochanter 
  of 
  other 
  forms. 
  The 
  shaft, 
  compared 
  with 
  the 
  Holopes 
  and 
  

   Hyposaurus, 
  figured 
  in 
  the 
  present 
  work 
  (PI. 
  IV.,) 
  is 
  shorter 
  and 
  more 
  curved. 
  The 
  condyles 
  are 
  wide, 
  with 
  narrow 
  

   posterior 
  prolongations 
  extending 
  on 
  each 
  side 
  of 
  a 
  wide 
  and 
  deep 
  popliteal 
  groove. 
  

  

  In. 
  Lin. 
  In. 
  Lin. 
  

  

  Length 
  of 
  right 
  femur, 
  10 
  8 
  Expanse 
  condyles. 
  2 
  8.6 
  

  

  Width 
  head, 
  2 
  9.8 
  Circumference 
  shaft 
  at 
  

  

  Length 
  to 
  3d 
  trochanter, 
  3 
  ■ 
  11-7 
  middle, 
  4 
  4. 
  

  

  The 
  tibia 
  is 
  stout 
  and 
  slightly 
  curved; 
  the 
  condyloid 
  extremity 
  presents 
  two 
  articular 
  surfaces 
  at 
  right 
  angles 
  to 
  

   one 
  another, 
  of 
  which 
  the 
  longer 
  is 
  contracted 
  in 
  respect 
  to 
  the 
  length 
  of 
  the 
  bone, 
  and 
  is 
  supported 
  by 
  a 
  thin 
  mar- 
  

   gin. 
  The 
  proximal 
  extremity 
  is 
  broken 
  from 
  that 
  of 
  one 
  side, 
  but 
  remains 
  with 
  a 
  part 
  of 
  the 
  shaft 
  of 
  the 
  other. 
  

  

  