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  SUPPLEMENT 
  TO 
  THE 
  EXTINCT 
  BATPACHIA 
  

  

  Group 
  IV. 
  Ambulatory 
  limbs 
  and 
  unossified 
  vertebral 
  column 
  : 
  Colosteus, 
  Am- 
  

   phibamus. 
  

  

  Group 
  "V. 
  Vertebral 
  column 
  osseous, 
  the 
  branchial 
  hyoid 
  bones 
  well 
  developed: 
  

   Cocytinus. 
  

  

  The 
  locality 
  from 
  which 
  these 
  fossils 
  were 
  procured 
  is 
  near 
  Linton, 
  Columbiana 
  

   County, 
  near 
  YelloAV 
  Creek, 
  and 
  is 
  thus 
  near 
  the 
  Pennsylvania 
  State 
  line, 
  and 
  the 
  

   Ohio 
  River. 
  They 
  occur 
  in 
  a 
  small 
  basin 
  near 
  the 
  middle 
  of 
  the 
  series, 
  in 
  the 
  lower 
  

   part 
  of 
  the 
  " 
  diamond 
  bed," 
  which 
  is 
  eight 
  feet 
  in 
  thickness, 
  on 
  the 
  slate 
  which 
  is 
  in 
  

   contract 
  with 
  the 
  lower 
  three 
  to 
  six 
  inches 
  of 
  the 
  seam, 
  which 
  is 
  cannel 
  coal. 
  

  

  It 
  is 
  to 
  be 
  observed 
  that 
  the 
  specimens 
  are, 
  in 
  some 
  cases, 
  quite 
  obscure, 
  and 
  

   although 
  little 
  or 
  nothing 
  of 
  a 
  doubtful 
  nature 
  has 
  been 
  introduced 
  into 
  the 
  following 
  

   descriptions, 
  yet 
  the 
  elements 
  are 
  sometimes 
  covered 
  by 
  a 
  thin 
  layer 
  of 
  carbonaceous 
  

   matter, 
  which 
  prevents 
  their 
  entire 
  definition. 
  

  

  PHLEGETHONTIA, 
  Cope. 
  

   Proceed. 
  Amer. 
  Philos. 
  Soc., 
  1871, 
  177. 
  

  

  This 
  is 
  one 
  of 
  the 
  most 
  interesting 
  genera 
  of 
  the 
  present 
  series. 
  It 
  rests 
  chiefly 
  

   on 
  a 
  single 
  specimen 
  of 
  one 
  species, 
  which 
  is 
  not 
  perfect, 
  but 
  which 
  displays 
  the 
  fol- 
  

   lowing 
  character. 
  

  

  Head 
  elongate 
  triangular 
  ; 
  body 
  and 
  tail 
  extremely 
  elongate, 
  the 
  dorsal 
  vertebras 
  

   without 
  ribs, 
  and 
  the 
  caudals 
  without 
  dilated 
  spines. 
  !N~o 
  ventral 
  armature 
  nor 
  limbs. 
  

  

  As 
  a 
  great 
  portion 
  of 
  the 
  length 
  ig 
  preserved 
  and 
  no 
  ventral 
  rods 
  nor 
  scales 
  are 
  

   visible, 
  and 
  as 
  this 
  character 
  is 
  confirmed 
  by 
  a 
  second 
  species, 
  it 
  probably 
  belongs 
  

   truly 
  to 
  the 
  genus. 
  The 
  pectoral 
  shield 
  is 
  also 
  wanting 
  in 
  the 
  specimen, 
  but, 
  as 
  there 
  

   is 
  a 
  considerable 
  hiatus 
  behind 
  the 
  skull 
  of 
  the 
  specimen, 
  it 
  may 
  be 
  that 
  these 
  were 
  

   lost 
  with 
  other 
  parts. 
  Chevron 
  bones 
  are 
  not 
  observable 
  on 
  the 
  caudal 
  vertebras. 
  

   This 
  form 
  is 
  a 
  true 
  batrachian 
  snake. 
  

  

  PHLEGETHONTIA 
  LINEAEIS, 
  Cope. 
  Sp. 
  Nov. 
  

  

  In 
  the 
  only 
  specimen, 
  the 
  dorsal 
  vertebrae 
  are 
  much 
  involved 
  anteriorly, 
  so 
  that 
  the 
  length 
  is 
  not 
  readily 
  ascer- 
  

   tained. 
  The 
  entire 
  outline 
  of 
  the 
  skull 
  is 
  preserved 
  ; 
  it 
  is 
  elongate 
  triangular 
  in 
  form, 
  with 
  the 
  angles 
  of 
  the 
  man- 
  

   dibles 
  produced 
  backward 
  and 
  the 
  outlines 
  of 
  the 
  rami 
  a 
  little 
  convex. 
  Nothing 
  definite 
  remains 
  as 
  to 
  sculpture 
  or 
  

   dentition. 
  The 
  vertebrae 
  have 
  longitudinal 
  diapophysial 
  keels, 
  and 
  have 
  a 
  zigzag 
  interlocking 
  of 
  neural 
  arches, 
  

   probably 
  by 
  an 
  external 
  zygosphen 
  above 
  the 
  zygapophyses. 
  The 
  latter 
  are 
  distinctly 
  turned 
  outwards. 
  The 
  ver- 
  

   tebra; 
  are 
  very 
  numerous, 
  and 
  the 
  tail 
  very 
  attenuated. 
  The 
  total 
  length 
  of 
  the 
  coils 
  unwound 
  is 
  about 
  m 
  .295 
  or 
  11 
  

   in. 
  8 
  lines 
  ; 
  but 
  there 
  are 
  interruptions 
  not 
  measured, 
  and 
  some 
  confusion 
  not 
  unraveled. 
  The 
  number 
  of 
  dorsal 
  

   vertebrae 
  in 
  .005 
  m., 
  two 
  ; 
  of 
  distal 
  caudals, 
  three 
  and 
  a-half. 
  Length 
  of 
  cranium, 
  .022 
  ; 
  with 
  behind 
  .009. 
  Its 
  size 
  

   is 
  about 
  that 
  of 
  the 
  skull 
  of 
  Plyonhis 
  marshii, 
  Cope. 
  The 
  slenderuess 
  of 
  the 
  body 
  may 
  be 
  estimated 
  from 
  the 
  

   diameter 
  of 
  the 
  dorsal 
  vertebras, 
  m. 
  .0023 
  ; 
  and 
  of 
  the 
  caudals 
  .0014. 
  The 
  whole 
  number 
  of 
  vertebrae 
  preserved 
  

   is 
  fifty-six. 
  

  

  