﻿G 
  SUPPLEMENT 
  TO 
  THE 
  EXTINCT 
  BATRACHIA 
  

  

  of 
  that 
  species 
  in 
  ■which 
  the 
  cranium 
  has 
  the 
  same 
  size, 
  the 
  median 
  pectoral 
  plate 
  is 
  narrower 
  and 
  more 
  prolonged 
  

   longitudinally, 
  and 
  exhibits 
  tubercles 
  and 
  a 
  few 
  ridges 
  near 
  the 
  circumference, 
  but 
  no 
  cross-like 
  figure. 
  

  

  Dedicated 
  to 
  Prof. 
  Alexander 
  Winchell 
  of 
  the 
  New 
  York 
  University, 
  at 
  Syracuse, 
  author 
  of 
  the 
  "Sketches 
  

   of 
  Creation," 
  etc. 
  

  

  PTYONIUS 
  PECTINATUS, 
  Cope. 
  

  

  Sauropleura 
  pectinata, 
  Cope, 
  Proceed. 
  Acad. 
  Nat. 
  Sci., 
  Phila., 
  1868, 
  218; 
  O'estocephalus 
  pectinatus, 
  Transac. 
  

   Amer. 
  Philos. 
  Soc, 
  1869, 
  XIV, 
  p. 
  20. 
  

  

  PTYONIUS 
  SERRULA, 
  Cope. 
  

  

  Proceed. 
  Amer. 
  Philos. 
  Soc, 
  1871, 
  p. 
  177. 
  {O'estocephalus 
  ) 
  

  

  Represented 
  especially 
  by 
  a 
  single 
  almost 
  complete 
  specimen, 
  and 
  perhaps 
  by 
  another 
  originally 
  referred 
  to 
  

   the 
  P. 
  pectinatus. 
  It 
  is 
  only 
  half 
  as 
  large 
  as 
  that 
  species, 
  but 
  displays 
  a 
  more 
  complex 
  sculpture 
  of 
  the 
  pectoral 
  

   shields, 
  indicating 
  that 
  it 
  is 
  not 
  immature. 
  The 
  tail 
  is 
  relatively 
  longer. 
  

  

  The 
  remains 
  of 
  the 
  head 
  indicate 
  a 
  trigonal 
  outline 
  ; 
  but 
  the 
  muzzle 
  is 
  lost. 
  The 
  pectoral 
  shields 
  are 
  narrow 
  

   and 
  elongate, 
  both 
  median 
  and 
  lateral 
  a 
  little 
  wider 
  behind. 
  The 
  median 
  has 
  a 
  considerable 
  smooth 
  anterior 
  pro- 
  

   longation. 
  Its 
  surface 
  is 
  near 
  the 
  middle 
  sharply 
  reticulate-ridged, 
  then 
  closely 
  radiate-ridged 
  to 
  the 
  margin. 
  The 
  

   lateral 
  shield 
  is 
  reticulate-ridged 
  behind 
  and 
  sends 
  out 
  radii, 
  those 
  on 
  the 
  anterior 
  part 
  sub-parallel. 
  The 
  triangular 
  

   haemal 
  spines 
  begin 
  far 
  forward; 
  with 
  the 
  neurals, 
  they 
  are 
  rather 
  elongate-deltoid 
  in 
  form 
  without 
  the 
  distinct 
  

   peduncle 
  seen 
  in 
  P. 
  pectinatus, 
  but 
  instead, 
  a 
  short 
  concave 
  or 
  cresent 
  shaped 
  base 
  from 
  the 
  concavity 
  of 
  which 
  the 
  

   sculpture 
  rises. 
  This 
  consists 
  of 
  ridges 
  which 
  extend 
  beyond 
  the 
  intermediate 
  spaces, 
  like 
  teeth. 
  Abdominal 
  rods 
  

   hair-like. 
  Ribs 
  distinct. 
  Remains 
  of 
  limbs 
  not 
  discernible. 
  

  

  In 
  the 
  second 
  specimen 
  alluded 
  to, 
  weak 
  limbs 
  are 
  seen 
  on 
  each 
  side 
  of 
  the 
  posterior 
  part 
  of 
  the 
  abdominal 
  

   cavity. 
  On 
  the 
  right 
  a 
  moderately 
  stout 
  femur 
  is 
  given 
  off, 
  which 
  is 
  followed 
  by 
  a 
  broken 
  tibia 
  and 
  fibula, 
  and 
  then 
  

   by 
  five 
  closely 
  appressed 
  metatarsals. 
  The 
  last 
  are 
  2—5 
  as 
  long 
  as 
  the 
  space 
  between 
  them 
  and 
  the 
  femur, 
  beyond 
  

   them 
  a 
  few 
  slender 
  phalanges 
  are 
  moderately 
  distinctly 
  defined. 
  The 
  tibia 
  is 
  more 
  distinct 
  on 
  the 
  left, 
  but 
  there 
  are 
  

   no 
  tarsus 
  nor 
  phalanges; 
  some 
  of 
  the 
  metatarsals 
  remain. 
  Length 
  of 
  limb 
  to 
  end 
  of 
  metatarsals 
  equal 
  to 
  five 
  juxtaposed 
  

   vertebrae 
  measured 
  along 
  the' 
  edge 
  of 
  the 
  neural 
  spines. 
  The 
  limb, 
  especially 
  the 
  foot, 
  is 
  slender. 
  In 
  this 
  specimen 
  

   there 
  are 
  ten 
  neural 
  spines 
  included 
  in 
  a 
  length 
  of 
  half 
  an 
  inch. 
  

  

  In 
  the 
  typical 
  specimen 
  twelve 
  neural 
  spines 
  are 
  included 
  in 
  a 
  half 
  inch. 
  The 
  dorsal 
  vertebrae 
  are 
  somewhat 
  

   dislocated 
  in 
  the 
  anterior 
  region, 
  nevertheless 
  it 
  appears 
  that 
  the 
  length 
  from 
  the 
  front 
  of 
  the 
  pectoral 
  shield 
  is 
  

   contained 
  twice 
  in 
  the 
  length 
  of 
  the 
  tail 
  ; 
  in 
  the 
  smallest 
  example 
  of 
  S. 
  pectinata, 
  it 
  enters 
  the 
  same 
  .75 
  of 
  a 
  time, 
  

   though 
  perhaps 
  a 
  very 
  little 
  should 
  be 
  added 
  for 
  the 
  missing 
  extremity. 
  

  

  M. 
  

   Length 
  of 
  type 
  from 
  anterior 
  edge 
  of 
  pectoral 
  shield, 
  0.085 
  

  

  Length 
  of 
  median 
  pectoral 
  plite, 
  0.006 
  

  

  Width 
  of 
  neural 
  and 
  haamal 
  spines 
  at 
  first 
  caudal 
  vertebra, 
  .0045 
  

  

  " 
  " 
  " 
  " 
  at 
  middle 
  of 
  tail, 
  .0040 
  

  

  OE3TOCEPHALU3, 
  Cope. 
  

  

  Proceed. 
  Acad. 
  Nat. 
  Sci. 
  , 
  Phila., 
  18G8, 
  p. 
  218. 
  Transac. 
  Amer. 
  Philos. 
  Soc, 
  XIV., 
  p. 
  1C. 
  Sauropleura, 
  pt. 
  

   Proceed. 
  Acad. 
  Nat. 
  Sci., 
  Philada., 
  1868, 
  p. 
  217. 
  Proceed. 
  Amer. 
  Philos. 
  Soc. 
  1871, 
  p. 
  41. 
  

  

  Another 
  genus 
  resembling 
  in 
  its' 
  fan-like 
  haemal 
  and 
  neural 
  spines 
  of 
  the 
  tail, 
  

   the 
  European 
  form 
  Urocordylus, 
  and 
  differing 
  from 
  it 
  as 
  JPtyonius 
  docs, 
  i. 
  e. 
  in 
  the 
  

   rod-like 
  abdominal 
  scales, 
  and 
  the 
  well 
  developed 
  ribs. 
  Its 
  form 
  is 
  long 
  and 
  snake- 
  

   like, 
  and 
  it 
  thus 
  resembles 
  OpMderpeton, 
  Huxl. 
  But 
  in 
  the 
  latter 
  there 
  are 
  no 
  limbs, 
  

  

  