﻿206 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  The 
  other 
  specimens 
  from 
  Monmouth 
  Co. 
  are 
  considerably 
  injured. 
  The 
  centrum 
  of 
  the 
  first 
  dorsal, 
  or 
  that 
  with 
  

   the 
  last 
  trace 
  of 
  the 
  hypapophysis, 
  measures 
  3.10 
  inches 
  in 
  length, 
  and 
  the 
  cup 
  2 
  inches 
  in 
  diameter. 
  The 
  surface 
  on 
  

   each 
  side 
  of 
  the 
  trace 
  of 
  hypapophysis 
  is 
  strongly 
  longitudinally 
  striate. 
  

  

  The 
  third 
  specimen 
  is 
  more 
  posterior 
  in 
  position 
  than 
  any 
  of 
  the 
  other 
  vertebrae 
  described, 
  and 
  more 
  compressed 
  

   in 
  certain 
  parts 
  of 
  the 
  surface. 
  

  

  It 
  is 
  an 
  anterior 
  dorsal, 
  being 
  without 
  hypapophysis, 
  having 
  strong 
  diapophyses, 
  and 
  strong 
  neurapophyses 
  which 
  

   I 
  suspect 
  to 
  have 
  borne 
  zygapophyses, 
  though 
  these 
  have 
  been 
  broken 
  off. 
  It 
  differs 
  from 
  those 
  of 
  Mosasaurus, 
  which 
  

   occupy 
  the 
  same 
  position, 
  in 
  its 
  greatly 
  compressed 
  elevated 
  form, 
  in 
  the 
  strength 
  of 
  the 
  neurapophyses, 
  in 
  the 
  longi- 
  

   tudinal 
  instead 
  of 
  vertical 
  diapophyses, 
  and 
  in 
  the 
  lack 
  of 
  connection 
  by 
  elevation 
  or 
  otherwise 
  between 
  the 
  diapophysis 
  

   and 
  base 
  of 
  neurapophysis. 
  

  

  The 
  form 
  of 
  the 
  articular 
  ball 
  is 
  a 
  vertical 
  oval 
  with 
  sub-parallel 
  sides, 
  and 
  a 
  deep 
  rounded 
  emargination 
  at 
  the 
  

   neural 
  canal. 
  The 
  centrum 
  is 
  much 
  contracted 
  immediately 
  in 
  advance 
  of 
  this, 
  and 
  the 
  outlines 
  above 
  the 
  diapophy- 
  

   ses 
  are 
  markedly 
  concave. 
  The 
  neurapophysis 
  rises 
  at 
  about 
  one-fourth 
  the 
  length 
  of 
  the 
  centrum 
  in 
  advance 
  of 
  the 
  

   ball. 
  The 
  diapophyses 
  have 
  ovate 
  bases 
  deeper 
  anteriorly, 
  and 
  are 
  situate 
  at 
  the 
  middle 
  of 
  the 
  depth 
  of 
  the 
  centrum 
  

   on 
  the 
  anterior 
  half. 
  The 
  cup 
  is 
  strongly 
  cordate, 
  having 
  an 
  open 
  concavity 
  at 
  the 
  neural 
  canal; 
  the 
  edges 
  are 
  thin. 
  

   The 
  inferior 
  surface 
  presents 
  a 
  narrow 
  plane, 
  concave 
  extero-posteriorly, 
  and 
  bounded 
  by 
  the 
  compressed 
  sides, 
  which 
  

   form 
  a 
  longitudinal 
  concavity 
  below 
  the 
  diapophyses. 
  

  

  In. 
  Lin. 
  

  

  Length 
  of 
  vertebra 
  below, 
  2 
  1 
  

  

  Width 
  in 
  median 
  plane 
  below, 
  7.3 
  

  

  Depth 
  of 
  cup, 
  greatest, 
  1 
  9 
  

  

  " 
  " 
  least, 
  1 
  7.5 
  

  

  " 
  ball, 
  1 
  7.5 
  

  

  Width 
  " 
  1 
  5.7 
  

  

  Length 
  basis 
  diapophysis, 
  13. 
  

  

  This 
  specimen 
  was 
  found 
  near 
  Medford, 
  N. 
  J., 
  in 
  the 
  second 
  green 
  sand 
  bed, 
  and 
  presented 
  to 
  the 
  writer 
  by 
  

   Charles 
  Braddock, 
  of 
  Haddonfield. 
  

  

  The 
  last 
  described 
  vertebra 
  is 
  erroneously 
  named 
  31. 
  validus 
  on 
  Plate 
  V. 
  

  

  LIODON 
  CONGROPS, 
  Cope. 
  

   Spec. 
  nov. 
  

  

  This 
  species 
  is 
  indicated 
  by 
  a 
  posterior 
  cervical 
  vertebra, 
  which 
  presents 
  so 
  many 
  characters 
  as 
  to 
  render 
  its 
  ex- 
  

   clusion 
  from 
  the 
  present 
  work 
  scarcely 
  proper. 
  In 
  size 
  it 
  bears 
  some 
  relation 
  to 
  the 
  Mosasaurus 
  minor, 
  Gibbes, 
  but 
  is 
  

   still 
  smaller, 
  and 
  is 
  separated 
  at 
  once 
  by 
  the 
  round 
  instead 
  of 
  depressed 
  articular 
  faces. 
  

  

  The 
  posterior 
  articular 
  face 
  is 
  the 
  round 
  one; 
  the 
  anterior 
  is 
  slightly 
  depressed, 
  and 
  opposite 
  the 
  diapophyses 
  and 
  

   neural 
  canal 
  slightly 
  flattened, 
  so 
  as 
  to 
  give 
  a 
  slightly 
  tri-lateral 
  superior 
  outline 
  to 
  the 
  cup. 
  It 
  is 
  not 
  excavated 
  above, 
  

   as 
  in 
  the 
  species 
  of 
  Clidastes. 
  The 
  hypapophysis 
  is 
  broken, 
  but 
  its 
  base 
  is 
  unusually 
  long 
  and 
  wide. 
  The 
  infero-an- 
  

   terior 
  limb 
  of 
  the 
  short 
  diapophysis 
  descends 
  to 
  the 
  edge 
  of 
  the 
  cup, 
  considerably 
  below 
  its 
  middle. 
  The 
  space 
  it 
  en- 
  

   closes 
  with 
  its 
  superior 
  ridge 
  which 
  extends 
  into 
  the 
  anterior 
  zygapophysis, 
  is 
  reticulate 
  striate. 
  The 
  whole 
  surface 
  

   below 
  is 
  minutely 
  striate; 
  the 
  striae 
  become 
  coarse 
  as 
  it 
  approaches 
  the 
  ball. 
  The 
  latter 
  is 
  surrounded 
  by 
  a 
  groove, 
  and 
  

   its 
  margin 
  projects 
  acutely 
  beyond 
  the 
  adjacent 
  surface 
  of 
  the 
  centrum. 
  The 
  latter 
  is 
  much 
  contracted 
  behind 
  the 
  

   ball, 
  and 
  the 
  faces 
  below 
  the 
  diapophyses 
  are 
  concave. 
  Bases 
  of 
  neurapophysis 
  striate. 
  Neural 
  arch 
  bi-oken 
  away 
  

   above. 
  Neural 
  canal 
  with 
  epapophysial 
  ridge. 
  

  

  Lines. 
  

  

  Length 
  centrum 
  with 
  ball, 
  21.8 
  

  

  " 
  " 
  to 
  " 
  18 
  

  

  " 
  " 
  " 
  hypapophysis, 
  5.8 
  

  

  Width 
  baee 
  hypapophysis, 
  5.5 
  

  

  