﻿196 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  MOSASATJRUS 
  OARTHRUS, 
  Cope. 
  

   Spec. 
  nov. 
  

  

  This 
  species 
  is 
  indicated 
  by 
  fragments 
  of 
  the 
  jaws 
  and 
  teeth, 
  with 
  an 
  imperfect 
  quad- 
  

   rate 
  bone 
  and 
  vertebra? 
  of 
  one 
  individual, 
  and 
  vertebra? 
  and 
  jaws 
  of 
  a 
  second 
  and 
  larger, 
  

   from 
  the 
  green 
  sand 
  of 
  New 
  Jersey. 
  

  

  The 
  animal 
  as 
  indicated 
  by 
  the 
  above 
  specimens, 
  was 
  of 
  about 
  the 
  size 
  of 
  M. 
  giganteus, 
  perhaps 
  fifty-five 
  feet 
  in 
  

   length. 
  Its 
  transversely 
  oval 
  centra 
  ally 
  it 
  to 
  the 
  M. 
  depressus 
  and 
  M. 
  missuriensis. 
  The 
  quadrate 
  bone 
  distinguishes 
  

   it 
  from 
  the 
  former 
  of 
  these, 
  as 
  it 
  more 
  nearly 
  resembles 
  that 
  of 
  the 
  M. 
  dekayi. 
  

  

  The 
  depression 
  of 
  the 
  articular 
  surfaces 
  is 
  not 
  quite 
  so 
  great 
  as 
  in 
  the 
  M. 
  depressus. 
  The 
  diapophyses 
  of 
  the 
  cer- 
  

   vicals 
  have 
  much 
  antero-posterior 
  extent, 
  and 
  very 
  little 
  vertical. 
  The 
  hypapophyses 
  are 
  well 
  developed. 
  The 
  sur- 
  

   face 
  of 
  the 
  centrum 
  is 
  very 
  coarsely 
  striate 
  or 
  rugose 
  in 
  front 
  of 
  the 
  diapophyses; 
  the 
  posterior 
  portion 
  near 
  the 
  ball 
  

  

  is 
  longitudinally 
  striate. 
  

  

  Linen. 
  

  

  Length 
  centrum, 
  median 
  cervical, 
  «4.3 
  

  

  Diameter 
  cup, 
  transverse, 
  35.(5 
  

  

  " 
  " 
  vertical, 
  28.6 
  

  

  The 
  superior 
  rim 
  of 
  the 
  cup 
  is 
  excavated 
  openly, 
  by 
  the 
  neural 
  canal. 
  The 
  lateral 
  element 
  of 
  the 
  atlas 
  has 
  the 
  

   same 
  form 
  and 
  size 
  as 
  in 
  bhe 
  M. 
  dekayi. 
  The 
  left 
  os 
  quadratum 
  presents 
  several 
  peculiarities, 
  intermediate 
  perhaps 
  

   between 
  those 
  of 
  M. 
  dekayi 
  and 
  M. 
  depressus. 
  The 
  median 
  posterior 
  ridge 
  and 
  knob 
  are 
  so 
  prominent 
  as 
  to 
  include 
  

   between 
  them 
  a 
  deep 
  groove 
  which 
  commences 
  at 
  the 
  pit 
  and 
  expands 
  below, 
  ceasing 
  with 
  the 
  extremity 
  of 
  the 
  ridge. 
  

   The 
  latter 
  terminates 
  rather 
  abruptly, 
  somewhat 
  as 
  in 
  M. 
  maximus, 
  but 
  is 
  not 
  truncate, 
  terminating 
  in 
  an 
  oblique 
  

   keel. 
  From 
  the 
  knob 
  downwards 
  the 
  bone 
  is 
  longer 
  than 
  in 
  M. 
  dekayi, 
  and 
  the 
  outer 
  distal 
  longitudinal 
  ridge 
  so 
  

   marked 
  in 
  that 
  species, 
  is 
  either 
  very 
  short 
  or 
  wanting. 
  The 
  inferior 
  extremity 
  of 
  the 
  angle 
  being 
  broken 
  away, 
  its 
  

   absence 
  cannot 
  be 
  asserted, 
  but 
  it 
  does 
  not 
  appear 
  at 
  a 
  point 
  considerably 
  below 
  its 
  origin 
  in 
  M. 
  dekayi. 
  In 
  the 
  lat- 
  

   ter 
  species 
  also, 
  the 
  median 
  posterior 
  ridge 
  is 
  very 
  small, 
  and 
  though 
  the 
  extremity 
  is 
  broken 
  off, 
  there 
  is 
  no 
  ridge 
  as 
  

   a 
  basis 
  for 
  the 
  prominence 
  seen 
  in 
  the 
  present 
  animal. 
  The 
  external 
  angle 
  of 
  the 
  proximal 
  extremity 
  is 
  not 
  as 
  promi- 
  

   nent 
  in 
  this 
  species 
  as 
  in 
  M. 
  dekayi. 
  

  

  In. 
  Lin. 
  

  

  Length 
  of 
  quadratum, 
  fi 
  3 
  

  

  " 
  to 
  knob, 
  (apex) 
  43.0 
  

  

  " 
  " 
  extremity 
  median 
  post, 
  ridge, 
  55.5 
  

  

  The 
  development 
  of 
  the 
  median 
  posterior 
  ridge 
  carried 
  a 
  little 
  further, 
  viz: 
  to 
  beyond 
  the 
  pit, 
  to 
  the 
  outer 
  side, 
  

   throwing 
  it 
  in 
  towards 
  the 
  meatus, 
  constitutes 
  the 
  peculiarity 
  of 
  this 
  element 
  in 
  Mos. 
  depressus. 
  

  

  The 
  crown 
  of 
  the 
  teeth 
  of 
  this 
  specimen 
  were 
  broken 
  away 
  when 
  I 
  obtained 
  them; 
  the 
  false 
  root 
  of 
  one 
  of 
  them 
  

   measures 
  eighteen 
  lines 
  in 
  diameter. 
  The 
  second 
  and 
  largest 
  specimen, 
  which 
  was 
  found 
  some 
  three 
  years 
  after- 
  

   wards, 
  was 
  not 
  more 
  fortunate, 
  as 
  the 
  workmen 
  broke 
  off 
  the 
  crowns 
  of 
  its 
  teetli 
  also. 
  

  

  This 
  species 
  was 
  found 
  at 
  the 
  base 
  of 
  the 
  upper 
  green-sand 
  bed 
  of 
  the 
  upper 
  creta- 
  

   ceous 
  of 
  New 
  Jersey, 
  near 
  Barnesboro, 
  Gloucester 
  Co. 
  It 
  was 
  discovered 
  by 
  my 
  friend, 
  

   I. 
  C. 
  Voorhees, 
  to 
  whom 
  I 
  am 
  indebted 
  for 
  the 
  type 
  specimens. 
  

  

  MOSASAURUS 
  DEPRESSUS, 
  Cope. 
  

  

  Geological 
  Survey 
  of 
  New 
  Jersey, 
  App. 
  C. 
  

  

  The 
  remains 
  characteristic 
  of 
  tins 
  species 
  consist 
  of 
  cervical, 
  dorsal, 
  and 
  luinbo-sacr.il 
  vertebrae, 
  and 
  some 
  pieces 
  

   of 
  the 
  cranium, 
  including 
  os 
  quadratum, 
  from 
  Burlington 
  Co.. 
  N. 
  J., 
  in 
  the 
  museum 
  of 
  (he 
  Academy, 
  from 
  Lewis 
  T. 
  

  

  