﻿* 
  AND 
  AVES 
  OF 
  -NORTH 
  AMERICA. 
  189 
  

  

  meatal 
  knob, 
  and 
  median 
  posterior 
  ridge 
  both 
  large; 
  a 
  strong 
  distal 
  external 
  ridge, 
  

   embracing 
  with 
  latter, 
  an 
  elevated 
  rib, 
  to 
  the 
  pit. 
  1 
  Teeth. 
  Medium, 
  m. 
  fulciatus. 
  

   aaa 
  ? 
  Quadratum 
  ; 
  caudals 
  pentagonal 
  ; 
  

   Mandibular 
  teeth 
  twelve, 
  spaced, 
  (Owen); 
  smaller. 
  m. 
  gracilis. 
  

  

  II. 
  Centra 
  of 
  cervical, 
  dorsal, 
  and 
  lumbar 
  vertebrae, 
  transversely 
  oval. 
  

   a 
  Large 
  species 
  ; 
  the 
  centra 
  of 
  posterior 
  dorsals 
  not 
  keeled 
  from 
  diapophyses 
  to 
  the 
  

   cup. 
  

  

  P 
  An 
  external 
  alar 
  angle 
  from 
  distal 
  extremity 
  to 
  meatus; 
  

   Meatal 
  pit 
  within 
  meatus; 
  proximal 
  articular 
  face 
  little 
  curved, 
  with 
  long 
  and 
  narrow 
  

   branch 
  on 
  edge 
  of 
  convex 
  ala. 
  m. 
  depressus. 
  

  

  PP 
  No 
  ribs 
  on 
  the 
  external 
  face 
  of 
  the 
  ala 
  of 
  the 
  quadrate 
  ; 
  

   Vertebrae 
  but 
  slightly 
  transverse 
  ; 
  quadrate 
  with 
  small 
  alar 
  and 
  angular 
  articular 
  

   surface 
  ; 
  meatal 
  pit 
  external 
  ; 
  knob 
  very 
  large, 
  separated 
  by 
  a 
  deep 
  groove 
  from 
  very 
  

   prominent 
  median 
  posterior 
  ridge 
  ; 
  external 
  distal 
  longitudinal 
  ridge 
  rudimental 
  or 
  want- 
  

   ing 
  ; 
  large. 
  m. 
  oarthrus. 
  

  

  Mandibular 
  teeth 
  fourteen 
  ; 
  pterygoid 
  ten 
  ; 
  squamosal 
  with 
  broad 
  triangular 
  expan- 
  

   sion 
  above 
  opisthotic. 
  Quadrate 
  bone 
  longer 
  than 
  broad. 
  Dorsals 
  transversely 
  ovate, 
  

   sides 
  rounded. 
  m. 
  missuriensis. 
  

  

  «« 
  Large 
  species, 
  the 
  dorsals 
  flattened, 
  with 
  lateral 
  keel 
  on 
  side 
  ; 
  

   Diapophyses 
  in 
  front 
  of 
  middle 
  of 
  centrum 
  ; 
  m. 
  brumbyi. 
  

  

  aaa 
  Small 
  species 
  with 
  depressed 
  centra. 
  

   Centra 
  transversely 
  ovate 
  ; 
  caudals 
  vertical 
  ovate 
  ; 
  M. 
  minor. 
  

  

  MOSASAURUS 
  MAXIMUS, 
  Cope. 
  

   Proceed. 
  Bost. 
  Soc. 
  Nat. 
  Hist., 
  1869, 
  263. 
  

  

  A 
  portion 
  of 
  an 
  individual 
  from 
  the 
  lower 
  green 
  sand 
  bed 
  of 
  Monmouth 
  Co., 
  N. 
  J., 
  has 
  been 
  submitted 
  to 
  

   me 
  by 
  the 
  Director 
  of 
  the 
  Geological 
  Survey 
  of 
  the 
  State, 
  Prof. 
  Geo. 
  H. 
  Cook- 
  

  

  It 
  consists 
  of 
  a 
  nearly 
  perfect 
  os 
  quadratum, 
  several 
  dorsal 
  and 
  cervical 
  vertebra?, 
  including 
  axis 
  and 
  atlas, 
  

   with 
  numerous 
  elements 
  which 
  have 
  been 
  scattered 
  and 
  have 
  not 
  yet 
  come 
  into 
  my 
  hands. 
  The 
  remains 
  indicate 
  

   an 
  animal 
  of 
  the 
  largest 
  size. 
  

  

  The 
  quadrate 
  bone 
  compared 
  with 
  those 
  of 
  two 
  other 
  species 
  from 
  the 
  New 
  Jersey 
  Green 
  Sand 
  presents 
  marked 
  

   characters. 
  Four 
  quadrate 
  bones 
  of 
  the 
  M. 
  dekayi 
  exhibit 
  such 
  constancy 
  in 
  the 
  form, 
  as 
  was 
  to 
  have 
  been 
  antici- 
  

   pated, 
  while 
  in 
  the 
  M. 
  maximus 
  and 
  M. 
  mitchillii, 
  it 
  is 
  an 
  obtuse 
  angle 
  and 
  that 
  over 
  the 
  ala 
  a 
  process, 
  which 
  is 
  very 
  

   large 
  in 
  the 
  former, 
  and 
  small 
  in 
  the 
  latter. 
  The 
  knob 
  just 
  within 
  the 
  meatus 
  of 
  the 
  ear 
  is 
  very 
  prominent 
  in 
  the 
  M. 
  

   dejyressus 
  and 
  M. 
  dekayi, 
  while 
  it 
  is 
  rudimental 
  in 
  M. 
  maximus: 
  in 
  the 
  latter 
  the 
  outer 
  ridge 
  bounding 
  the 
  meatus 
  is 
  

  

  * 
  MOSASAURUS 
  GIGANTEUS, 
  Soemmering. 
  

   Lacerta 
  gigantea, 
  Soemmering. 
  Momsaurus 
  Tioffmanii, 
  Mantell. 
  Mcamperi, 
  Meyer. 
  M. 
  beZgicus, 
  Hall. 
  

   Upper 
  cretaceous 
  Belgium, 
  Rhine 
  Prussia 
  and 
  England. 
  

  

  MOSASAURUS 
  GRACILIS, 
  Owen. 
  

  

  British 
  Fossil 
  Reptiles 
  Tab. 
  

  

  Upper 
  cretaceous 
  England. 
  

  

  AMERICA. 
  PIIILO. 
  SOC. 
  — 
  VOL. 
  XIV. 
  48 
  

  

  