﻿194 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  ■ 
  

  

  talis, 
  is 
  much 
  smaller 
  and 
  with 
  coossified 
  chevron 
  hones; 
  it 
  is 
  without 
  diapophyses 
  and 
  is 
  hence 
  more 
  posterior 
  than 
  

   any 
  of 
  those 
  of 
  the 
  present 
  species 
  here 
  noted. 
  It 
  helongs 
  to 
  another 
  species, 
  hut 
  to 
  which 
  of 
  those 
  here 
  described, 
  if 
  

   to 
  any, 
  is 
  difficult 
  to 
  determine. 
  Dimensions 
  of 
  anterior 
  caudals 
  of 
  a 
  large 
  '? 
  M. 
  dekayi 
  from 
  the 
  same 
  position 
  as 
  

   those 
  of 
  M. 
  maximus, 
  measured 
  above: 
  

  

  Lines. 
  

   Length 
  of 
  centrum, 
  (anterior) 
  - 
  32 
  

  

  Width 
  articular 
  face, 
  * 
  34.5 
  

  

  Depth 
  " 
  39 
  

  

  Length 
  centrum 
  No. 
  2, 
  (a 
  little 
  behind) 
  33 
  

  

  Width 
  articular 
  ball, 
  38 
  

  

  Depth 
  " 
  " 
  37 
  

  

  A 
  portion 
  of 
  the 
  left 
  pterygoid 
  bone 
  of 
  the 
  Holmdel 
  specimen 
  above 
  mentioned, 
  exhibits 
  parts 
  and 
  wholes 
  of 
  five 
  

   alveolae, 
  and 
  two 
  teeth 
  in 
  place. 
  In 
  the 
  latter 
  the 
  inner 
  face 
  is 
  narrower 
  than 
  the 
  outer, 
  and 
  they 
  are 
  separated 
  in 
  

   the 
  posterior 
  tooth 
  by 
  a 
  strong 
  angulation. 
  The 
  small 
  proportions 
  of 
  crown 
  to 
  root, 
  as 
  well 
  as 
  other 
  details, 
  are 
  so 
  

   similar 
  to 
  those 
  of 
  the 
  teeth 
  described 
  by 
  Leidy 
  as 
  characteristic 
  of 
  his 
  Baneodon 
  reversus, 
  that 
  I 
  have 
  no 
  hesitation 
  

   in 
  referring 
  the 
  latter 
  as 
  pterygoid 
  teeth 
  of 
  a 
  large 
  individual 
  of 
  this 
  or 
  another 
  species. 
  The 
  teeth 
  are 
  of 
  equal 
  size, 
  

   thus 
  differing 
  from 
  those 
  of 
  Liodon 
  mitchillii, 
  and 
  are 
  much 
  smaller 
  in 
  relation 
  to 
  the 
  maxillary 
  teeth 
  than 
  in 
  the 
  

   same. 
  

  

  Lines. 
  

   Length 
  of 
  whole 
  tooth, 
  pterygoid, 
  17 
  

  

  Diameter 
  fang, 
  " 
  8.5 
  

  

  " 
  crown, 
  " 
  4.5 
  

  

  " 
  " 
  maxillary, 
  10.5 
  

  

  " 
  fang, 
  " 
  s 
  16. 
  

  

  The 
  pterygoids 
  are 
  in 
  a 
  groove 
  without 
  alveolar 
  septa. 
  

  

  In 
  addition 
  to 
  the 
  characters 
  already 
  pointed 
  out, 
  this 
  species 
  differs 
  from 
  the 
  M. 
  missuriensis 
  as 
  follows, 
  judging 
  

   from 
  the 
  figures 
  and 
  descriptions 
  of 
  Goldfuss. 
  

  

  In 
  M. 
  dekayi 
  the 
  prootic 
  wraps 
  over 
  the 
  opisthotic 
  to 
  its 
  superior 
  face; 
  in 
  M. 
  missuriensis 
  the 
  exoccipital 
  wraps 
  

   over 
  to 
  the 
  superior 
  face 
  of 
  the 
  same 
  bone. 
  

  

  In 
  missuriensis 
  the 
  squamosal 
  forms 
  a 
  horizontal 
  three-cornered 
  expansion 
  and 
  only 
  touches 
  the 
  opisthotic 
  behind. 
  

  

  In 
  M. 
  dekayi 
  the 
  squamosal 
  is 
  largely 
  inferior 
  and 
  has 
  no 
  superior 
  expansion. 
  

  

  In 
  M. 
  dekayi 
  the 
  under 
  face 
  of 
  suspensorium 
  is 
  underwrapped 
  by 
  prootic, 
  by 
  the 
  exoccipital 
  in 
  missuriensis. 
  

   Glenoid 
  cavity 
  two-thirds 
  on 
  squamosal 
  in 
  M. 
  dekayi; 
  not 
  at 
  all 
  on 
  squamosal 
  in 
  M. 
  missuriensis. 
  

  

  Lower 
  (? 
  upper) 
  marl 
  bed 
  of 
  upper 
  cretaceous 
  of 
  New 
  Jersey. 
  

  

  MOSASAURUS 
  FTJLCIATUS, 
  Cope. 
  

   Spec. 
  n'ov. 
  

  

  This 
  species 
  is 
  represented 
  by 
  an 
  os 
  quadratum, 
  three 
  posterior 
  dorsal 
  vertebrae, 
  and 
  an 
  

  

  imperfect 
  humerus, 
  obtained 
  by 
  Prof. 
  Geo. 
  H. 
  Cook, 
  from 
  the 
  Green 
  Sand 
  of 
  Monmouth 
  

  

  Co., 
  N. 
  J. 
  

  

  The 
  vertebrae 
  are 
  those 
  in 
  which 
  the 
  diapophyses 
  spring 
  from 
  the 
  middle 
  of 
  the 
  centrum, 
  one 
  being 
  quite 
  flat- 
  

   tened, 
  and 
  the 
  other 
  triangular 
  in 
  section. 
  The^entrum 
  is 
  convex 
  below 
  them; 
  the 
  articular 
  faces 
  nearly 
  round. 
  

  

  The 
  prominent 
  peculiarity 
  is 
  seen 
  in 
  the 
  os 
  quadratum. 
  The 
  ala 
  is 
  broken 
  off. 
  The 
  external 
  angle 
  is 
  consider- 
  

   ably 
  smaller 
  than 
  in 
  M. 
  dekayi, 
  though 
  not 
  more 
  so 
  than 
  usual 
  variation 
  would 
  allow. 
  The 
  knob 
  is»very 
  promi- 
  

   nent, 
  and 
  is 
  separated 
  by 
  a 
  deep 
  groove 
  from 
  an 
  elevated 
  ridge, 
  which 
  extends 
  from 
  the 
  pit 
  and 
  terminates 
  in 
  a 
  

   rugose'prominence 
  representing 
  the 
  process 
  in 
  M. 
  maximus 
  ; 
  (see 
  plate 
  xi, 
  f. 
  7). 
  Anterior 
  to 
  this, 
  another 
  ridge 
  

   arises 
  from 
  the 
  rugose 
  muscular 
  insertion 
  and 
  extends 
  to 
  the 
  extremity 
  of 
  the 
  bone 
  diverging 
  from 
  the 
  first 
  men- 
  

   tioned 
  ridge, 
  constituting 
  the 
  external 
  distal 
  ridge; 
  the 
  space 
  between 
  these 
  ridges 
  is 
  filled 
  up, 
  and 
  the 
  section 
  across 
  

   them 
  is 
  that 
  of 
  a 
  prominent 
  rectangular 
  buttress; 
  a 
  wide 
  concavity 
  separates 
  it 
  from 
  the 
  external 
  surface 
  of 
  the 
  ala. 
  

  

  