﻿In. 
  

  

  Lin. 
  

  

  2 
  

  

  0.5 
  

  

  1 
  

  

  6. 
  

  

  1 
  

  

  1.5 
  

  

  3 
  

  

  0.5 
  

  

  

  10.5 
  

  

  

  9 
  

  

  

  4.5 
  

  

  

  15. 
  

  

  

  5.5 
  

  

  AND 
  AYES 
  OF 
  NORTH 
  AMERICA. 
  221 
  

  

  Length 
  of 
  centrum 
  below, 
  

   Width 
  of 
  cup, 
  

   Depth 
  " 
  " 
  

  

  Width 
  between 
  extremities 
  diapophysis, 
  

   Depth 
  articular 
  face 
  diapophyses, 
  

   From 
  diapoph. 
  to 
  end 
  zygapophysis, 
  

   Between 
  zygosphen 
  and 
  zygapophysis, 
  

   Width 
  centrum 
  anterior 
  to 
  ball, 
  

   " 
  of 
  neural 
  canal 
  behind, 
  

  

  This 
  vertebra 
  indicates 
  a 
  formidable 
  snake-like 
  animal, 
  which 
  paddled 
  and 
  sculled 
  in 
  the 
  Cretaceous 
  Ocean, 
  or 
  

   perhaps 
  wandered 
  more 
  or 
  less 
  on 
  land. 
  Its 
  length 
  by 
  comparison 
  with 
  the 
  C. 
  propython 
  was 
  probably 
  thirty 
  

   feet. 
  

  

  From 
  the 
  lower 
  bed 
  of 
  Cretaceous 
  Green 
  Sand 
  at 
  Swedesboro, 
  N. 
  J. 
  Discovered 
  by 
  Professor 
  O. 
  C. 
  Marsh, 
  of 
  

   Yale 
  College. 
  

  

  CLIDASTES 
  INTERMEDINS, 
  Leidy. 
  

  

  Proceed. 
  Acad. 
  Nat. 
  Sci., 
  January, 
  1870. 
  

  

  This 
  species 
  is 
  established 
  on 
  several 
  cervical 
  and 
  dorsal 
  vertebras, 
  with 
  portions 
  of 
  mandibular 
  rami 
  and 
  other 
  

   bones, 
  from 
  Alabama, 
  discovered 
  by 
  Dr 
  Nott, 
  of 
  Mobile. 
  

  

  They 
  indicate 
  a 
  species 
  intermediate 
  in 
  size 
  between 
  the 
  two 
  others 
  hei-e 
  described. 
  The 
  dorsal 
  vertebra? 
  are 
  

   rather 
  slender, 
  more 
  so 
  than 
  in 
  C. 
  iguanavus, 
  and 
  with 
  articular 
  faces 
  with 
  cup 
  and 
  ball 
  remarkably 
  oblique 
  to 
  the 
  

   axis 
  of 
  the 
  vertebra. 
  The 
  dense 
  layer 
  of 
  the 
  bone 
  is 
  thrown 
  into 
  numerous 
  rugosities 
  and 
  ridges, 
  as 
  in 
  C. 
  

   propython. 
  

  

  What 
  is 
  more 
  characteristic, 
  is 
  the 
  robust 
  and 
  even 
  swollen 
  form 
  of 
  the 
  crowns 
  of 
  the 
  teeth, 
  and 
  their 
  slightly 
  

   rugose 
  enamel 
  for 
  the 
  basal 
  three-fourths 
  the 
  height. 
  There 
  are 
  no 
  facets. 
  

  

  Rotten 
  Limestone 
  Upper 
  cretaceous, 
  of 
  Pickens 
  Co., 
  Alabama. 
  

  

  CLIDASTES 
  PROPYTHON, 
  Cope. 
  

  

  Bost. 
  Society, 
  Nat. 
  Hist. 
  Proceedings, 
  1869, 
  p. 
  258. 
  

  

  This 
  species 
  is 
  known 
  from 
  an 
  almost 
  complete 
  skeleton, 
  found 
  by 
  Dr. 
  Edward 
  R. 
  Showalter, 
  in 
  the 
  Rotten 
  Lime- 
  

   stown, 
  near 
  Uniontownin 
  Alabama. 
  

  

  Its 
  general 
  proportions 
  may 
  be 
  estimated 
  as 
  follows. 
  As 
  a 
  considerable 
  number 
  of 
  vertebra? 
  has 
  been 
  lost, 
  it 
  will 
  

   be 
  necessary 
  to 
  illustrate 
  it 
  in 
  some 
  points 
  from 
  Cuvier's 
  estimate 
  of 
  the 
  length 
  of 
  Mosasaurus 
  giganteus. 
  

  

  M. 
  giganteus. 
  C. 
  propython. 
  

  

  2 
  Atlas 
  and 
  Axis 
  2 
  

  

  11 
  Cervicals 
  with 
  hypapophysis, 
  6 
  

  

  Dorsals 
  with 
  zygapophyses 
  and 
  

   5 
  ribs, 
  15 
  

  

  At 
  least 
  to 
  be 
  added 
  to 
  this 
  

   series, 
  10 
  

  

  18 
  1 
  Total 
  33 
  

  

  2 
  Between 
  the 
  last 
  and 
  those 
  

   64 
  bearing 
  chevron 
  bones, 
  (estimated 
  

  

  for 
  C. 
  propython), 
  96 
  

  

  51 
  3 
  Caudals 
  with 
  chevron 
  bones, 
  60 
  

  

  133 
  Total, 
  189 
  

  

  AMERICA. 
  PHILO. 
  SOC. 
  — 
  VOL. 
  XIV. 
  56. 
  

  

  