﻿In. 
  

  

  Lin. 
  

  

  4. 
  

  

  9. 
  

  

  2. 
  

  

  8.5 
  

  

  3. 
  

  

  

  9. 
  

  

  11. 
  

  

  AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  43 
  

  

  CIMOLIASATTRUS 
  MAGNUS, 
  Leidy. 
  

  

  Pr. 
  A. 
  N. 
  8., 
  Plnla., 
  1851, 
  325, 
  1854, 
  72. 
  Cretaceous 
  Rept. 
  N. 
  A. 
  25, 
  tab. 
  00. 
  

  

  This 
  species 
  has 
  hitherto 
  been 
  known 
  from 
  vertebrae 
  only. 
  In 
  connection 
  with 
  vertebrae 
  of 
  this 
  species, 
  I 
  pro- 
  

   cured 
  a 
  long 
  bone 
  which 
  has 
  a 
  near 
  resemblance 
  to 
  the 
  femur 
  of 
  Plesiosaurus. 
  It 
  indicates 
  a 
  paddle 
  for 
  motion 
  in 
  the 
  

   water, 
  as 
  has 
  already 
  been 
  mentioned. 
  

  

  The 
  distal 
  breadth 
  is 
  equal 
  to 
  If 
  the 
  length. 
  It 
  is 
  distal 
  compressed, 
  but 
  thick 
  and 
  with 
  rounded 
  margins. 
  

   The 
  proximal 
  portion 
  is 
  slightly 
  reverted 
  to 
  the 
  condyle, 
  and 
  compressed 
  nearly 
  at 
  right 
  angles 
  to 
  the 
  clistal 
  extremity. 
  

   The 
  condyle 
  is 
  flattened 
  convex 
  and 
  oval 
  in 
  circumference. 
  The 
  tibial 
  and 
  fibular 
  articular 
  faces 
  form 
  a 
  strong 
  angle 
  

   with 
  each 
  other, 
  and 
  are 
  pitted 
  rugose 
  for 
  the 
  cartilaginous 
  articulation. 
  

  

  Distal 
  breadth, 
  

   Breadth 
  at 
  neck, 
  

   Diagonal 
  across 
  condyle. 
  

   Length, 
  

  

  It 
  is 
  seen, 
  therefore, 
  that 
  this 
  bone 
  is 
  remarkably 
  robust, 
  much 
  more 
  so 
  than 
  in 
  the 
  Plesiosauri 
  of 
  adult 
  age. 
  

   That 
  the 
  individual 
  to 
  which 
  it 
  pertained 
  is 
  not 
  mature, 
  appears 
  from 
  the 
  dorsals 
  accompanying, 
  in 
  which 
  the 
  neural 
  

   arch 
  is 
  not 
  fully 
  coossified 
  to 
  the 
  centrum. 
  We 
  can 
  regard 
  the 
  species 
  as 
  a 
  robust 
  and 
  powerful 
  animal, 
  in 
  which 
  bulk 
  

   is 
  more 
  prominent 
  than 
  length. 
  

  

  V 
  

  

  Anterior 
  dorsal, 
  length 
  centrum, 
  

  

  Width 
  do., 
  

  

  Depth 
  do., 
  

  

  Length 
  articulation 
  for 
  neurapophysis, 
  

  

  Width 
  do. 
  do., 
  

  

  The 
  centrum 
  is 
  much 
  constricted 
  medially 
  and 
  the 
  diapophyses 
  are 
  given 
  off 
  from 
  the 
  neurapophyses, 
  the 
  lower 
  

   margin 
  corresponding 
  with 
  that 
  of 
  the 
  bottom 
  of 
  the 
  neural 
  canal. 
  This 
  specimen 
  is 
  from 
  Barnesboro, 
  and 
  was 
  

   submitted 
  to 
  me 
  by 
  Prof. 
  Cook, 
  State 
  Geologist. 
  

  

  Locality: 
  the 
  Cretaceous 
  Green 
  Sand 
  of 
  New 
  Jersey; 
  upper 
  bed. 
  

  

  CIMOLIASAURUS 
  GRANDIS. 
  

  

  Brimosaurus 
  grandis, 
  Leidy, 
  Proceed. 
  Ac. 
  Nat. 
  Sci., 
  1854, 
  72; 
  tab. 
  I., 
  II. 
  

  

  From 
  Cretaceous 
  of 
  Clark 
  County, 
  Arkansas 
  (near 
  Greenville). 
  

  

  I 
  have 
  not 
  seen 
  any 
  part 
  of 
  this, 
  the 
  largest 
  species. 
  It 
  is, 
  from 
  Leidy's 
  figures 
  and 
  description, 
  distinguished 
  

   by 
  the 
  relatively 
  greater 
  width 
  and 
  height 
  of 
  its 
  vertebrae, 
  and 
  has 
  been 
  therefore 
  a 
  shorter 
  and 
  more 
  massive 
  animal 
  

   than 
  its 
  congeners. 
  As 
  nothing 
  beyond 
  Leidy's 
  description 
  is 
  known 
  of 
  it, 
  I 
  append 
  the 
  latter. 
  

  

  It 
  was 
  represented 
  by 
  vertebrae 
  from 
  near 
  Greenville, 
  Clark 
  County, 
  Arkansas. 
  They 
  had 
  been 
  kindly 
  loaned 
  by 
  

   W. 
  T. 
  Roberts, 
  an 
  agent 
  of 
  the 
  Arkansas 
  Mining 
  Company, 
  who 
  had 
  discovered 
  them 
  with 
  numerous 
  others. 
  Dr. 
  

   L. 
  stated 
  that, 
  in 
  his 
  visit 
  to 
  St. 
  Louis, 
  Mr. 
  Alb. 
  Koch, 
  the 
  industrious 
  collector 
  of 
  fossil 
  remains, 
  had 
  exhibited 
  to 
  

   him 
  a 
  collection 
  of 
  bones 
  from 
  the 
  same 
  State, 
  and 
  apparently 
  of 
  tlte 
  same 
  animal, 
  which 
  he 
  was 
  on 
  the 
  eve 
  of 
  

   sending 
  to 
  Berlin. 
  The 
  specimens 
  are 
  remarkable 
  for 
  the 
  robust 
  transverse 
  processess, 
  which 
  project 
  laterally 
  

   from 
  the 
  lower 
  part 
  of 
  the 
  body, 
  and 
  terminate 
  in 
  a 
  large 
  facet 
  for 
  the 
  articulation 
  of 
  a 
  rib. 
  The 
  bodies 
  are 
  

   cylindroid, 
  and 
  are 
  terminated 
  by 
  slightly 
  concave 
  or 
  nearly 
  flat 
  articular 
  surfaces. 
  The 
  sides 
  of 
  the 
  body 
  are 
  moder- 
  

   ately 
  concave, 
  and 
  have 
  an 
  acute 
  margin 
  at 
  the 
  articular 
  surfaces. 
  On 
  each 
  side 
  of 
  a 
  median 
  prominence 
  of 
  the 
  under 
  

   side 
  of 
  the 
  body 
  a 
  large 
  vascular 
  foramen 
  exists. 
  These 
  vertebrae 
  resemble 
  those 
  of 
  Cimoliasaurus 
  magnus 
  from 
  the 
  

  

  In. 
  

  

  Lin. 
  

  

  2, 
  

  

  5.1 
  

  

  3. 
  

  

  7. 
  

  

  2. 
  

  

  10. 
  

  

  1. 
  

  

  11. 
  

  

  1. 
  

  

  1. 
  

  

  