﻿0. 
  C. 
  Marsh 
  — 
  Notice 
  of 
  New 
  Vertebrate 
  Fossils. 
  267 
  

  

  The 
  following 
  are 
  some 
  dimensions 
  of 
  portions 
  of 
  this 
  

   specimen 
  : 
  

  

  Length 
  of 
  horn-core 
  from 
  top 
  of 
  orbit 
  to 
  summit 
  27 
  inches. 
  

  

  Antero-posterior 
  diameter 
  of 
  same 
  horn-core 
  at 
  base. 
  8 
  " 
  

  

  Transverse 
  diameter 
  of 
  same 
  . 
  _ 
  _ 
  5 
  " 
  

  

  Length 
  of 
  squamosal 
  behind 
  exoccipital 
  groove 
  55 
  " 
  

  

  Greatest 
  width 
  15 
  " 
  

  

  Width 
  at 
  middle 
  9 
  

  

  These 
  interesting 
  specimens 
  were 
  also 
  found 
  in 
  the 
  Laramie 
  

   of 
  Wyoming 
  by 
  Mr. 
  J. 
  B. 
  Hatcher. 
  

  

  ASTCHISAURID^E. 
  

   Ammosaurus, 
  gen. 
  nov. 
  

  

  The 
  Yale 
  Museum 
  has 
  recently 
  secured 
  two 
  interesting 
  

   specimens 
  of 
  Dinosaurs 
  from 
  the 
  Triassic 
  sandstone 
  of 
  the 
  

   Connecticut 
  valley. 
  In 
  comparing 
  these 
  with 
  the 
  known 
  

   species 
  of 
  Anchisaiwus 
  from 
  this 
  formation, 
  the 
  fact 
  became 
  

   evident 
  that 
  among 
  them 
  are 
  two 
  well-marked 
  genera. 
  One 
  

   of 
  the 
  specimens, 
  which 
  is 
  described 
  below, 
  cannot 
  now 
  

   be 
  distinguished 
  generically 
  from 
  the 
  type 
  of 
  Anchisaurus, 
  

   while 
  the 
  one 
  described 
  by 
  the 
  writer 
  as 
  Anchisaurus 
  major 
  

   is 
  quite 
  distinct, 
  and 
  hence 
  & 
  new 
  genus 
  is 
  here 
  established 
  for 
  

   its 
  reception. 
  The 
  distinctive 
  characters 
  are 
  well 
  marked 
  in 
  

   the 
  pelvic 
  arch. 
  

  

  There 
  are 
  three 
  vertebrae 
  in 
  the 
  sacrum, 
  but 
  they 
  are 
  not 
  

   coossified 
  with 
  each 
  other, 
  being 
  free, 
  as 
  in 
  the 
  Crocodilia. 
  

   The 
  ilium 
  is 
  comparatively 
  small, 
  and 
  has 
  a 
  slender 
  pre-acetab- 
  

   ular 
  process. 
  The 
  pubes 
  are 
  broad, 
  elongate 
  plates, 
  perforate 
  

   above, 
  and 
  not 
  coossified 
  with 
  each 
  other. 
  In 
  form, 
  they 
  

   resemble 
  the 
  corresponding 
  bones 
  in 
  Zanclodon, 
  where, 
  how- 
  

   ever, 
  the 
  two 
  are 
  coossified, 
  and 
  imperforate. 
  The 
  ischia 
  meet 
  

   the 
  pubes 
  by 
  an 
  extensive 
  union. 
  Their 
  distal 
  ends 
  are 
  

   slender, 
  directed 
  backward, 
  and 
  closely 
  adapted 
  to 
  each 
  other. 
  

   This 
  species 
  may 
  now 
  be 
  known 
  as 
  Ammosaurus 
  major. 
  

  

  Anchisaiirus 
  colurus, 
  sp. 
  nov. 
  

  

  The 
  new 
  species 
  is 
  represented 
  by 
  perhaps 
  the 
  most 
  perfect 
  

   Triassic 
  Dinosaur 
  yet 
  discovered, 
  as 
  the 
  skull 
  and 
  greater 
  

   portion 
  of 
  the 
  skeleton 
  were 
  found 
  in 
  place, 
  and 
  in 
  fine 
  

   preservation. 
  It 
  is 
  smaller 
  than 
  the 
  specimen 
  above 
  described, 
  

   but 
  similar 
  in 
  its 
  general 
  proportions, 
  yet 
  the 
  two 
  may 
  be 
  

   readily 
  distinguished 
  by 
  the 
  pelvic 
  arch 
  and 
  posterior 
  limbs. 
  

   The 
  pubes 
  are 
  distinct 
  from 
  each 
  other, 
  imperforate 
  above, 
  

   and 
  the 
  distal 
  portions 
  are 
  only 
  moderately 
  expanded. 
  The 
  

   process 
  that 
  projects 
  backward 
  to 
  meet 
  the 
  ischium 
  is 
  slender, 
  

   and 
  the 
  face 
  for 
  union 
  with 
  that 
  bone 
  is 
  quite 
  small- 
  The 
  sacrum 
  

   and 
  ischia 
  resemble 
  those 
  of 
  Ammosaurus 
  above 
  described. 
  

  

  