﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  122-A 
  

  

  TRIASSIC 
  DINOSAURIA. 
  

  

  CLEPSYSAURUS, 
  Lea. 
  

   CLEPSYSAURUS 
  PENNSYLVANICUS, 
  Lea. 
  

  

  Journ. 
  Ac. 
  Nat. 
  Science, 
  Phila., 
  II., 
  185, 
  Tab. 
  Emmons' 
  N. 
  Amer. 
  Geol. 
  p. 
  G7 
  (in 
  part). 
  

  

  This 
  species 
  is 
  a 
  Dinosaurian, 
  as 
  demonstrated 
  by 
  an 
  ischium 
  which 
  I 
  found 
  among 
  the 
  original 
  specimens, 
  and 
  

   which 
  resembles 
  in 
  some 
  degree 
  that 
  of 
  Lselaps 
  and 
  Megadactylus. 
  The 
  genus 
  appears 
  to 
  be 
  closely 
  allied 
  to 
  Palseo- 
  

   saurus. 
  It 
  was 
  probably 
  a 
  "bird-track" 
  maker. 
  The 
  remains 
  from 
  North 
  Carolina 
  referred 
  to 
  it 
  by 
  Emmons, 
  belong 
  

   in 
  large 
  part 
  to 
  a 
  Belodont 
  reptile. 
  

  

  Triassic 
  Sandstones, 
  Lehigh 
  County, 
  Pa.; 
  Phoenixville, 
  Pa.; 
  Triassic 
  Coal 
  Measures, 
  Chatham 
  Co., 
  N. 
  Carolina. 
  

  

  MEGADACTYLUS, 
  Hitchcock. 
  

   Supplement 
  to 
  the 
  Ichnology 
  of 
  New 
  England, 
  p. 
  39, 
  1865. 
  

  

  This 
  genus 
  is 
  indicated 
  by 
  remains 
  in 
  a 
  more 
  or 
  less 
  fragmentary 
  condition, 
  from 
  the 
  

   red 
  sandstone 
  rocks 
  of 
  the 
  Valley 
  of 
  the 
  Connecticut, 
  from 
  the 
  neighborhood 
  of 
  Spring- 
  

   field, 
  Massachusetts. 
  They 
  were 
  found 
  by 
  William 
  Smith, 
  while 
  engaged 
  in 
  superintend- 
  

   ing 
  some 
  excavations 
  made 
  at 
  the 
  armory, 
  which 
  required 
  blasting. 
  

  

  The 
  remains 
  consist 
  of 
  four 
  caudal, 
  and 
  one 
  dorsal 
  vertebrae, 
  the 
  greater 
  part 
  of 
  the 
  

   left 
  fore 
  foot 
  with 
  distal 
  portions 
  of 
  ulnar 
  and 
  radius 
  ; 
  the 
  greater 
  part 
  of 
  the 
  left 
  femur, 
  

   proximal 
  end 
  of 
  left 
  tibia, 
  greater 
  part 
  of 
  left 
  fibula, 
  tarsus 
  and 
  hind 
  foot, 
  including 
  a 
  tar- 
  

   sal 
  bone, 
  perfect 
  metatarsus, 
  proximal 
  end 
  of 
  a 
  second 
  metatarsus, 
  parts 
  of 
  the 
  distal 
  end 
  

   of 
  a 
  third, 
  and 
  parts 
  and 
  impressions 
  of 
  four 
  phalanges. 
  Also, 
  the 
  greater 
  part 
  of 
  both 
  ischia. 
  

  

  These 
  fragments 
  demonstrate 
  the 
  former 
  existence 
  in 
  the 
  region 
  in 
  question, 
  of 
  a 
  form 
  

   of 
  the 
  Dinosauria, 
  not 
  far 
  removed 
  in 
  some 
  points 
  from 
  the 
  Palaeosaurus 
  of 
  the 
  English 
  

   Trias. 
  Its 
  pertinence 
  to 
  the 
  Symphypoda 
  is 
  suggested 
  by 
  the 
  apparent 
  absence 
  of 
  the 
  

   calcaneum 
  ; 
  but 
  this 
  is 
  uncertain, 
  for 
  that 
  element 
  may 
  have 
  been 
  lost. 
  In 
  Compsognathus 
  

   the 
  additional 
  peculiarity 
  of 
  the 
  persistence 
  of 
  but 
  two 
  carpal 
  bones 
  is 
  presented, 
  which, 
  

   according 
  to 
  Gegenbaur, 
  should 
  correspond 
  with 
  those 
  of 
  the 
  first 
  row 
  of 
  ordinary 
  Reptilia, 
  

   while 
  those 
  of 
  the 
  second 
  have 
  disappeared. 
  In 
  Megadactylus 
  those 
  of 
  the 
  first 
  series 
  are 
  

   present, 
  viz: 
  the 
  radiale 
  and 
  probably 
  ulnare, 
  and 
  one 
  of 
  the 
  second 
  row, 
  very 
  much 
  re- 
  

   duced, 
  opposite 
  to 
  the 
  second 
  metacarpus. 
  There 
  is 
  space 
  for 
  a 
  second 
  one 
  of 
  the 
  second 
  

   series, 
  but 
  it 
  does 
  not 
  appear 
  in 
  the 
  matrix, 
  while 
  the 
  ulnare 
  is 
  probably 
  lost. 
  

  

  The 
  bird-like 
  tendencies 
  of 
  this 
  type 
  have 
  been 
  indicated 
  above, 
  and 
  the 
  very 
  ornithic 
  

   character 
  of 
  the 
  bones 
  of 
  the 
  present 
  form 
  is 
  also 
  very 
  marked. 
  The 
  walls 
  of 
  the 
  long 
  

   bones 
  are 
  very 
  thin, 
  in 
  some 
  places 
  near 
  their 
  extremities 
  almost 
  as 
  much 
  so 
  as 
  writing 
  

   paper. 
  The 
  vertebra? 
  and 
  ischia 
  present 
  the 
  same 
  thin 
  walls. 
  The 
  structure 
  of 
  these 
  

   walls 
  is 
  exceedingly 
  dense. 
  The 
  special 
  characters 
  are 
  as 
  follows 
  : 
  

  

  Vertebrae. 
  A 
  dorso-lumbar 
  is 
  much 
  compressed, 
  but 
  not 
  keeled 
  below 
  ; 
  the 
  articular 
  

   extremities 
  are 
  expanded, 
  and 
  their 
  faces 
  slightly 
  concave. 
  An 
  anterior 
  caudal 
  has 
  a 
  simi- 
  

  

  