﻿MACHAEROroES 
  EOTHEN 
  MATTHEW 
  GAZIN 
  345 
  

  

  roides 
  eotheii 
  are 
  the 
  atlas, 
  axis 
  (badly 
  crushed), 
  and 
  three 
  others 
  

   including 
  the 
  seventh. 
  The 
  transverse 
  processes 
  are 
  not 
  complete 
  

   on 
  the 
  atlas, 
  but 
  sufficient 
  remains 
  to 
  show 
  that 
  the 
  groove 
  or 
  

   notch 
  at 
  the 
  anterior 
  extremity 
  for 
  the 
  anterior 
  course 
  of 
  the 
  

   vertebral 
  artery 
  and 
  the 
  inferior 
  branch 
  of 
  the 
  spinal 
  nerve 
  is 
  

   not 
  covered 
  but 
  widely 
  open 
  as 
  in 
  Thinocyon. 
  The 
  posterior 
  open- 
  

   ing 
  of 
  the 
  vertebrarterial 
  foramen, 
  however, 
  is 
  distinctly 
  on 
  the 
  

   posterior 
  border 
  of 
  the 
  transverse 
  process, 
  not 
  dorsal 
  to 
  it 
  as 
  

   described 
  by 
  Matthew 
  for 
  Thinocyon. 
  

  

  The 
  two 
  intermediate 
  cervicals 
  between 
  the 
  axis 
  and 
  the 
  sev- 
  

   enth 
  show 
  a 
  well-developed 
  inferior 
  lamella 
  with 
  the 
  forward 
  

   ridge 
  well 
  separated 
  from 
  the 
  forward 
  extension 
  of 
  the 
  trans- 
  

   verse 
  process 
  by 
  the 
  opening 
  of 
  the 
  vertebrarterial 
  canal. 
  These 
  

   also 
  show 
  a 
  well-developed 
  forward 
  projecting 
  hyperapophysis 
  

   beginning 
  superior 
  to 
  the 
  postzygapophysis 
  and 
  extending 
  for- 
  

   ward 
  half 
  to 
  three-quarters 
  of 
  the 
  way 
  to 
  articular 
  surface 
  of 
  

   the 
  anterior 
  zygapophysis. 
  It 
  is 
  lower 
  than 
  the 
  spine 
  and 
  more 
  

   compressed 
  transversely. 
  

  

  The 
  first 
  eight 
  dorsal 
  vertebrae 
  were 
  found 
  in 
  articulation 
  with 
  

   the 
  last 
  cervical, 
  and 
  the 
  centra 
  of 
  seven 
  additional 
  vertebrae, 
  not 
  

   in 
  articulation, 
  were 
  preserved, 
  at 
  least 
  four 
  of 
  which 
  belong 
  to 
  

   the 
  lumbar 
  series. 
  The 
  anterior 
  dorsals 
  show 
  elongate 
  transverse 
  

   processes 
  for 
  articulation 
  with 
  the 
  ribs, 
  and 
  moderately 
  high 
  but 
  

   rapidly 
  tapering 
  spines. 
  The 
  spine 
  of 
  the 
  first 
  dorsal 
  appears 
  to 
  

   be 
  the 
  longest, 
  and 
  possibly 
  the 
  only 
  one 
  to 
  have 
  an 
  anteropos- 
  

   teriorly 
  expanded 
  tip. 
  The 
  centra 
  identified 
  as 
  lumbar 
  are 
  very 
  

   elongate, 
  dorsoventrally 
  flattened, 
  and 
  with 
  the 
  articular 
  faces 
  

   markedly 
  sloping, 
  downward 
  and 
  backward 
  with 
  respect 
  to 
  the 
  

   longitudinal 
  axis. 
  

  

  Limb 
  bonpfi 
  (pi. 
  46, 
  c-f) 
  . 
  — 
  The 
  humerus 
  of 
  Machaeroides 
  eothen 
  

   is 
  distinctly 
  larger 
  and 
  more 
  robust 
  than 
  in 
  Limnocyon 
  verus. 
  The 
  

   deltoid 
  and 
  ectocondylar 
  ridges 
  are 
  wide 
  and 
  flaring, 
  and 
  both 
  ex- 
  

   tend 
  for 
  a 
  greater 
  proportion 
  of 
  the 
  length 
  of 
  the 
  shaft 
  than 
  in 
  L. 
  

   veiru?,. 
  The 
  development 
  of 
  the 
  deltoid 
  crest 
  together 
  with 
  the 
  high 
  

   and 
  widely 
  expanded 
  acromion 
  of 
  the 
  .scapula 
  furnisher 
  good 
  lever- 
  

   age 
  and 
  indicates 
  the 
  importance 
  of 
  the 
  deltoid 
  muscU'. 
  which 
  func- 
  

   tions 
  in 
  raising 
  the 
  arm 
  outward. 
  The 
  prominence 
  and 
  length 
  of 
  

   the 
  ectocondylar 
  ridge 
  denote 
  good 
  leverage 
  for 
  the 
  supinator 
  

   longus 
  in 
  flexing 
  and 
  supinating 
  the 
  forearm. 
  The 
  greater 
  and 
  

   lesser 
  tuberosities 
  are 
  well 
  developed 
  with 
  large 
  rugose 
  surfaces 
  

   for 
  the 
  muscles 
  used 
  in 
  rotating 
  the 
  humerus. 
  The 
  distal 
  end 
  of 
  the 
  

   humerus 
  exhibits 
  a 
  large, 
  oval 
  entepicondylar 
  foramen 
  and 
  well- 
  

   developed 
  condyles, 
  particularly 
  the 
  inner, 
  which 
  has 
  a 
  very 
  rugose 
  

  

  