﻿(5 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  STEGOCEPHALI. 
  

  

  Usual 
  cranial 
  elements 
  distinct, 
  including 
  frontals 
  and 
  pterygoids, 
  and 
  adding 
  "postor- 
  

  

  bitals 
  and 
  supertemporals." 
  

   Caudal 
  vertebrae'? 
  

   Orbitosphenoids 
  normal. 
  

   Inferior 
  pelvic 
  elements 
  distinct. 
  

  

  Mandible 
  dentigerous; 
  teeth 
  with 
  anchylosed 
  bases, 
  or 
  in 
  shallow 
  alveoli. 
  

   Ethmoid. 
  % 
  

   (A 
  quadratojugal.) 
  

  

  a 
  n 
  u 
  r 
  A 
  . 
  

  

  Frontal 
  and 
  parietal 
  confluent, 
  nasals 
  wanting 
  or 
  rudimental; 
  other 
  cranial 
  bones 
  present. 
  

   Postorbital, 
  supratemporal, 
  and 
  usually 
  nasals 
  wanting. 
  

   Ethmoid 
  an 
  annulus 
  (usually 
  complete 
  above) 
  surrounding 
  cerebral 
  lobes. 
  

   Caudal 
  vertebrae 
  represented 
  by 
  an 
  elongate 
  compound 
  style. 
  

  

  Inferior 
  elements 
  of 
  the 
  pelvis 
  consolidated 
  into 
  a 
  single 
  vertical 
  mass; 
  ilium 
  attached 
  

   immediately 
  to 
  sacral 
  vertebrae. 
  

  

  STEGOCEPHALI. 
  

  

  XENORHACHIA. 
  

  

  The 
  vertebral 
  centra 
  not 
  ossified; 
  the 
  teeth 
  simple; 
  no 
  branchial 
  hyal 
  bones; 
  occipital 
  

   condyles. 
  

  

  MICROSAURIA. 
  

  

  Vertebral 
  centra 
  ossified; 
  no 
  branchial 
  hyoids; 
  teeth 
  simple 
  or 
  with 
  slightly 
  inflected 
  

   enamel 
  of 
  the 
  basis; 
  occipital 
  condyles. 
  

  

  GANOCEPHALA. 
  

  

  Vertebral 
  centra 
  cartilaginous; 
  branchial 
  hyoids 
  present; 
  teeth 
  with 
  inflected 
  enamel, 
  

   anchylosed 
  by 
  their 
  bases. 
  No 
  ossified 
  occipital 
  condyles. 
  

  

  