﻿OF 
  FIVE 
  GENERA 
  OF 
  MESOZOIC 
  REPTILES. 
  

  

  51 
  

  

  characters 
  must 
  be 
  sought 
  from 
  other 
  examples. 
  In 
  the 
  Cambridge 
  

   specimen 
  the 
  cervical 
  ribs 
  are 
  anchylosed 
  to 
  the 
  centra, 
  but 
  the 
  

   attachment 
  is 
  of 
  a 
  deep 
  and 
  subpyramidal 
  form, 
  quite 
  different 
  from 
  

   that 
  occurring 
  in 
  Jurassic 
  Sauropterygians 
  like 
  the 
  so-called 
  Plesio- 
  

   saurus 
  Manseli, 
  and 
  exhibits 
  indications 
  of 
  the 
  presence 
  of 
  double 
  

   costal 
  facets 
  in 
  the 
  young. 
  Such 
  double 
  costal 
  facets 
  are 
  shown 
  in 
  the 
  

   skeleton 
  of 
  two 
  immature 
  individuals 
  in 
  the 
  collection 
  of 
  Mr. 
  Leeds. 
  

   The 
  cervical 
  centra 
  are 
  short, 
  with 
  slightly 
  cupped 
  terminal 
  faces. 
  The 
  

   number 
  of 
  cervicals 
  in 
  one 
  of 
  the 
  specimens 
  in 
  the 
  latter 
  collection 
  

   is 
  21, 
  which 
  seems 
  to 
  indicate 
  that 
  some 
  are 
  missing 
  in 
  the 
  Cambridge 
  

   specimen. 
  The 
  dorsal 
  and 
  lumbar 
  vertebrae 
  do 
  not 
  afford 
  any 
  very 
  

   important 
  characters, 
  although 
  it 
  appears 
  that 
  the 
  neuro-central 
  

   suture 
  is 
  persistent. 
  Of 
  the 
  pectorals 
  or 
  lumbars 
  of 
  the 
  Bedford 
  

   specimen 
  an 
  imperfect 
  example 
  is 
  represented 
  in 
  PI. 
  II. 
  fig. 
  3, 
  while 
  

   the 
  centrum 
  of 
  a 
  caudal 
  is 
  shown 
  in 
  fig. 
  2 
  of 
  the 
  same 
  Plate, 
  the 
  

  

  Fig. 
  5. 
  

  

  Coracoids 
  of 
  Pebneustes 
  philarchus, 
  restored 
  and 
  reduced, 
  gl. 
  glenoid 
  facet. 
  

  

  sutural 
  union 
  of 
  the 
  arch 
  with 
  the 
  centrum 
  being 
  well 
  shown 
  in 
  the 
  

   former 
  figure. 
  

  

  When 
  the 
  specimen 
  came 
  to 
  the 
  Museum 
  the 
  pectoral 
  and 
  f 
  pelvic 
  

   girdles 
  were 
  in 
  a 
  multitude 
  of 
  fragments 
  : 
  but 
  with 
  great 
  patience 
  

   Mr. 
  Lingard, 
  one 
  of 
  the 
  Attendants 
  in 
  the 
  Geological 
  Department, 
  

   has 
  succeeded 
  in 
  joining 
  many 
  of 
  these 
  together, 
  so 
  that 
  the 
  general 
  

   plan 
  of 
  structure 
  can 
  be 
  determined. 
  In 
  the 
  pectoral 
  girdle 
  (in 
  

   which 
  I 
  follow, 
  in 
  the 
  main, 
  the 
  interpretation 
  of 
  the 
  component 
  

   bones 
  given 
  by 
  Mr. 
  Hulke 
  in 
  his 
  Presidential 
  Address 
  to 
  our 
  Society 
  

   in 
  1883) 
  considerable 
  portions 
  of 
  the 
  two 
  coracoids 
  and 
  scapulas 
  have 
  

   been 
  pieced 
  together. 
  The 
  former 
  are 
  placed 
  in 
  their 
  natural 
  position 
  

   in 
  the 
  accompanying 
  diagram 
  (fig. 
  5), 
  with 
  an 
  approximate 
  restoration 
  

  

  e2 
  

  

  