﻿H. 
  G. 
  SEELEY 
  OX 
  NETJSTICOSAUEUS 
  PTTSILLTJS. 
  361 
  

  

  Fore 
  Limb. 
  

  

  On 
  the 
  left 
  side 
  the 
  fore 
  limb 
  is 
  fairly 
  well 
  preserved 
  (PL 
  XIII. 
  fig. 
  

   1), 
  though 
  the 
  carpal 
  bones 
  are 
  bnt 
  slightly 
  indicated, 
  and 
  the 
  pha- 
  

   langes 
  appear 
  to 
  be 
  somewhat 
  scattered. 
  On 
  the 
  right 
  side 
  the 
  

   humerus 
  is 
  gone, 
  apparently 
  through 
  bad 
  collecting, 
  since 
  there 
  is 
  the 
  

   cavity 
  in 
  which 
  the 
  bone 
  rested. 
  Ulna 
  and 
  radius 
  are 
  well 
  preserved 
  ; 
  

   but 
  there 
  is 
  only 
  one 
  phalange. 
  On 
  the 
  left 
  side 
  the 
  fore 
  limb 
  is 
  5 
  cm. 
  

   long. 
  The 
  humerus 
  has 
  the 
  shape 
  usual 
  with 
  that 
  bone 
  in 
  Plesiosaurus. 
  

   It 
  is 
  21 
  mm. 
  long, 
  4 
  mm. 
  wide 
  at 
  the 
  proximal 
  end, 
  3| 
  mm. 
  wide 
  

   in 
  the 
  middle 
  of 
  the 
  shaft, 
  and 
  7| 
  mm. 
  wide 
  at 
  the 
  distal 
  end. 
  

   The 
  proximal 
  part 
  of 
  the 
  shaft 
  is 
  cylindrical, 
  with 
  the 
  articular 
  end 
  

   rounded, 
  and 
  some 
  muscular 
  roughnesses 
  on 
  the 
  shaft 
  near 
  the 
  

   proximal 
  end. 
  The 
  lower 
  part 
  of 
  the 
  shaft 
  is 
  more 
  flattened 
  and 
  

   compressed 
  ; 
  near 
  the 
  distal 
  end 
  there 
  is 
  a 
  groove 
  or 
  foramen 
  for 
  a 
  

   vessel 
  towards 
  the 
  posterior 
  border, 
  as 
  in 
  Nothosaurus. 
  The 
  

   anterior 
  border, 
  in 
  its 
  upper 
  third, 
  exhibits 
  a 
  slight 
  angular 
  bend, 
  

   such 
  as 
  occurs 
  in 
  some 
  Liassic 
  Plesiosaurs, 
  and 
  is 
  paralleled 
  in 
  the 
  

   humerus 
  of 
  Nothosaurus. 
  The 
  outline 
  of 
  the 
  bone 
  between 
  this 
  angle 
  

   and 
  the 
  distal 
  end 
  is 
  very 
  slightly 
  concave. 
  The 
  posterior 
  outline 
  is 
  

   much 
  more 
  concave, 
  owing 
  to 
  the 
  distal 
  end 
  of 
  the 
  bone 
  being 
  

   expanded 
  posteriorly. 
  The 
  distal 
  articulation 
  is 
  without 
  facets, 
  and 
  

   is 
  convex 
  from 
  front 
  to 
  back. 
  The 
  ulna 
  and 
  radius 
  are 
  longer 
  and 
  

   more 
  slender 
  than 
  those 
  of 
  Plesiosaurs, 
  and 
  present 
  a 
  marked 
  trans- 
  

   ition 
  towards 
  these 
  bones 
  in 
  a 
  Crocodile, 
  though 
  in 
  shortness 
  the 
  

   forearm 
  rather 
  suggests 
  the 
  Chelonian 
  type. 
  There 
  can 
  be 
  no 
  doubt 
  

   about 
  the 
  nomenclature 
  of 
  the 
  bones, 
  since 
  they 
  are 
  in 
  situ 
  ; 
  but 
  

   from 
  the 
  form 
  alone 
  it 
  might 
  well 
  have 
  been 
  inferred 
  that 
  the 
  

   anterior 
  bone 
  was 
  the 
  ulna, 
  and 
  the 
  posterior 
  bone 
  the 
  radius. 
  The 
  

   radius 
  is 
  12 
  mm. 
  long. 
  It 
  is 
  imperfect 
  proximally, 
  on 
  the 
  left 
  side 
  ; 
  

   but 
  on 
  the 
  right 
  side 
  the 
  proximal 
  end 
  is 
  seen 
  to 
  be 
  somewhat 
  

   enlarged 
  and 
  bent 
  inward, 
  with 
  an 
  oblique 
  articular 
  facet 
  to 
  articu- 
  

   late 
  with 
  the 
  humerus 
  ; 
  its 
  distal 
  end 
  is 
  more 
  slender 
  ; 
  and 
  the 
  bone 
  

   all 
  together 
  resembles 
  a 
  crocodilian 
  ulna. 
  The 
  ulna 
  on 
  the 
  right 
  side, 
  

   where 
  best 
  preserved, 
  is 
  11 
  mm. 
  long. 
  It 
  is 
  also 
  wider 
  proximally 
  

   than 
  distally, 
  with 
  nearly 
  parallel 
  sides 
  ; 
  the 
  proximal 
  end 
  has 
  au 
  

   oblique 
  facet. 
  Below 
  the 
  ulna 
  are 
  two 
  small 
  carpal 
  bones 
  ; 
  but 
  

   there 
  appear 
  to 
  be 
  two 
  or 
  three 
  more 
  displaced 
  among 
  the 
  digits, 
  so 
  

   that 
  the 
  structure 
  of 
  the 
  carpus 
  is 
  unknown 
  ; 
  but 
  it 
  had 
  a 
  Plesio- 
  

   saurian 
  character. 
  

  

  The 
  number 
  of 
  digits 
  is 
  uncertain, 
  and 
  there 
  may 
  not 
  have 
  been 
  

   more 
  than 
  three. 
  Only 
  one 
  metacarpal 
  (5 
  mm. 
  long) 
  is 
  preserved 
  ; 
  

   and 
  there 
  are 
  two 
  short 
  conical 
  terminal 
  phalanges. 
  

  

  In 
  the 
  second 
  specimen 
  the 
  humeri 
  are 
  exposed, 
  so 
  that 
  the 
  right 
  

   shows 
  the 
  dorsal, 
  and 
  the 
  left 
  the 
  posterior 
  lateral 
  aspect. 
  The 
  left 
  

   bone 
  is 
  not 
  quite 
  perfect 
  distally, 
  and 
  is 
  fractured 
  in 
  three 
  places. 
  

   The 
  right 
  humerus 
  is 
  fully 
  18 
  mm. 
  long 
  ; 
  its 
  proximal 
  end 
  is 
  narrower 
  

   above 
  than 
  below, 
  and 
  is 
  thicker 
  than 
  wide 
  ; 
  the 
  distal 
  end 
  is 
  

   6 
  \ 
  mm. 
  wide 
  ; 
  the 
  anterior 
  margin 
  is 
  convex 
  in 
  outline 
  proximally, 
  

   concave 
  distally 
  ; 
  the 
  distal 
  end 
  does 
  not 
  appear 
  to 
  be 
  quite 
  so 
  much 
  

  

  