﻿206 
  H. 
  G. 
  SEEEEY 
  OK 
  MEK^NOSAXTKUS 
  LEEDS1I, 
  

  

  point 
  ; 
  the 
  bones 
  have 
  extended 
  further 
  backward 
  ; 
  but 
  at 
  the 
  point 
  

   where 
  fractured 
  they 
  would 
  have 
  measured 
  14 
  inches 
  from 
  side 
  to 
  

   side. 
  The 
  outermost 
  lateral 
  margin 
  is 
  flat, 
  concave 
  from 
  before 
  

   backward 
  in 
  a 
  continuous 
  sweep 
  ; 
  the 
  bones 
  are 
  convex 
  from 
  side 
  

   to 
  side, 
  and 
  considerably 
  compressed 
  towards 
  the 
  distal 
  end. 
  The 
  

   coracoids 
  have 
  no 
  anterior 
  articular 
  surfaces 
  in 
  the 
  median 
  line 
  of 
  

   the 
  body. 
  

  

  The 
  Scapula. 
  

  

  The 
  scapulae 
  are 
  of 
  a 
  form 
  distinct 
  from 
  that 
  seen 
  in 
  any 
  

   described 
  Plesiosaurian 
  genus. 
  They 
  are 
  imperfectly 
  preserved, 
  but 
  

   were 
  placed 
  inclined 
  inward 
  and 
  forward, 
  like 
  the 
  scapulae 
  of 
  Plesio- 
  

   saurus. 
  The 
  inferior 
  surface 
  is 
  flat 
  from 
  side 
  to 
  side, 
  and 
  concave 
  

   from 
  before 
  backward. 
  The 
  bone 
  is 
  four-sided, 
  comprising 
  two 
  

   posterior 
  portions 
  ; 
  the 
  articulation 
  for 
  the 
  coracoid 
  is 
  2| 
  inches 
  long, 
  

   and 
  the 
  humeral 
  surface 
  rather 
  more 
  than 
  2 
  inches 
  long 
  ; 
  the 
  

   diameter 
  of 
  the 
  bone 
  between 
  these 
  extremes 
  is 
  3| 
  inches 
  ; 
  its 
  

   extreme 
  length 
  as 
  preserved, 
  measured 
  from 
  the 
  junction 
  of 
  the 
  two 
  

   posterior 
  sides 
  to 
  the 
  junction 
  of 
  the 
  two 
  anterior 
  sides, 
  is 
  about 
  5 
  

   inches. 
  The 
  inner 
  margin, 
  forming 
  the 
  outer 
  part 
  of 
  what 
  would 
  

   usually 
  be 
  the 
  scapulo- 
  coracoid 
  foramen, 
  is 
  compressed 
  and 
  sharp, 
  

   and 
  concave, 
  so 
  as 
  to 
  continue 
  the 
  curve 
  of 
  the 
  front 
  border 
  of 
  the 
  

   coracoid 
  bone 
  ; 
  the 
  outer 
  margin 
  is 
  nearly 
  straight 
  and 
  sharp, 
  making 
  

   an 
  angle 
  with 
  a 
  part 
  of 
  the 
  bone, 
  which 
  is 
  prolonged 
  from 
  the 
  abdo- 
  

   minal 
  to 
  the 
  dorsal 
  part 
  of 
  the 
  body. 
  The 
  lateral 
  part 
  is 
  at 
  about 
  a 
  

   right 
  angle 
  with 
  the 
  inferior 
  surface. 
  Posteriorly 
  and 
  inferiorly 
  the 
  

   anterior 
  process 
  is 
  thickened 
  and 
  rounded, 
  the 
  ridge 
  being 
  prolonged 
  

   downward 
  and 
  outward 
  to 
  the 
  inner 
  and 
  anterior 
  humeral 
  margin. 
  

   The 
  surface 
  of 
  the 
  bone 
  between 
  this 
  ridge 
  and 
  the 
  scapulo-coracoid 
  

   . 
  foraminal 
  border 
  is 
  oblique, 
  looks 
  inward, 
  and 
  is 
  concave 
  in 
  each 
  

   direction. 
  The 
  anterior 
  portion 
  may 
  have 
  extended 
  much 
  further 
  

   forward, 
  being 
  exceedingly 
  thin 
  ; 
  but 
  its 
  form 
  is 
  such 
  as 
  to 
  suggest 
  

   that 
  no 
  clavicular 
  bones 
  or 
  interclavicle 
  existed, 
  and 
  that 
  the 
  bones 
  

   may 
  have 
  met 
  so 
  as 
  to 
  complete 
  the 
  one 
  large 
  foramen 
  which 
  they 
  

   indicate. 
  

  

  The 
  Pelvic 
  Bones. 
  

  

  All 
  the 
  pelvic 
  bones 
  are 
  preserved. 
  The 
  pubes 
  and 
  ischia 
  each 
  

   unite 
  to 
  form 
  more 
  marked 
  median 
  keels 
  than 
  that 
  formed 
  by 
  

   the 
  coracoids, 
  while 
  the 
  pubes 
  and 
  ischia 
  do 
  not 
  meet 
  each 
  other 
  in 
  

   the 
  antero-posterior 
  median 
  line, 
  as 
  in 
  Plesiosaurus, 
  so 
  as 
  to 
  form 
  

   two 
  foramina, 
  but 
  constitute 
  one 
  foramen, 
  8g 
  inches 
  from 
  side 
  to 
  side, 
  

   which 
  is 
  slightly 
  indented 
  by 
  the 
  forward 
  mesial 
  angular 
  margin 
  of 
  

   the 
  ischia 
  behind, 
  so 
  that 
  it 
  measures 
  3-|- 
  inches 
  from 
  back 
  to 
  front 
  

   in 
  the 
  median 
  line, 
  and 
  four 
  inches 
  from 
  back 
  to 
  front 
  where 
  longest, 
  

   midway 
  in 
  each 
  lateral 
  moiety. 
  

  

  Neither 
  ischium 
  is 
  perfectly 
  preserved 
  ; 
  and 
  each 
  bone 
  lies 
  entirely 
  

   behind 
  its 
  articular 
  junction 
  with 
  the 
  pubis. 
  This 
  line 
  of 
  union 
  is 
  

   transverse 
  and 
  looks 
  forward, 
  and 
  is 
  nearly 
  1| 
  inch 
  long, 
  while 
  

   the 
  articular 
  surface 
  for 
  the 
  femur 
  is 
  fully 
  2| 
  inches 
  long; 
  but 
  its 
  

  

  