﻿52 
  

  

  ME. 
  It. 
  LYDEKKEB 
  OX 
  THE 
  REMAINS 
  AKD 
  AFFINITIES 
  

  

  of 
  the 
  posterior 
  portion. 
  These 
  coracoids 
  closely 
  resemble 
  the 
  cor- 
  

   responding 
  bone 
  of 
  Pliosaurus 
  Evansi 
  figured 
  on 
  p. 
  722 
  of 
  vol. 
  xxxiii. 
  

   of 
  the 
  Society's 
  ' 
  Journal,' 
  by 
  Professor 
  Seeley 
  *. 
  The 
  precise 
  con- 
  

   tour 
  of 
  the 
  scapulae 
  in 
  the 
  Bedford 
  specimen 
  cannot 
  be 
  deter- 
  

   mined, 
  and 
  this 
  deficiency 
  has 
  accordingly 
  been 
  supplemented 
  by 
  

   fig. 
  6, 
  which 
  is 
  taken 
  from 
  one 
  of 
  the 
  specimens 
  in 
  the 
  collection 
  of 
  

   Air. 
  Leeds. 
  It 
  will 
  be 
  seen 
  from 
  this 
  figure 
  that 
  the 
  ventral 
  plates 
  

   of 
  the 
  scapulae 
  were 
  separated 
  in 
  the 
  median 
  line 
  by 
  a 
  very 
  small 
  

   and 
  triangular 
  omosternum, 
  and 
  that 
  there 
  appears 
  to 
  have 
  been 
  no 
  

   median 
  bar 
  connecting 
  the 
  former 
  with 
  the 
  coracoids. 
  The 
  contour 
  

  

  Kff. 
  6. 
  

  

  Anterior 
  part 
  of 
  pectoral 
  girdle 
  of 
  Peloneustes 
  philarchus, 
  viewed 
  from 
  the 
  

   ventral 
  aspect, 
  am, 
  omosternum 
  ; 
  sc., 
  scapula; 
  p.cor.. 
  ventral 
  (precoracoidal) 
  

   plate 
  of 
  do. 
  (Keduced.) 
  

  

  of 
  the 
  entire 
  scapula 
  is 
  undistinguishable 
  from 
  that 
  of 
  the 
  corre- 
  

   sponding 
  bone, 
  commonly 
  and, 
  I 
  believe, 
  rightly 
  referred 
  to 
  Pliosaurns, 
  

   and 
  is 
  quite 
  distinct 
  from 
  that 
  of 
  Liassic 
  species 
  of 
  Plesiosaurus. 
  The 
  

   presence 
  of 
  the 
  omosternum 
  and 
  the 
  absence 
  of 
  the 
  median 
  bar 
  

   connecting 
  the 
  ventral 
  plate 
  of 
  the 
  scapulae 
  with 
  the 
  coracoids 
  

   widely 
  distinguishes 
  this 
  type 
  of 
  pectoral 
  girdle 
  from 
  that 
  occurring 
  

   in 
  those 
  Jurassic 
  and 
  Cretaceous 
  Sauropterygians 
  which 
  I 
  have 
  

   recently 
  proposed 
  t 
  to 
  include 
  in 
  the 
  genus 
  Cimoliosaui*us, 
  which 
  is 
  

   taken 
  to 
  embrace 
  both 
  Elasmosaurus 
  and 
  Polycotylus 
  of 
  Prof. 
  Cope, 
  

   and 
  Colymhosaurus 
  and 
  Murcenosaurus 
  of 
  Prof. 
  Seeley. 
  

  

  In 
  the 
  pelvic 
  girdle 
  there 
  remains 
  one 
  nearly 
  entire 
  pubis, 
  

   a 
  fragment 
  of 
  the 
  corresponding 
  bone 
  of 
  the 
  opposite 
  side, 
  and 
  the 
  

   acetabular 
  portion 
  and 
  a 
  large 
  part 
  of 
  the 
  outer 
  border 
  of 
  the 
  two 
  

   ischia. 
  In 
  regard 
  to 
  the 
  pubis 
  (fig. 
  7) 
  I 
  have 
  no 
  observation 
  to 
  make. 
  

   The 
  ischia 
  are 
  very 
  imperfect, 
  but 
  sufficient 
  remains 
  of 
  the 
  specimen, 
  

   shown 
  on 
  the 
  right 
  side 
  of 
  fig. 
  8, 
  to 
  indicate 
  the 
  general 
  contour, 
  

   which 
  is 
  well 
  shown 
  in 
  one 
  of 
  the 
  specimens 
  in 
  the 
  collection 
  of 
  

   Hr. 
  Leeds. 
  I 
  find 
  an 
  ischium 
  of 
  precisely 
  similar 
  type, 
  although 
  of 
  

   rather 
  larger 
  dimensions, 
  in 
  the 
  British 
  Museum 
  (Xo. 
  47325), 
  from 
  

   the 
  Kimeridge 
  Clay 
  of 
  Swindon, 
  which 
  has 
  been 
  introduced 
  on 
  the 
  

   left 
  side 
  of 
  figure 
  8, 
  although 
  it 
  is 
  probably 
  referable 
  to 
  a 
  distinct 
  

  

  * 
  Originally 
  regarded 
  as 
  an 
  ischium, 
  but 
  redetermined 
  in 
  the 
  Greol. 
  Mag. 
  

   decade 
  hi. 
  vol. 
  iv. 
  pp. 
  478-479 
  (1887). 
  _ 
  

   t 
  G-eol, 
  Mag. 
  decade 
  hi. 
  vol. 
  v. 
  p. 
  356. 
  

  

  