﻿174 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Reptilia.. 
  — 
  7 
  genera 
  and 
  44 
  species 
  are 
  distributed 
  through 
  the 
  

   Lias. 
  Numerically 
  they 
  are 
  — 
  

  

  Dimorphodon 
  1 
  species. 
  

  

  *Ichthyosaurus 
  11 
  

  

  Plesiosaurus 
  26 
  

  

  Scelidosaurus 
  1 
  

  

  Steneosaurus 
  1 
  

  

  Teleosaurus 
  3 
  

  

  Pterodactylus 
  1 
  

  

  44 
  species. 
  

  

  One 
  genus 
  {Ichthyosaurus) 
  and 
  11 
  species 
  of 
  the 
  order 
  Ichthyo- 
  

   pterygia 
  occur 
  in 
  the 
  Lias, 
  8 
  in 
  the 
  Lower, 
  4 
  of 
  these 
  in 
  the 
  Middle, 
  

   and 
  3 
  distinct 
  species 
  in 
  the 
  Upper 
  Lias. 
  The 
  latter 
  are 
  /. 
  longi- 
  

   rostris, 
  I. 
  crassimanus, 
  and 
  /. 
  zetlandicus, 
  the 
  last 
  2 
  being 
  of 
  huge 
  

   proportions 
  and 
  found 
  only 
  in 
  the 
  Upper 
  Lias 
  of 
  Whitby 
  associated 
  

   with 
  the 
  equally 
  gigantic 
  Sauropterygians 
  Plesiosaurus 
  Comptoni 
  

   and 
  P. 
  Cramptoni. 
  None 
  of 
  the 
  11 
  pass 
  to 
  higher 
  beds 
  ; 
  and 
  I 
  do 
  

   not 
  know 
  of 
  any 
  genus 
  or 
  species 
  occurring 
  in 
  either 
  the 
  Inferior 
  

   Oolite 
  or 
  the 
  Fuller's 
  Earth 
  in 
  Britain. 
  Plesiosaurus 
  (Sauropterygia) 
  

   is 
  illustrated 
  by 
  26 
  species 
  in 
  the 
  Lias, 
  18 
  of 
  which 
  are 
  Lower, 
  

   1 
  Middle, 
  and 
  Upper. 
  P. 
  brachycephalus 
  is 
  Lower 
  and 
  Upper, 
  and 
  

   P. 
  costatus 
  Lower 
  and 
  Middle. 
  

  

  Scelidosaurus. 
  — 
  This 
  remarkable 
  terrestrial 
  Dinosaur 
  has 
  occurred 
  

   as 
  yet 
  only 
  in 
  the 
  Lower 
  Lias 
  of 
  Charmouth, 
  near 
  Lyme 
  Regis. 
  It 
  

   was 
  described 
  by 
  Prof. 
  Owen 
  in 
  the 
  Palaeontographical 
  Society's 
  

   volume 
  for 
  1861-62, 
  and 
  shown 
  by 
  him 
  to 
  be 
  allied 
  to 
  Iguanodon. 
  

   It 
  is 
  believed 
  to 
  have 
  more 
  terrestrial 
  habits 
  than 
  any 
  previously 
  

   discovered 
  in 
  Liassic 
  deposits. 
  

  

  The 
  Crocodilian 
  genus 
  Steneosaurus, 
  belonging* 
  to 
  the 
  Mesosuchia 
  

   of 
  Huxley 
  and 
  allied 
  to 
  Teleosaurus, 
  3 
  species 
  of 
  Teleosaurus, 
  and 
  

   the 
  Pterosaurian 
  (Ornithosaurian) 
  genus 
  Pterodactylus 
  complete 
  

   the 
  list 
  of 
  Reptilian 
  genera 
  from 
  the 
  Lias. 
  Prof. 
  Sollas 
  has 
  added 
  to 
  

   our 
  knowledge 
  of 
  the 
  Sauropterygia, 
  through 
  his 
  description 
  of 
  a 
  new 
  

   species 
  {Plesiosaurus 
  Conybeari) 
  from 
  the 
  Lias 
  of 
  Charmouth, 
  and 
  

   his 
  observations 
  upon 
  P. 
  megacephalus, 
  Stutchb., 
  and 
  P. 
  brachyce- 
  

   phalus, 
  Owen. 
  A 
  most 
  valuable 
  synoptical 
  table 
  of 
  the 
  geogra- 
  

   phical 
  distribution 
  of 
  the 
  Plesiosaurs 
  is 
  appended 
  to 
  the 
  paper, 
  

   drawn 
  up 
  by 
  the 
  Rev. 
  G. 
  F. 
  Whidborne, 
  M.A., 
  in 
  which 
  every 
  known 
  

   British 
  species 
  of 
  Plesiosaur 
  is 
  given, 
  with 
  horizon, 
  locality, 
  and 
  

   references 
  to 
  literature. 
  The 
  entire 
  paper 
  is 
  a 
  valuable 
  contribution 
  

   to 
  our 
  knowledge 
  of 
  this 
  group 
  of 
  the 
  Reptilia. 
  

  

  