﻿Geological 
  Society. 
  369 
  

  

  January 
  23, 
  L889.— 
  W. 
  T. 
  Blanford, 
  LL.D., 
  F.R.S., 
  

   President, 
  in 
  the 
  Chair. 
  

  

  The 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  1. 
  "On 
  Remains 
  of 
  Eocene 
  and 
  Mesozoic 
  Chelonia, 
  and 
  on 
  a 
  

   Tooth 
  of 
  (?) 
  Ornithopsis." 
  By 
  R. 
  Lydekker, 
  Esq., 
  B.A., 
  F.G.S. 
  

  

  This 
  communication 
  treated 
  in 
  the 
  first 
  place 
  of 
  remains 
  of 
  Chelonia 
  

   from 
  the 
  Cambridge 
  Greensand, 
  Wealden, 
  and 
  London 
  Clay. 
  Firstly, 
  

   Rhinochelys, 
  from 
  the 
  Cambridge 
  Greensand. 
  was 
  considered 
  to 
  

   indicate 
  a 
  Plenrodiran 
  type 
  : 
  and 
  four 
  new 
  specific 
  names 
  were 
  pro- 
  

   posed, 
  viz. 
  11. 
  macrorhina, 
  R. 
  brachyrhina, 
  R. 
  Jessoni, 
  and 
  R.canta- 
  

   brigiensis. 
  From 
  the 
  same 
  deposits 
  a 
  skull 
  was 
  described 
  which 
  

   was 
  considered 
  to 
  indicate 
  a 
  new 
  species 
  of 
  Chelone, 
  for 
  which 
  the 
  

   name 
  0. 
  Jessoni 
  was 
  proposed. 
  Other 
  remains 
  of 
  marine 
  Che- 
  

   lonians 
  from 
  these 
  beds 
  were 
  regarded 
  as 
  indicating 
  a 
  Turtle 
  allied 
  

   to 
  the 
  Loggerhead, 
  and 
  were 
  provisionally 
  referred 
  to 
  the 
  genus 
  

   Lytohma, 
  as 
  L, 
  cantabrigiense. 
  In 
  the 
  course 
  of 
  the 
  description, 
  it 
  

   was 
  proposed 
  to 
  replace 
  the 
  name 
  Euclastes 
  (preoccupied) 
  by 
  Lyto- 
  

   loma. 
  

  

  Of 
  other 
  Chelonidse, 
  the 
  new 
  generic 
  name 
  Aryillochelys 
  was 
  pro- 
  

   posed 
  for 
  Chelone 
  cuneiceps, 
  Owen, 
  of 
  the 
  London 
  Clay, 
  which 
  

   would 
  also 
  include 
  some 
  other 
  forms 
  from 
  the 
  same 
  beds. 
  

  

  A 
  shell 
  of 
  a 
  Plesiochelys 
  from 
  the 
  Wealden 
  of 
  the 
  Isle 
  of 
  Wight 
  

   was 
  regarded 
  as 
  indicating 
  a 
  new 
  species, 
  which 
  was 
  named 
  

   P. 
  Brodii 
  i. 
  

  

  It 
  was 
  also 
  shown 
  that 
  Chelone 
  gigans, 
  Owen, 
  of 
  the 
  London 
  

   Clay, 
  did 
  not 
  belong 
  to 
  the 
  Chelonidse 
  at 
  all, 
  but 
  indicated 
  a 
  species 
  

   of 
  the 
  genus 
  Psi 
  phophoriis 
  — 
  a 
  member 
  of 
  the 
  Dermatochelydidae. 
  

  

  The 
  next 
  section 
  of 
  the 
  paper 
  described 
  a 
  peculiar 
  mandibular 
  

   symphysis 
  from 
  the 
  London 
  Clay, 
  which 
  was 
  taken 
  to 
  indicate 
  a 
  new 
  

   genus 
  of 
  Chelonia, 
  to 
  be 
  named 
  Dacochelys; 
  and 
  it 
  was 
  suggested 
  

   that 
  Emys 
  Delabeehei, 
  Owen, 
  might 
  be 
  the 
  same 
  form. 
  

  

  The 
  paper 
  concluded 
  with 
  a 
  notice 
  of 
  a 
  tooth 
  from 
  the 
  Wealden, 
  

   of 
  the 
  same 
  general 
  type 
  as 
  one 
  previously 
  referred 
  by 
  the 
  author 
  to 
  

   Ornithopsis 
  ; 
  audit 
  was 
  shown 
  that 
  teeth 
  from 
  the 
  Portlandian 
  of 
  

   Boulogne, 
  which 
  had 
  been 
  described 
  as 
  Neosodon 
  and 
  Caulodon, 
  and 
  

   regarded 
  as 
  Iguanodont, 
  were 
  likewise 
  of 
  the 
  same 
  general 
  type. 
  It 
  

   was 
  also 
  shown 
  that 
  Cardiodon, 
  "wen, 
  from 
  the 
  Forest 
  Marble, 
  

   belonged 
  to 
  the 
  same 
  group. 
  

  

  2. 
  '"On 
  the 
  Dentition 
  of 
  Lepidotus 
  maximus, 
  Wagn., 
  as 
  indicated 
  

   by 
  specimens 
  from 
  the 
  Kimeridge 
  Clay 
  of 
  Shotover 
  Hill, 
  near 
  

   Oxford." 
  By 
  R. 
  Etheridge, 
  Esq.,' 
  F.R.S., 
  F.G.S., 
  and 
  II. 
  Willett, 
  

   Esq., 
  F.G.S. 
  

  

  The 
  paper 
  commenced 
  with 
  a 
  list 
  of 
  fourteen 
  species 
  of 
  Lepidotus 
  

   known 
  in 
  England, 
  from 
  beds 
  between 
  the 
  Lias 
  and 
  Upper 
  Chalk 
  

   inclusive, 
  and 
  an 
  account 
  of 
  the 
  range 
  of 
  the 
  Lepidosteoid 
  fishes 
  

   irom 
  Permian 
  times 
  to 
  the 
  present 
  day 
  followed. 
  The 
  occurrence 
  

  

  