﻿356 
  MESSES. 
  E. 
  ETHER1DGE 
  AND 
  H. 
  WILLETT 
  ON 
  THE 
  

  

  20. 
  On 
  the 
  Dentition 
  of 
  Lepieotes 
  maximus, 
  Wagner, 
  as 
  illus- 
  

   trated 
  by 
  Specimens 
  from 
  the 
  Kimeriege 
  Clay 
  of 
  Shotoyer 
  

   Hell, 
  near 
  Oxford. 
  By 
  Robert 
  Etheriege, 
  Esq., 
  E.P.S., 
  

   E.G.S., 
  and 
  Henry 
  Wielett, 
  Esq., 
  P.G.S. 
  (Bead 
  January 
  23, 
  

   1889.) 
  

  

  [Plate 
  XV.] 
  

  

  The 
  specimens 
  upon 
  which 
  this 
  paper 
  is 
  founded 
  were 
  obtained 
  by 
  

   one 
  of 
  us 
  (Mr. 
  Heury 
  Willett) 
  from 
  the 
  Kimeridge 
  Clay 
  of 
  Shotover 
  

   Hill, 
  and 
  at 
  no 
  great 
  distance 
  from 
  each 
  other, 
  although 
  at 
  different 
  

   times 
  — 
  two 
  in 
  the 
  spring 
  and 
  one 
  in 
  the 
  autumn 
  of 
  1887, 
  and 
  the 
  

   fourth 
  in 
  the 
  spring 
  1888. 
  The 
  size 
  and 
  perfection 
  of 
  these 
  speci- 
  

   mens 
  are 
  alone 
  sufficient 
  to 
  warrant 
  their 
  being 
  brought 
  under 
  the 
  

   notice 
  of 
  the 
  Society 
  : 
  but, 
  besides 
  this, 
  one 
  of 
  them 
  appears 
  to 
  

   represent 
  a 
  distinct 
  species, 
  probably 
  new 
  to 
  England, 
  if 
  not 
  also 
  to 
  

   the 
  Kimeridgian 
  fauna 
  of 
  Prance. 
  

  

  The 
  species 
  of 
  Lepidotus 
  known 
  in 
  England 
  are 
  as 
  follows 
  : 
  — 
  

  

  Lepidotus 
  firiibriatus, 
  Ag 
  ^ 
  

  

  gigas,Ag 
  | 
  

  

  „ 
  pectinatus, 
  Egert 
  \- 
  Lias. 
  

  

  ., 
  rugosus, 
  Ag 
  | 
  

  

  ,, 
  semiserratus, 
  Ag 
  J 
  

  

  ,, 
  tuberculatus, 
  Ag 
  ] 
  ^ 
  . 
  ^ 
  ,., 
  

  

  • 
  w 
  . 
  P 
  y 
  Great 
  Oolite. 
  

  

  , 
  , 
  unguiculatus, 
  Ag. 
  ...... 
  J 
  

  

  „ 
  macrochirus, 
  Egert. 
  ... 
  Oxford 
  Clay. 
  

  

  ., 
  maximus, 
  "Wagn 
  1 
  Kimeridge 
  Clay 
  and 
  

  

  „ 
  minor, 
  Ag 
  j" 
  Portland 
  Kocks. 
  

  

  ,, 
  minor, 
  Ag 
  Purbeck. 
  

  

  ;; 
  "if::::::::::::}™* 
  1 
  *- 
  

  

  „ 
  punctatus, 
  Egert 
  Upper 
  Chalk. 
  

  

  Section 
  LEPTOGANOIDEI. 
  

  

  Suborder 
  Lepidosteoidei. 
  

  

  The 
  Lepidosteoid 
  Eishes 
  range 
  from 
  the 
  Permian 
  to 
  the 
  present 
  

   day. 
  They 
  are 
  represented 
  in 
  the 
  Permian 
  rocks 
  by 
  the 
  genus 
  

   Acentrophorus. 
  The 
  following 
  genera 
  range 
  through 
  the 
  British 
  

   Secondary 
  rocks 
  : 
  — 
  

  

  Trias 
  : 
  Semionotus, 
  Ag. 
  ; 
  Saurichthys, 
  Ag. 
  

  

  Lias 
  : 
  Semionotus, 
  Ag. 
  ; 
  Lepidotus, 
  Ag. 
  ; 
  Dapedius, 
  Ag. 
  ; 
  Eugnathus, 
  Ag. 
  : 
  

  

  Tetragonolcpis, 
  Ag. 
  ; 
  Hcterolepidotus, 
  Egert. 
  ; 
  Pholidojohorus, 
  Ag. 
  ; 
  

  

  Pachycormus, 
  Ag. 
  ; 
  Ptycholepis, 
  Ag. 
  ; 
  Nothosomus, 
  Ag. 
  ; 
  Aspidorhyn- 
  

  

  chus, 
  Ag. 
  

   Great 
  Oolite 
  : 
  Mesodon, 
  Heck. 
  ; 
  Pycnodus, 
  Ag. 
  ; 
  Gyrodus, 
  Ag. 
  : 
  Lepidotus, 
  

  

  Ag- 
  

   Coral 
  Eag 
  : 
  Gyrodus, 
  Ag. 
  ; 
  Pycnodus, 
  Ag. 
  

  

  Kimeridge 
  Clay 
  : 
  Gyrodus, 
  Ag. 
  ; 
  Pycnodus, 
  Ag. 
  ; 
  Lepidotus, 
  Ag. 
  

   Portland 
  Oolite 
  : 
  Pycnodus, 
  Ag. 
  ; 
  Ophiopsis, 
  Ag. 
  ; 
  Lepidotus, 
  Ag. 
  

  

  