﻿Mr. 
  A. 
  S. 
  Woodward's 
  Palceichthyological 
  Notes. 
  299 
  

  

  and 
  even 
  if 
  it 
  seemed 
  advisable 
  to 
  scientifically 
  establish 
  the 
  

   term, 
  this 
  is 
  prevented 
  by 
  its 
  preoccupation 
  in 
  the 
  writings 
  

   of 
  Romano 
  wsky 
  * 
  and 
  Newberry 
  and 
  Worthenf. 
  

  

  Under 
  any 
  circumstances 
  Mr. 
  Brodie's 
  discovery 
  of 
  the 
  

   teeth 
  in 
  natural 
  order 
  is 
  one 
  of 
  considerable 
  interest 
  ; 
  and 
  

   the 
  next 
  desideratum 
  is 
  the 
  actual 
  proof 
  of 
  their 
  connexion 
  or 
  

   otherwise 
  with 
  the 
  ribbed 
  fin-spines 
  and 
  hooked 
  cephalic 
  

   spines 
  already 
  mentioned. 
  

  

  2. 
  On 
  Diplodus 
  Moorei, 
  sp. 
  nov.,from 
  the 
  Keuper 
  of 
  

   Somersetshire. 
  

  

  Extremely 
  rare 
  small 
  teeth 
  suggestive 
  of 
  the 
  Carboniferous 
  

   Cladodus 
  also 
  occur 
  in 
  the 
  English 
  Keuper 
  ; 
  but 
  still 
  more 
  

   remarkable 
  is 
  the 
  discovery 
  of 
  teeth 
  undistinguishable 
  from 
  

   the 
  well-known 
  Palajozoic 
  Diplodus. 
  There 
  are 
  nine 
  ex- 
  

   amples 
  of 
  these 
  teeth 
  from 
  Ruishton, 
  near 
  Taunton, 
  in 
  the 
  

   collection 
  of 
  the 
  late 
  Mr. 
  Charles 
  Moore, 
  F.Gr.S., 
  in 
  the 
  Bath 
  

   Museum, 
  and 
  through 
  the 
  kindness 
  of 
  the 
  Rev. 
  H. 
  H. 
  Win- 
  

   wood, 
  M.A., 
  F.G.S., 
  the 
  writer 
  has 
  recently 
  had 
  the 
  pleasure 
  

   of 
  examining 
  this 
  fine 
  series. 
  All 
  the 
  teeth 
  are 
  approxi- 
  

   mately 
  similar 
  in 
  form 
  and 
  proportions, 
  and 
  one 
  is 
  shown 
  

   from 
  the 
  outer 
  aspect 
  in 
  PI. 
  XIV. 
  fig. 
  4, 
  while 
  another 
  

   exhibits 
  the 
  inner 
  aspect 
  shown 
  in 
  PI. 
  XIV. 
  fig. 
  5, 
  both 
  the 
  

   figures 
  being 
  of 
  twice 
  the 
  natural 
  size. 
  

  

  Each 
  tooth 
  has 
  a 
  narrow, 
  horizontally 
  extended, 
  depressed 
  

   root, 
  acutely 
  rounded 
  at 
  its 
  posterior 
  or 
  inner 
  extremity, 
  and 
  

   a 
  very 
  large, 
  oval, 
  raised 
  pad 
  (or 
  " 
  button 
  ") 
  occupies 
  the 
  

   anterior 
  or 
  outer 
  portion 
  of 
  the 
  root, 
  both 
  above 
  and 
  below, 
  

   indicating 
  the 
  originally 
  firm 
  articulation 
  of 
  the 
  successive 
  

   teeth 
  of 
  the 
  transverse 
  series. 
  The 
  two 
  cusps 
  of 
  the 
  dental 
  

   crown 
  are 
  short 
  and 
  stout, 
  rounded 
  in 
  section, 
  and 
  very 
  

   slightly 
  divergent 
  ; 
  and, 
  though 
  a 
  definite 
  keel 
  is 
  absent, 
  the 
  

   outer 
  face 
  of 
  each 
  cusp 
  is 
  sometimes 
  marked 
  by 
  two 
  or 
  three 
  

   vertical 
  wrinkles 
  in 
  its 
  superior 
  portion. 
  In 
  well-preserved 
  

   specimens 
  there 
  is 
  also 
  a 
  minute 
  denticle, 
  occupying 
  the 
  

   usual 
  position 
  in 
  the 
  middle 
  of 
  the 
  tooth 
  (PI. 
  XIV. 
  fig. 
  4) 
  . 
  

  

  In 
  most 
  known 
  forms 
  of 
  Diplodus 
  the 
  coronal 
  cusps 
  are 
  

   compressed 
  and 
  laterally 
  keeled 
  and 
  thus 
  very 
  different 
  from 
  

   those 
  of 
  the 
  Keuper 
  teeth 
  just 
  described. 
  It 
  only 
  seems 
  

   necessary 
  indeed 
  to 
  compare 
  the 
  new 
  fossils 
  with 
  one 
  species 
  

   already 
  established 
  — 
  D. 
  tenuis, 
  typically 
  represented 
  in 
  the 
  

  

  * 
  H. 
  Romanowsky, 
  Bull. 
  Soc. 
  Imp. 
  Nat. 
  Moscou, 
  1864, 
  pt. 
  ii. 
  p. 
  160. 
  

   t 
  Pal. 
  Illinois, 
  vol. 
  iv. 
  (1870), 
  p. 
  360. 
  

  

  