﻿358 
  ON 
  THE 
  DENTITION 
  OF 
  LEPIDOTUS 
  MAXIMTJS. 
  

  

  Wagn.; 
  but 
  the 
  bone 
  is 
  broader 
  in 
  proportion 
  to 
  its 
  length, 
  and 
  the 
  

   teeth 
  are 
  more 
  numerous*. 
  

  

  No. 
  IV. 
  This 
  corresponds 
  undoubtedly 
  to 
  Splicerodus 
  gigcis, 
  

   Ag. 
  (L. 
  maocimus, 
  Wagn.), 
  so 
  well 
  described 
  and 
  figured 
  by 
  Pictet 
  

   and 
  Jaccard 
  f. 
  The 
  dentition 
  of 
  this 
  specimen 
  does 
  not, 
  however, 
  

   appear 
  to 
  belong 
  to 
  the 
  left 
  upper 
  jaw, 
  but 
  to 
  the 
  dentary 
  bone. 
  

   Figs. 
  1 
  c 
  and 
  1 
  d 
  of 
  pi. 
  viii. 
  of 
  Pictet 
  and 
  Jaccard 
  exhibit 
  the 
  

   successional 
  teeth 
  ; 
  and 
  figs. 
  1 
  a 
  and 
  1 
  b 
  the 
  upper 
  and 
  lower 
  

   surfaces. 
  

  

  The 
  upper 
  surface 
  of 
  No. 
  IV. 
  (PI. 
  XV. 
  fig. 
  1) 
  contains 
  17 
  teeth, 
  

   and 
  the 
  lower 
  or 
  successional 
  series 
  (fig. 
  2) 
  consists 
  of 
  15 
  = 
  32 
  in 
  

   position. 
  PI. 
  XV. 
  fig. 
  3 
  shows 
  a 
  successional 
  tooth 
  in 
  process 
  of 
  

   reversal. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  XY. 
  

  

  Fig. 
  1. 
  Lepidotus 
  maocimus, 
  Wagn., 
  dentary 
  bone, 
  upper 
  surface 
  with 
  17 
  teeth. 
  

  

  2. 
  The 
  same, 
  lower 
  surface 
  with 
  15 
  teeth. 
  

  

  3. 
  Section 
  through 
  an 
  upper 
  and 
  a 
  lower 
  or 
  successional 
  tooth, 
  showing 
  

  

  the 
  reversal 
  of 
  the 
  latter 
  in 
  progress. 
  

  

  All 
  the 
  figures 
  of 
  the 
  natural 
  size. 
  

  

  Discussion. 
  

  

  The 
  President 
  thanked 
  Mr. 
  Etheridge 
  for 
  bringing 
  forward 
  a 
  

   species 
  of 
  such 
  interest, 
  and 
  an 
  addition 
  to 
  the 
  fossil 
  fauna 
  of 
  Great 
  

   Britain. 
  

  

  Mr. 
  Smith 
  Woodward 
  stated 
  that 
  we 
  were 
  able 
  now 
  to 
  compare 
  

   the 
  British 
  specimens 
  with 
  the 
  Continental 
  ones. 
  Sir 
  P. 
  Egerton, 
  

   about 
  twenty 
  years 
  ago, 
  supposed 
  that 
  he 
  had 
  teeth 
  of 
  the 
  form 
  

   described 
  on 
  a 
  Pycnodont 
  vomerine 
  bone 
  from 
  the 
  English 
  Kim- 
  

   eridge 
  Clay, 
  and 
  thus 
  considered 
  that 
  Splicer 
  odus 
  had 
  no 
  relation 
  

   with 
  Lepidotus. 
  It 
  now 
  appears 
  that 
  this 
  determination 
  was 
  

   erroneous, 
  and 
  that 
  the 
  Continental 
  view 
  is 
  correct. 
  

  

  Prof. 
  Seelet 
  mentioned 
  that 
  the 
  teeth 
  had 
  long 
  been 
  among 
  the 
  

   commonest 
  fossils 
  from 
  the 
  Potton 
  beds, 
  and 
  the 
  succession 
  of 
  the 
  

   teeth 
  was 
  first 
  shown 
  in 
  those 
  fossils, 
  but 
  the 
  specimens 
  were 
  not 
  

   comparable 
  with 
  those 
  exhibited. 
  

  

  Mr. 
  E. 
  T. 
  Newton 
  spoke 
  of 
  specimens 
  of 
  Lepidotus 
  from 
  the 
  

   Wealden, 
  which 
  also 
  showed 
  this 
  remarkable 
  reversal 
  of 
  the 
  teeth, 
  

   and 
  thus 
  indicated 
  a 
  close 
  affinity 
  between 
  the 
  Wealden 
  Lepidotus 
  

   and 
  the 
  Kimeridge 
  Clay, 
  so-called, 
  Sphcerodus. 
  

  

  Mr. 
  Etheridoe 
  wished 
  to 
  record 
  the 
  indebtedness 
  of 
  the 
  Society 
  

   to 
  Mr. 
  Willett. 
  He 
  considered 
  the 
  Potton 
  fossils 
  remanies 
  from 
  the 
  

   Kimeridge 
  Clay. 
  

  

  * 
  See 
  H. 
  E. 
  Sauvage, 
  Mem. 
  Soc. 
  Geol. 
  France, 
  ser. 
  3, 
  vol. 
  i. 
  pp. 
  1-17, 
  pi. 
  i. 
  

   fig. 
  2. 
  

  

  t 
  Pal. 
  Suisse, 
  vol. 
  for 
  1860, 
  ■ 
  Keptiles 
  et 
  Poissons 
  fossiles,' 
  &c, 
  pp. 
  35-41, 
  

   pis. 
  8, 
  9, 
  4, 
  pi. 
  18. 
  1. 
  

  

  