﻿SEMT0N0TID.E. 
  107 
  

  

  1885. 
  Lepidotusm 
  aximus, 
  F. 
  Bassani, 
  Atti 
  Soc. 
  Ital. 
  Sci. 
  Nat. 
  vol.xxviii. 
  

  

  pp. 
  80, 
  154, 
  pi. 
  ii. 
  a. 
  figs. 
  12, 
  13.] 
  

   1889. 
  Lepidotus 
  maximus, 
  Etheridge 
  & 
  Willett, 
  Quart. 
  Journ. 
  Geol. 
  

  

  Soc. 
  vol. 
  xlv. 
  p. 
  356, 
  pi. 
  xv. 
  

  

  Type. 
  Detached 
  teeth 
  ; 
  Museums 
  of 
  Oxford, 
  Paris, 
  and 
  Stuttgart. 
  

  

  The 
  type 
  species 
  of 
  the 
  so-called 
  genus 
  JSphcerodus, 
  attaining 
  a 
  

   length 
  of 
  probably 
  not 
  less 
  than 
  2 
  metres, 
  but 
  known 
  only 
  from 
  

   fragments. 
  Teeth 
  very 
  broad 
  and 
  gently 
  rounded, 
  except 
  towards 
  the 
  

   margin 
  of 
  the 
  upper 
  jaw, 
  where 
  they 
  become 
  obtusely 
  conical 
  ; 
  teeth 
  

   of 
  mandible 
  relatively 
  large 
  and 
  arranged 
  in 
  four 
  or 
  five 
  irregular 
  

   concentric 
  series. 
  Principal 
  flank-scales 
  with 
  a 
  few 
  broad 
  ridges 
  and 
  

   furrows 
  radiating 
  from 
  the 
  centre 
  to 
  the 
  hinder 
  border, 
  where 
  they 
  

   form 
  feeble 
  indentations 
  ; 
  superficial 
  layer 
  of 
  ganoine 
  comparatively 
  

   thin, 
  sometimes 
  discontinuous, 
  sometimes 
  with 
  few 
  granulations. 
  

  

  This 
  species 
  as 
  yet 
  is 
  only 
  clearly 
  distinguished 
  from 
  Lepidotus 
  

   palliatus 
  by 
  the 
  characters 
  of 
  the 
  mandibular 
  dentition, 
  and 
  some 
  

   of 
  the 
  fragments 
  entered 
  above 
  under 
  the 
  last-named 
  species 
  may 
  

   belong 
  to 
  L. 
  maximus. 
  

  

  Form. 
  Sf 
  Log. 
  Upper 
  Corallian 
  : 
  Wiirtemberg. 
  Kimmeridgian 
  : 
  

   S. 
  England, 
  N. 
  Prance, 
  Switzerland, 
  Tyrol, 
  and 
  Sicily. 
  Portlandian 
  : 
  

   Prance, 
  Italy, 
  and 
  Germany. 
  Neocomian 
  : 
  Cambridgeshire, 
  Berk- 
  

   shire, 
  and 
  Bedfordshire 
  {derived) 
  ; 
  Haute 
  Maine, 
  Prance 
  ; 
  Switzer- 
  

   land. 
  

  

  P. 
  6723. 
  Imperfect 
  right 
  splenial 
  showing 
  the 
  arrangement 
  of 
  the 
  

   dentition, 
  with 
  successional 
  teeth, 
  noticed 
  in 
  Quart. 
  Journ. 
  

   Geol. 
  Soc. 
  vol. 
  xlv. 
  p. 
  357, 
  no. 
  iii. 
  ; 
  Kimmeridge 
  Clay, 
  

   Shotover, 
  near 
  Oxford. 
  

  

  Presented 
  by 
  Henry 
  Willett, 
  Esq., 
  1892. 
  

  

  P. 
  6724. 
  Tooth 
  with 
  successor, 
  in 
  transverse 
  section, 
  figured 
  ibid. 
  

   pi. 
  xv. 
  fig. 
  3 
  ; 
  Shotover. 
  

  

  Presented 
  by 
  Henry 
  Willett, 
  Esq., 
  1892, 
  

  

  P. 
  1677, 
  P. 
  4658. 
  Detached 
  teeth 
  ; 
  Tithonian 
  formation, 
  Trient, 
  

   Tyrol. 
  Egerton 
  Sf 
  Enniskillen 
  Colls. 
  

  

  22482-83, 
  22488, 
  28506, 
  32754, 
  36148. 
  Several 
  detached 
  teeth 
  ; 
  

   Corallian, 
  Schnaitheim, 
  Wiirtemberg. 
  

  

  Purcliased, 
  1847, 
  1848, 
  1859. 
  

  

  36148 
  a. 
  Two 
  abraded 
  teeth 
  associated 
  with 
  two 
  successional 
  teeth, 
  

   each 
  of 
  the 
  latter 
  exhibiting 
  a 
  minute 
  central 
  coronal 
  

   tubercle 
  ; 
  Schnaitheim. 
  Purchased, 
  1859. 
  

  

  P. 
  1679. 
  Plaster 
  cast 
  of 
  imperfect 
  left 
  palatine 
  dentition 
  : 
  Upper 
  

   Jurassic, 
  Switzerland. 
  Egerton 
  Coll. 
  

  

  