﻿semionotid^:. 
  89 
  

  

  28606. 
  Two 
  detached 
  teeth 
  ; 
  Great 
  Oolite, 
  Eyeford, 
  Gloucestershire. 
  

  

  Purchased, 
  1853. 
  

  

  47137. 
  Imperfect 
  caudal 
  region, 
  measuring 
  about 
  0*12 
  from 
  the 
  

   dorsal 
  fin 
  to 
  the 
  extremity 
  of 
  the 
  upper 
  caudal 
  lobe 
  and 
  

   0*065 
  in 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle, 
  noticed 
  in 
  Proc. 
  

   Geol. 
  Assoc, 
  vol. 
  xi. 
  p. 
  292; 
  Great 
  Oolite, 
  CoHington, 
  

   Northamptonshire. 
  The 
  scales 
  are 
  shown 
  in 
  impression 
  

   and 
  the 
  median 
  fins 
  are 
  very 
  imperfect. 
  The 
  small 
  anal 
  

   is 
  opposed 
  to 
  the 
  hinder 
  portion 
  of 
  the 
  dorsal. 
  Sharp 
  Coll. 
  

  

  P. 
  471. 
  Scale 
  described 
  and 
  figured 
  by 
  Agassiz, 
  op. 
  cit., 
  under 
  the 
  

   name 
  of 
  Lepidotus 
  unguiculatus, 
  and 
  recorded 
  as 
  Lepidotus 
  

   rnaximus, 
  Agassiz, 
  in 
  Egerton's 
  ' 
  Systematic 
  Catalogue,' 
  

   1837 
  ; 
  Stonesfield 
  State. 
  Egerton 
  Coll. 
  

  

  28607, 
  37219. 
  Three 
  imperfect 
  small 
  scales 
  ; 
  Stonesfield 
  Slate. 
  

  

  Purchased, 
  1853, 
  1863. 
  

  

  47980. 
  Two 
  caudal 
  scales 
  ; 
  Stonesfield 
  Slate. 
  

  

  Presented 
  by 
  the 
  Hon. 
  Robert 
  Mar 
  sham, 
  1877. 
  

  

  P. 
  1111, 
  P. 
  3524. 
  Fourteen 
  small 
  scales 
  ; 
  Stonesfield 
  Slate. 
  

  

  Egerton 
  <$f 
  Enniskillen 
  Colls. 
  

  

  30569. 
  Two 
  small 
  scales 
  ; 
  Forest 
  Marble, 
  Atford, 
  near 
  Bath. 
  

  

  Purchased, 
  1856. 
  

  

  Lepidotus 
  latifrons, 
  A. 
  S. 
  Woodward. 
  

  

  1893. 
  Lepidotus 
  latifrons, 
  A. 
  S. 
  Woodward, 
  Proc. 
  Zool. 
  Soc. 
  p. 
  560, 
  

   pi. 
  xlix. 
  figs. 
  1, 
  2, 
  pi. 
  1. 
  figs. 
  1, 
  2. 
  

  

  Type. 
  Bones 
  and 
  scales 
  of 
  head 
  and 
  trunk 
  ; 
  British 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  1 
  metre 
  ; 
  form 
  and 
  pro- 
  

   portions 
  unknown. 
  External 
  bones 
  rugose 
  and 
  ornamented 
  for 
  the 
  

   most 
  part 
  with 
  closely-arranged 
  tuberculations, 
  sometimes 
  fused 
  

   into 
  short 
  rugae 
  ; 
  parietal 
  bones 
  very 
  unequal 
  in 
  size, 
  averaging 
  

   about 
  half 
  the 
  length 
  of 
  the 
  frontals, 
  which 
  are 
  united 
  in 
  a 
  much- 
  

   jagged 
  median 
  suture, 
  are 
  not 
  much 
  narrowed 
  in 
  front, 
  and 
  are 
  

   about 
  twice 
  as 
  long 
  as 
  broad 
  ; 
  tooth-bearing 
  portion 
  of 
  the 
  dentary 
  

   slender, 
  somewhat 
  deepened 
  at 
  the 
  symphysis 
  ; 
  series 
  of 
  supra- 
  

   temporal 
  plates 
  comprising 
  three 
  scale-shaped 
  median 
  ones 
  and 
  a 
  

   relatively 
  large 
  outer 
  pair. 
  Marginal 
  teeth 
  styliform 
  and 
  slender, 
  

   a 
  series 
  of 
  6 
  in 
  the 
  premaxilla 
  ; 
  inner 
  teeth 
  mostly 
  larger, 
  stouter, 
  

   and 
  obtuse, 
  but 
  fixed 
  on 
  long 
  pedicles. 
  Maximum 
  width 
  of 
  oper- 
  

   culum 
  about 
  two-thirds 
  as 
  great 
  as 
  its 
  depth 
  ; 
  and 
  maximum 
  depth 
  

   of 
  suboperculum 
  not 
  quite 
  one-third 
  that 
  of 
  operculum. 
  Ring- 
  

  

  