﻿100 
  

  

  ACTIIfOPTERYGII. 
  

  

  antero-superior 
  process. 
  Scales 
  large 
  and 
  smooth, 
  those 
  of 
  the 
  

   anterior 
  portion 
  of 
  the 
  flank 
  with 
  few 
  large 
  denticulations 
  at 
  least 
  

   in 
  their 
  lower 
  half 
  ; 
  dorsal 
  ridge-scales 
  with 
  slender 
  acumination. 
  

  

  Pigs. 
  19-21. 
  

  

  Fig. 
  19. 
  — 
  Lepidotus 
  macrocheirus 
  ; 
  anterior 
  half 
  ^of 
  right 
  mandibular 
  ramus 
  

  

  from 
  the 
  outer 
  and 
  oral 
  (a) 
  aspects. 
  — 
  Oxford 
  Clay; 
  Peterborough. 
  [No. 
  P. 
  

  

  6839.] 
  — 
  d., 
  dentary 
  ; 
  spl., 
  splenial. 
  

   Pig. 
  20. 
  — 
  Lepidotus 
  leedsi; 
  left 
  operculum 
  (op.) 
  and 
  suboperculum 
  (s.op.), 
  outer 
  

  

  aspect.— 
  Oxford 
  Clay 
  ; 
  Peterborough. 
  [No. 
  P. 
  6837.] 
  

   Fig. 
  20 
  a. 
  — 
  Ditto 
  ; 
  imperfect 
  right 
  mandibular 
  ramus, 
  outer 
  aspect, 
  of 
  same 
  

  

  specimen, 
  showing 
  angular 
  (ag.) 
  and 
  dentary 
  (d.). 
  

   Fig. 
  21. 
  — 
  Ditto 
  ; 
  left 
  dentary, 
  outer 
  aspect, 
  and 
  lateral 
  view 
  "of 
  tooth 
  (a). 
  — 
  

  

  Kimmeridge 
  Clay 
  ; 
  Weymouth. 
  [No. 
  41964 
  c] 
  

  

  All 
  these 
  figures 
  two-thirds 
  nat. 
  size. 
  

  

  In 
  this 
  species 
  the 
  operculum 
  is 
  much 
  larger 
  in 
  proportion 
  to 
  the 
  

   mandible 
  than 
  in 
  L. 
  macrocheirus. 
  

  

  Form. 
  Sf 
  Loc. 
  Oxfordian 
  : 
  Huntingdonshire. 
  Kimmeridgian 
  ; 
  

   Dorsetshire. 
  

  

  P. 
  6837. 
  Type 
  specimen, 
  comprising 
  the 
  associated 
  imperfect 
  right 
  

   mandibular 
  ramus, 
  squamosals, 
  other 
  cranial 
  bones, 
  epi- 
  

   hyal, 
  ceratohyals, 
  left 
  operculum 
  and 
  interoperculum, 
  

  

  