﻿SEHIONOTID^;. 
  

  

  119 
  

  

  P. 
  6363 
  a, 
  b. 
  Two 
  portions 
  of 
  dentition, 
  many 
  of 
  the 
  teeth 
  being 
  

   relatively 
  small 
  and 
  well 
  spaced 
  ; 
  Hastings. 
  

  

  BecJcles 
  Coll. 
  

  

  P. 
  1123, 
  P. 
  1125. 
  Two 
  waterworn 
  portions 
  of 
  squamation 
  ; 
  Isle 
  of 
  

   Wight. 
  Egerton 
  Coll. 
  

  

  P. 
  7419. 
  Scales 
  ; 
  Brook, 
  Isle 
  of 
  Wight. 
  

  

  Lepidotus 
  degenhardti, 
  Branco. 
  

  

  1885. 
  Lepidotus 
  degenhardti, 
  W. 
  Branco, 
  Jahrb. 
  preuss. 
  geol. 
  Landes- 
  

  

  anst. 
  1884, 
  p. 
  183, 
  pi. 
  viii., 
  pi. 
  ix. 
  fig. 
  1. 
  

   1887. 
  Lepidotus 
  degenhardti, 
  W. 
  Branco, 
  Abh. 
  geol. 
  Specialk. 
  Preussen 
  

  

  u. 
  Thiiring. 
  Staaten, 
  vol. 
  vii. 
  p. 
  330, 
  pi. 
  i. 
  

   1887. 
  Lepidotus 
  degenhardti, 
  var. 
  dubia, 
  W. 
  Branco, 
  ibid. 
  p. 
  332, 
  pi. 
  ii. 
  

  

  figs. 
  1-5. 
  

  

  Type. 
  Imperfect 
  fish 
  ; 
  Geological 
  Survey 
  Museum, 
  Berlin. 
  

  

  A 
  large 
  species 
  closely 
  resembling 
  L. 
  mantelli, 
  but 
  apparently 
  

   somewhat 
  deeper 
  in 
  proportion 
  to 
  its 
  length. 
  Maximum 
  width 
  of 
  

   operculum 
  about 
  two-thirds 
  as 
  great 
  as 
  its 
  depth, 
  and 
  equalling 
  

   one-half 
  the 
  length 
  of 
  the 
  head 
  ; 
  frontal 
  profile 
  very 
  steep, 
  slightly 
  

   convex. 
  External 
  bones 
  more 
  or 
  less 
  rugose 
  or 
  tuberculated. 
  

   Inner 
  teeth 
  short 
  and 
  stout, 
  with 
  a 
  smooth 
  and 
  slightly 
  acuminate 
  

   crown. 
  Pin-fulcra 
  very 
  large 
  ; 
  pelvic 
  fins 
  arising 
  midway 
  between 
  

   the 
  pectorals 
  and 
  the 
  anal 
  ; 
  anal 
  fin 
  arising 
  opposite 
  a 
  point 
  con- 
  

   siderably 
  in 
  advance 
  of 
  the 
  hinder 
  extremity 
  of 
  the 
  dorsal. 
  Scales 
  

   showing 
  a 
  few 
  oblique 
  ridges 
  beneath 
  the 
  enamel 
  in 
  their 
  anterior 
  

   half 
  ; 
  principal 
  flank-scales 
  with 
  two 
  or 
  three 
  very 
  large 
  denticula- 
  

   tions 
  on 
  the 
  lower 
  half 
  of 
  their 
  posterior 
  border 
  ; 
  dorsal 
  ridge-scales 
  

   inconspicuous 
  but 
  acuminate. 
  

  

  Form. 
  &f 
  Log. 
  Wealden 
  : 
  Obernkirchen, 
  Prussia. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Lepidotus 
  hauchecornei, 
  Branco. 
  

  

  1887. 
  Lepidotus 
  hauchecornei, 
  W. 
  Branco, 
  Abh. 
  geol. 
  Specialk. 
  Preussen 
  

   u. 
  Thiiring. 
  Staaten, 
  vol. 
  vii. 
  p. 
  348, 
  pi. 
  iv. 
  figs. 
  1, 
  2, 
  pi. 
  vii. 
  fig. 
  1. 
  

  

  Type. 
  Imperfect 
  fish, 
  wanting 
  the 
  greater 
  part 
  of 
  the 
  caudal 
  

   region 
  ; 
  Geological 
  Survey 
  Museum, 
  Berlin. 
  

  

  A 
  species 
  of 
  moderate 
  size, 
  attaining 
  a 
  length 
  of 
  about 
  0*5. 
  

   Trunk 
  deeply 
  fusiform, 
  and 
  head 
  with 
  opercular 
  apparatus 
  occupying 
  

   nearly 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish. 
  External 
  bones 
  

   ornamented 
  with 
  very 
  large, 
  closely 
  arranged 
  tuberculations. 
  Fin- 
  

   fulcra 
  very 
  large, 
  but 
  slender 
  ; 
  pelvic 
  fins 
  arising 
  midway 
  between 
  

  

  