﻿304 
  ACTTNOPTERYGII. 
  

  

  but 
  smooth 
  in 
  the 
  caudal 
  region. 
  The 
  squamation 
  is 
  too 
  

   much 
  disturbed 
  both 
  dorsally 
  and 
  ventrally 
  to 
  exhibit 
  the 
  

   precise 
  form 
  and 
  proportions 
  of 
  the 
  trunk. 
  Egerton 
  Coll. 
  

  

  P. 
  867. 
  Small 
  slab 
  of 
  Lias 
  with 
  imperfect 
  clavicle 
  and 
  specifically 
  

   indeterminable 
  scales, 
  labelled 
  Eugnathus 
  ornatus 
  by 
  

   Agassiz, 
  and 
  perhaps 
  intended 
  to 
  be 
  the 
  type 
  specimen 
  of 
  

   this 
  undefined 
  species 
  (Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  1844, 
  

   p. 
  105) 
  ; 
  Lower 
  Lias, 
  Lyme 
  Regis. 
  Egerton 
  Coll. 
  

  

  P. 
  866. 
  Fragmentary 
  remains 
  of 
  small 
  head 
  and 
  trunk, 
  showing 
  

   ceratohyals 
  and 
  vertebral 
  axis 
  ; 
  Lower 
  Lias, 
  Lyme 
  Regis. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  1048. 
  Abraded 
  and 
  imperfect 
  small 
  head 
  and 
  abdominal 
  region 
  ; 
  

   Lower 
  Lias, 
  Watch 
  et, 
  Somersetshire. 
  Egerton 
  Coll. 
  

  

  The 
  specific 
  names 
  leptodus 
  and 
  mandibulars 
  were 
  also 
  proposed 
  

   by 
  Agassiz 
  for 
  forms 
  of 
  Eugnathus 
  to 
  which 
  there 
  is 
  now 
  no 
  clue 
  

   (Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  1844, 
  p. 
  105, 
  names 
  only), 
  from 
  the 
  

   Lower 
  Lias 
  of 
  Lyme 
  Regis. 
  

  

  The 
  so-called 
  Fholidophorus 
  elongatus 
  (A. 
  "Wagner, 
  Abh. 
  k. 
  bay. 
  

   Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  vol. 
  ix. 
  1863, 
  p. 
  664) 
  from 
  the 
  Litho- 
  

   graphic 
  Stone 
  of 
  Solenhofen, 
  is 
  also 
  probably 
  a 
  species 
  of 
  Eugnathus. 
  

  

  The 
  type 
  specimen 
  is 
  in 
  the 
  Palaeontological 
  Museum, 
  Munich. 
  

  

  Genus 
  HETEROLEPIDOTUS, 
  Egerton. 
  

  

  [Figs. 
  & 
  Descript. 
  Brit. 
  Organic 
  Remains, 
  dec. 
  xiii. 
  (Mem. 
  

   Geol. 
  Surv. 
  1872), 
  no. 
  2 
  ] 
  

  

  Syn. 
  Brachyichthys, 
  T. 
  C. 
  Winkler, 
  Descript. 
  Poiss. 
  Foss. 
  Solenhofen 
  

   (Natuurk. 
  Verhandl. 
  Holland. 
  Maatsch. 
  [2] 
  vol. 
  xiv. 
  1861), 
  p. 
  47. 
  

   Eulepidotus, 
  Sir 
  P. 
  Egerton, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxiv. 
  

   1868, 
  p. 
  505 
  \ 
  

  

  A 
  genus 
  scarcely 
  distinguishable 
  from 
  Eugnathus, 
  but 
  having 
  the 
  

   trunk 
  more 
  deeply 
  fusiform, 
  the 
  marginal 
  teeth 
  relatively 
  smaller, 
  

   and 
  ossified 
  hemivertebras 
  present 
  in 
  all 
  but 
  the 
  smallest 
  species. 
  

   Principal 
  flank-scales 
  serrated, 
  usually 
  not 
  pectinated. 
  

  

  Heterolepidotus 
  latus, 
  Egerton. 
  

  

  1834-35. 
  Dapedius 
  ftmbriatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss., 
  Feuill. 
  p. 
  9, 
  and 
  

   vol. 
  ii. 
  pt. 
  i. 
  p. 
  196. 
  

  

  1 
  Withdrawn 
  in 
  1872, 
  loc. 
  cit., 
  Sauvage 
  having 
  named 
  typical 
  species 
  of 
  

   Lepidotus 
  " 
  Eulepidota" 
  in 
  1867 
  (Catal. 
  Poiss. 
  Form. 
  Second. 
  Boulonnais, 
  

   p. 
  20). 
  

  

  