﻿84 
  ACTINOPTERYGII. 
  

  

  Lepidotus 
  elvensis 
  (Blainville). 
  

  

  1818. 
  Cyprinus 
  elvensis, 
  H. 
  D. 
  de 
  Blainville, 
  Nouv. 
  Diet. 
  d'Hist. 
  Nat. 
  

  

  vol. 
  xxvii. 
  p. 
  394. 
  

   1830. 
  " 
  Fossil 
  fish," 
  G. 
  Baker, 
  Hist. 
  Northampton, 
  vol. 
  i. 
  p. 
  440, 
  with 
  

  

  plate. 
  

   1832. 
  Lepidotes 
  gigas, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  145. 
  

   1833-37. 
  Lepidotus 
  gigas, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  pp. 
  8, 
  235, 
  

  

  pis. 
  xxviii., 
  xxix. 
  [Head, 
  etc. 
  ; 
  Stuttgart 
  Museum.] 
  

   1843. 
  Lepidotus 
  elvensis, 
  F. 
  A. 
  Quenstedt, 
  Flozgeb. 
  Wiirttemb. 
  p. 
  228. 
  

   1847. 
  Lepidotus 
  elvensis, 
  F. 
  A. 
  Quenstedt, 
  Ueber 
  Lepidotus 
  im 
  Lias 
  e, 
  

  

  with 
  plates. 
  

   1886. 
  Lepidotus 
  gigas, 
  B. 
  Thompson, 
  Journ. 
  Northampton. 
  Nat. 
  Hist. 
  

  

  Soc. 
  vol. 
  iv. 
  p. 
  27, 
  with 
  plate. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Paris 
  Museum 
  of 
  Natural 
  History. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*75. 
  Head 
  with 
  

   opercular 
  apparatus 
  occupying 
  about 
  one-quarter 
  of 
  the 
  total 
  length 
  ; 
  

   maximum 
  depth 
  of 
  trunk 
  contained 
  not 
  much 
  more 
  than 
  three 
  times 
  

   in 
  the 
  total 
  length. 
  External 
  bones 
  nearly 
  smooth, 
  but 
  in 
  part 
  

   with 
  sparsely-arranged 
  coarse 
  tuberculations 
  ; 
  parietal 
  bones 
  much 
  

   less 
  than 
  half 
  as 
  long 
  as 
  the 
  frontals, 
  which 
  are 
  nearly 
  three 
  times 
  

   as 
  long 
  as 
  their 
  maximum 
  width, 
  narrow 
  in 
  front, 
  and 
  united 
  by 
  a 
  

   slightly 
  wavy 
  median 
  suture 
  ; 
  mandibular 
  symphysis 
  comparatively 
  

   narrow. 
  Marginal 
  teeth 
  acuminate, 
  not 
  less 
  than 
  three 
  times 
  as 
  

   deep 
  as 
  broad. 
  Operculum 
  two-thirds 
  as 
  broad 
  as 
  deep, 
  and 
  its 
  

   maximum 
  breadth 
  equalling 
  somewhat 
  less 
  than 
  one-half 
  the 
  length 
  

   of 
  the 
  head. 
  Fin-fulcra 
  moderately 
  developed; 
  dorsal 
  and 
  anal 
  

   fins 
  deeper 
  than 
  long. 
  Scales 
  smooth, 
  the 
  principal 
  flank-scales 
  

   slightly 
  deeper 
  than 
  broad, 
  with 
  a 
  few 
  coarse 
  serrations 
  upon 
  the 
  

   inferior 
  half 
  of 
  the 
  hinder 
  border. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Lias 
  : 
  Bavaria, 
  "Wiirtemberg, 
  and 
  N. 
  France 
  ; 
  

   Somersetshire 
  and 
  Northamptonshire. 
  

  

  P. 
  7406. 
  Fish, 
  wanting 
  all 
  the 
  fins 
  and 
  the 
  external 
  surface 
  of 
  most 
  

   of 
  the 
  scales 
  and 
  head-bones 
  ; 
  probably 
  from 
  Wiirtemberg. 
  

   The 
  cranial 
  roof 
  and 
  all 
  the 
  facial 
  bones 
  of 
  the 
  right 
  side, 
  

   except 
  those 
  bordering 
  the 
  mouth, 
  are 
  well 
  displayed 
  ; 
  

   and 
  there 
  are 
  recognizable 
  remains 
  of 
  the 
  opercular 
  

   apparatus 
  and 
  pectoral 
  arch. 
  

  

  19662. 
  Bemains 
  of 
  head 
  and 
  trunk, 
  displaying 
  the 
  circumorbitals, 
  

   suborbitals, 
  preoperculum, 
  and 
  interoperculum 
  of 
  the 
  right 
  

   side, 
  with 
  portions 
  of 
  the 
  anal 
  and 
  caudal 
  fins 
  ; 
  Boll, 
  

   Wiirtemberg. 
  Purchased, 
  1845. 
  

  

  P. 
  7407. 
  Imperfectly 
  preserved 
  fish, 
  wanting 
  the 
  anterior 
  portion 
  

   of 
  the 
  head 
  and 
  all 
  the 
  fins, 
  except 
  fragments 
  of 
  the 
  

  

  