﻿LEPT0LEPID2E. 
  509 
  

  

  P. 
  937. 
  More 
  fragmentary 
  specimen 
  labelled 
  " 
  Leptolepis 
  costalis 
  " 
  

   by 
  Egerton. 
  Egerton 
  Coll. 
  

  

  P. 
  4364. 
  Three 
  imperfect 
  specimens, 
  one 
  indicating 
  a 
  very 
  large 
  

   fish. 
  Enniskillen 
  Coll. 
  

  

  Leptolepis 
  dubius 
  (Blainville). 
  

  

  [Plate 
  XIY. 
  figs. 
  6, 
  7.] 
  

   1755. 
  Figures 
  by 
  G. 
  W. 
  Knorr, 
  Samml. 
  Merkwiirdigk. 
  Natur, 
  pis. 
  xxiv., 
  

  

  xxvii. 
  

   1818. 
  Clupea 
  dubia, 
  H. 
  D. 
  de 
  Blainville, 
  Nouv. 
  Diet. 
  d'Hist. 
  Nat. 
  

  

  vol. 
  xxvii. 
  p. 
  331. 
  

   1826. 
  Ichthyolithus 
  esociformis,~E. 
  F. 
  Germar, 
  Keferstein's 
  Teutschland 
  

  

  geogn. 
  dargestellt, 
  vol. 
  iv. 
  p. 
  96. 
  

   (?) 
  1826. 
  Ichthyolithus 
  luciiformis, 
  E. 
  F. 
  Germar, 
  ibid. 
  p. 
  96, 
  pi. 
  i. 
  a. 
  

  

  fig. 
  1. 
  

   (?) 
  1826. 
  Esox 
  avirostris, 
  E. 
  F. 
  Germar, 
  ibid. 
  p. 
  95, 
  pi. 
  i. 
  a. 
  fig:. 
  2. 
  

   1833-44. 
  Leptolepis 
  knorrii, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  13 
  ; 
  

  

  pt. 
  ii. 
  pp. 
  134, 
  294 
  (in 
  part). 
  

   1833-44, 
  Leptolepis 
  dubius, 
  L. 
  Agassiz, 
  ibid. 
  pt. 
  i. 
  p. 
  13 
  ; 
  pt. 
  ii. 
  pp. 
  134, 
  

  

  294. 
  

   (?) 
  1848. 
  Tharsis 
  germari, 
  C. 
  G. 
  Giebel, 
  Fauna 
  d. 
  Vorw., 
  Fische, 
  p. 
  146. 
  

  

  [Nearly 
  complete 
  fish 
  ; 
  Halle 
  Museum.] 
  

   (?) 
  1848. 
  Tharsis 
  elongatus, 
  C. 
  G. 
  Giebel, 
  ibid. 
  p. 
  147. 
  [Ditto.] 
  

   (?) 
  1848. 
  Tharsis 
  intermedius, 
  0. 
  G. 
  Giebel, 
  ibid. 
  p. 
  147. 
  [Ditto.] 
  

   1861. 
  Leptolepis 
  clupeiformis, 
  T. 
  C. 
  Winkler, 
  Descript. 
  Poiss. 
  Foss. 
  

  

  Solenhofen 
  (Natuurk. 
  Verhandl. 
  Holland. 
  Maatsch. 
  [2] 
  vol. 
  xiv.), 
  

  

  p. 
  9, 
  fig. 
  1. 
  [Nearly 
  complete 
  fish 
  ; 
  Teyler 
  Museum, 
  Haarlem.] 
  

   1863. 
  Leptolepis 
  knorrii, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  740. 
  

   1888. 
  Leptolepis 
  knorri, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palaeont. 
  vol. 
  iii. 
  

  

  p. 
  271, 
  fig. 
  277. 
  

  

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

  

  A 
  large 
  and 
  robust 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0"3. 
  

   Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maxi- 
  

   mum 
  depth 
  of 
  the 
  trunk 
  and 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  

   fish 
  ; 
  caudal 
  pedicle 
  comparatively 
  narrow, 
  its 
  depth 
  not 
  exceeding 
  

   one-third 
  the 
  maximum 
  depth 
  of 
  the 
  abdominal 
  region. 
  Vertebrae 
  

   about 
  50 
  in 
  number, 
  the 
  centra 
  at 
  least 
  as 
  long 
  as 
  deep 
  and 
  

   slightly 
  strengthened 
  by 
  the 
  addition 
  of 
  small 
  longitudinal 
  ridges 
  of 
  

   secondary 
  bone 
  ; 
  neural 
  and 
  haemal 
  spines 
  in 
  caudal 
  region 
  much 
  

   inclined. 
  Pelvic 
  fins 
  arising 
  much 
  nearer 
  to 
  the 
  anal 
  than 
  to 
  the 
  

   pectorals, 
  and 
  comprising 
  not 
  less 
  than 
  12 
  rays; 
  dorsal 
  with 
  about 
  

   15 
  rays, 
  arising 
  slightly 
  in 
  advance 
  of 
  the 
  pelvic 
  pair 
  and 
  not 
  ex- 
  

   tending 
  so 
  far 
  as 
  a 
  point 
  opposite 
  the 
  comparatively 
  small 
  anal, 
  

   which 
  comprises 
  only 
  about 
  10 
  delicate 
  and 
  closely-arranged 
  rays 
  ; 
  

  

  