﻿232 
  ACTINOPTEKYGII. 
  

  

  fig. 
  6. 
  — 
  Kimmeridgian 
  ; 
  Chaux-du-Milieu, 
  Neuchatel. 
  

   [Portion 
  of 
  vomer 
  ; 
  Neuchatel 
  Museum.] 
  

  

  Microdon 
  formosus, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  Wiss., 
  math.- 
  

   naturw. 
  CI. 
  vol. 
  xi. 
  (1856), 
  p. 
  201. 
  Pycnodus 
  formosus, 
  A. 
  

   Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  vol. 
  vi. 
  

   (1851), 
  p. 
  40, 
  pl.iii. 
  fig. 
  4. 
  — 
  Lower 
  Kimmeridgian 
  (Diceras- 
  

   kalk) 
  ; 
  Oberau, 
  near 
  Kelheim, 
  Bavaria. 
  [Portion 
  of 
  right 
  

   splenial 
  ; 
  Palseontological 
  Museum, 
  Munich.] 
  

  

  Microdon 
  irregularis 
  : 
  PyJcnodus 
  irregularis, 
  F. 
  A. 
  Quenstedt, 
  Der 
  

   Jura 
  (1858), 
  p. 
  781, 
  pi. 
  xcvi. 
  fig. 
  32 
  \— 
  Upper 
  Corallian; 
  

   Schnaitheim, 
  Wiirtemberg. 
  [Portion 
  of 
  vomer 
  ; 
  Tiibingen 
  

   University 
  Museum.] 
  

  

  Microdon 
  (?) 
  minor 
  ; 
  Pycnodus 
  minor, 
  F. 
  A. 
  Roemer, 
  Verstein. 
  

   Norddeutsch. 
  Oolithengeb., 
  Nachtr. 
  (1839), 
  p. 
  54.— 
  

   Portlandian 
  ; 
  Galgenberg, 
  near 
  Hildesheim, 
  Hanover. 
  

   [Splenial.] 
  

  

  Microdon 
  vicinus 
  : 
  Pycnodus 
  vicinus, 
  J. 
  Cornuel, 
  Bull. 
  Soc. 
  Geol. 
  

   Prance, 
  [3] 
  vol. 
  xi. 
  (1883), 
  p. 
  20, 
  pi. 
  i. 
  figs. 
  8, 
  9.— 
  Port- 
  

   landian 
  ; 
  Ville-sur-Saulx, 
  Meuse. 
  [Splenial.] 
  

  

  An 
  undefined 
  species 
  of 
  Microdon 
  is 
  also 
  indicated 
  by 
  imperfect 
  

   jaws 
  from 
  the 
  Lower 
  Kimmeridgian 
  of 
  Orbagnoux, 
  Ain, 
  France 
  

   (Pycnodus 
  sp., 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Hist. 
  Nat. 
  Autun, 
  vol. 
  vi. 
  

   1893, 
  p. 
  443, 
  pi. 
  ix. 
  fig. 
  2). 
  

  

  The 
  genus 
  has 
  been 
  erroneously 
  recorded 
  from 
  the 
  Cretaceous. 
  

   The 
  so-called 
  Microdon 
  nuchalis 
  (F. 
  Dixon, 
  Geol. 
  Sussex, 
  1850, 
  

   p. 
  369, 
  pi. 
  xxxii. 
  fig. 
  7) 
  is 
  founded 
  upon 
  an 
  imperfect 
  example 
  of 
  a 
  

   teleostean 
  fish 
  from 
  the 
  Chalk 
  of 
  Sussex, 
  now 
  in 
  the 
  British 
  Museum 
  

   {Platax 
  ? 
  nuchalis, 
  A. 
  S. 
  Woodward, 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  [5] 
  

   vol. 
  xx. 
  1887, 
  p. 
  342). 
  Microdon 
  occipitalis 
  (F. 
  Dixon, 
  op. 
  cit. 
  

   p. 
  369, 
  pi. 
  xxxii*. 
  fig. 
  2) 
  is 
  a 
  name 
  given 
  to 
  a 
  generically 
  indeter- 
  

   minable 
  fragment 
  of 
  a 
  Pycnodont 
  from 
  the 
  Chalk 
  of 
  Lewes, 
  in 
  the 
  

   Brighton 
  Museum. 
  

  

  Microdon 
  ? 
  pulchellus 
  (J. 
  W. 
  Davis, 
  Trans. 
  Eoy. 
  Dublin 
  Soc. 
  [2] 
  

   vol. 
  iii. 
  1887, 
  p. 
  501, 
  pi. 
  xxiv. 
  fig. 
  3), 
  from 
  the 
  Upper 
  Cretaceous 
  of 
  

   Sahel 
  Alma, 
  Mt. 
  Lebanon, 
  is 
  a 
  teleostean 
  fish. 
  The 
  type 
  specimen 
  

   is 
  now 
  in 
  the 
  Edinburgh 
  Museum. 
  

  

  An 
  indeterminable 
  fossil 
  from 
  the 
  Cretaceous 
  of 
  Pietraroja, 
  Naples, 
  

   is 
  named 
  Microdon 
  simplex, 
  O. 
  G. 
  Costa, 
  Atti 
  Accad. 
  Pontan. 
  

   vol. 
  viii. 
  (1864), 
  p. 
  112, 
  pi. 
  ix. 
  fig. 
  7. 
  

  

  1 
  An 
  Eocene 
  fossil 
  from 
  Bavaria, 
  certainly 
  not 
  of 
  this 
  species 
  is 
  recorded 
  

   under 
  the 
  same 
  name 
  by 
  K. 
  Schafhautl, 
  Sud-Bayerns 
  Leth. 
  Geogn. 
  (1863), 
  p. 
  246 
  

   pi. 
  lxv. 
  c. 
  fig. 
  16. 
  

  

  