﻿202 
  ACTINOPTEKYGII. 
  

  

  P. 
  4381. 
  Nearly 
  complete 
  fish 
  0*13 
  in 
  length, 
  wanting 
  the 
  paired 
  

   fins 
  ; 
  Purbeck 
  Beds, 
  Swanage. 
  Enniskillen 
  Coll. 
  

  

  Mesodon 
  simus, 
  

  

  1893. 
  Mesodon 
  simus, 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Hist. 
  Nat. 
  Autun, 
  

   vol. 
  vi. 
  p. 
  441. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  A 
  species 
  described 
  by 
  Sauvage 
  as 
  closely 
  resembling 
  M. 
  daviesi, 
  

   but 
  differing 
  in 
  the 
  somewhat 
  more 
  elongated 
  form 
  of 
  its 
  trunk. 
  

   Form. 
  6f 
  Log. 
  Lower 
  Kimraeridgian 
  : 
  Orbagnoux, 
  Ain, 
  France. 
  

   Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Mesodon 
  comosus, 
  Thiolliere. 
  

  

  1858. 
  Mesodon 
  comosus, 
  V. 
  Thiolliere, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  [2] 
  

  

  vol. 
  xv. 
  p. 
  783 
  (name 
  only). 
  

   1873. 
  Mesodon 
  comosus, 
  P. 
  Gervais, 
  in 
  V. 
  Thiolliere, 
  Poiss. 
  Foss. 
  

  

  Bugey, 
  pt. 
  ii. 
  p. 
  13, 
  pi. 
  ii. 
  fig. 
  1. 
  

  

  Type. 
  Fish, 
  wanting 
  head 
  ; 
  Lyons 
  Museum. 
  

  

  A 
  species 
  as 
  large 
  as 
  M. 
  daviesi, 
  distinguished 
  from 
  all 
  known 
  

   forms 
  by 
  its 
  remarkably 
  short 
  and 
  deep 
  dorsal 
  and 
  anal 
  fins. 
  

   Dorsal 
  fin 
  with 
  about 
  27, 
  anal 
  fin 
  with 
  not 
  less 
  than 
  22 
  rays. 
  

   Squamation 
  covering 
  much 
  more 
  than 
  half 
  of 
  the 
  trunk. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Cirin, 
  

   Ain, 
  France. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Mesodon 
  liassicus 
  (Egerton). 
  

  

  1854. 
  Pycnodus 
  liassicus, 
  Sir 
  P. 
  Egerton, 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  [2] 
  

   vol. 
  xiii. 
  p. 
  436. 
  

  

  1855. 
  Pycnodus 
  liassicus, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript. 
  Brit. 
  

   Organic 
  Remains 
  (Mem. 
  Geol. 
  Surv.), 
  dec. 
  viii. 
  no. 
  10, 
  pi. 
  x. 
  

  

  1856. 
  Mesodon 
  liassicus, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  Wiss., 
  

   math.-naturw. 
  CI. 
  vol. 
  xi. 
  p. 
  202. 
  

  

  Type. 
  Imperfect 
  fish 
  ; 
  British 
  Museum. 
  

  

  An 
  imperfectly 
  known 
  small 
  species, 
  about 
  0*13 
  in 
  length. 
  

   Maximum 
  depth 
  of 
  the 
  trunk 
  less 
  than 
  the 
  length 
  of 
  the 
  head 
  and 
  

   trunk 
  without 
  caudal 
  fin. 
  Teeth 
  smooth. 
  Ornamentation 
  of 
  scales 
  

   and 
  external 
  bones 
  consisting 
  of 
  closely 
  arranged, 
  large, 
  flattened 
  

   tubercles. 
  

  

  Form. 
  <$f 
  Loc. 
  Lower 
  Lias 
  : 
  Leicestershire, 
  Somersetshire, 
  and 
  

   Gloucestershire. 
  

  

  19864. 
  Type 
  specimen 
  ; 
  Barrow- 
  on-Soar, 
  Leicestershire. 
  

  

  Purchased. 
  1846. 
  

  

  