﻿MACKOSEMIID^J. 
  175 
  

  

  Part 
  of 
  the 
  cranial 
  roof 
  is 
  shown, 
  and 
  some 
  of 
  the 
  

   superior 
  circumorbital 
  bones 
  are 
  preserved. 
  

  

  Purchased, 
  1889. 
  

  

  P. 
  3614. 
  Part 
  of 
  a 
  trunk 
  with 
  displaced 
  squamation, 
  showing 
  some 
  

   ring-vertebrae 
  immediately 
  behind 
  the 
  position 
  of 
  the 
  

   pelvic 
  fins 
  ; 
  Swanage. 
  Enniskillen 
  Coll. 
  

  

  46421. 
  Imperfect 
  head 
  and 
  portion 
  of 
  trunk 
  ; 
  Tisbury, 
  Wiltshire. 
  

  

  Cunnington 
  Coll. 
  

  

  Histionotus 
  oberndorferi, 
  Wagner. 
  

  

  1863. 
  Histionotus 
  oberndorferi, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  650, 
  pi. 
  iii. 
  

   1887. 
  Histionotus 
  oberndorferi, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Pakeont, 
  

  

  vol. 
  iii. 
  p. 
  218, 
  fig. 
  231. 
  

  

  Type. 
  Imperfect 
  fish, 
  wanting 
  caudal 
  region 
  ; 
  Palaeontological 
  

   Museum, 
  Munich. 
  

  

  An 
  imperfectly 
  known 
  species, 
  differing 
  from 
  H. 
  angularis 
  in 
  the 
  

   more 
  acute 
  angulation 
  of 
  the 
  dorsal 
  margin 
  and 
  in 
  the 
  more 
  

   coarsely 
  serrated 
  character 
  of 
  the 
  scales. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Ximmeridgian 
  (Lithographic 
  Stone) 
  : 
  Ba- 
  

   varia. 
  

  

  49135. 
  Plaster 
  cast 
  of 
  type 
  specimen 
  ; 
  Kelheim. 
  Purchased, 
  1878. 
  

  

  Histionotus 
  falsani, 
  Thiolliere. 
  

  

  1873. 
  Histionotus 
  falsani, 
  V. 
  Thiolliere, 
  Poiss. 
  Eoss. 
  Bugey, 
  pt. 
  ii. 
  

   p. 
  14, 
  pi. 
  v. 
  fig. 
  1. 
  

  

  Type. 
  Much-fractured 
  fish 
  ; 
  Lyons 
  Museum. 
  

  

  A 
  species 
  about 
  equalling 
  the 
  type 
  in 
  size, 
  but 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk 
  considerably 
  exceeding 
  half 
  its 
  length, 
  and 
  the 
  

   head 
  with 
  opercular 
  apparatus 
  at 
  least 
  as 
  deep 
  as 
  long. 
  

  

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

   Ain, 
  Prance. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  An 
  imperfect 
  small 
  fish 
  in 
  the 
  Dresden 
  Museum, 
  from 
  the 
  

   Bavarian 
  Lithographic 
  Stone, 
  is 
  also 
  regarded 
  as 
  indicating 
  a 
  dis- 
  

   tinct 
  species, 
  Histionotus 
  parvus, 
  by 
  B. 
  Yetter, 
  Mittheil. 
  k. 
  mineral.- 
  

   geol. 
  Mus. 
  Dresden, 
  pt. 
  iv. 
  (1881), 
  p. 
  48, 
  pi. 
  ii. 
  fig. 
  5. 
  

  

  