﻿OLIGOPLEURID.E. 
  495 
  

  

  long 
  as 
  deep, 
  and 
  the 
  side 
  of 
  each 
  exhibiting 
  a 
  median 
  longitudinal 
  

   ridge 
  with 
  a 
  deep 
  pit 
  above 
  and 
  below 
  ; 
  ribs 
  robust, 
  but 
  short. 
  

   Fin-rays 
  robust, 
  all 
  closely 
  articulated 
  and 
  divided 
  at 
  some 
  distance 
  

   from 
  the 
  base 
  ; 
  fulcra 
  conspicuous 
  on. 
  the 
  median 
  fins. 
  Dorsal 
  and 
  

   anal 
  fins 
  short-based, 
  the 
  former 
  almost 
  or 
  completely 
  in 
  advance 
  of 
  

   the 
  latter 
  ; 
  caudal 
  fin 
  much 
  forked. 
  Scales 
  large. 
  

  

  Oeonoscopus 
  petraroise, 
  Costa. 
  

  

  1853. 
  lonoscopus 
  petraroice, 
  0. 
  G. 
  Costa, 
  Ittiol. 
  Foss. 
  Ital. 
  p. 
  2, 
  pi. 
  i. 
  

   1864. 
  Oeonoscopus 
  petraroice, 
  0. 
  G. 
  Costa, 
  Atti 
  Accad. 
  Pontan. 
  vol. 
  viii. 
  

  

  p. 
  59, 
  pi. 
  viii. 
  

   1882. 
  Oeonoscopus 
  petraroice, 
  F. 
  Bassani, 
  Denkschr. 
  k. 
  Akad. 
  Wiss., 
  

  

  math.-naturw. 
  CI. 
  vol. 
  xlv. 
  p. 
  240. 
  

  

  Type. 
  Imperfect 
  fish 
  ; 
  Geological 
  Museum, 
  University 
  of 
  Naples. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*7, 
  known 
  only 
  by 
  

   a 
  fragmentary 
  specimen 
  which 
  seems 
  to 
  have 
  a 
  somewhat 
  deeper 
  

   abdominal 
  region 
  than 
  the 
  next 
  species, 
  also 
  differing 
  from 
  the 
  

   latter 
  in 
  the 
  stouter 
  teeth 
  and 
  slightly 
  more 
  forward 
  position 
  of 
  the 
  

   dorsal 
  fin. 
  

  

  Form. 
  Sf 
  Log. 
  Cretaceous 
  : 
  Pietraroja, 
  Province 
  of 
  Benevento, 
  

   Italy. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  The 
  original 
  specimen 
  at 
  Naples 
  is 
  covered 
  with 
  large 
  cycloidal 
  

   scales, 
  and 
  these 
  are 
  ornamented 
  in 
  the 
  exposed 
  portion 
  with 
  deli- 
  

   cate, 
  parallel 
  horizontal 
  lines, 
  which 
  sometimes 
  seem 
  to 
  terminate 
  at 
  

   the 
  hinder 
  margin 
  in 
  fine 
  serrations. 
  The 
  teeth 
  are, 
  as 
  shown 
  by 
  

   Costa, 
  enamelled 
  at 
  the 
  tip 
  ; 
  but 
  the 
  crimping 
  of 
  the 
  crown 
  of 
  the 
  

   two 
  hinder 
  teeth 
  is 
  not 
  quite 
  so 
  conspicuous 
  as 
  indicated 
  in 
  Costa's 
  

   figure. 
  The 
  operculum 
  is 
  much 
  deeper 
  than 
  broad, 
  and 
  the 
  bran- 
  

   chiostegal 
  rays 
  are 
  slender. 
  The 
  dorsal 
  fin 
  exhibits 
  biserial 
  fulcra, 
  

   and 
  all 
  the 
  other 
  fins 
  are 
  seen 
  to 
  be 
  fulcrated, 
  except 
  the 
  pectorals 
  

   which 
  are 
  too 
  much 
  crushed. 
  The 
  dorsal 
  fin 
  exhibits 
  at 
  least 
  24, 
  

   while 
  the 
  anal 
  has 
  only 
  about 
  12 
  supports. 
  

  

  Oeonoscopus 
  cyprinoides 
  (Wagner). 
  

  

  1863. 
  Oligoplearus 
  cyprinoides, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  721, 
  pi. 
  vi. 
  

   1887. 
  Oenoscopus 
  cyprinoides 
  [misprinted 
  esocinus], 
  K. 
  A. 
  von 
  Zittel, 
  

  

  Handb. 
  Palaeont. 
  vol. 
  iii. 
  p. 
  232. 
  

  

  Type. 
  Fish, 
  wanting 
  head 
  ; 
  Pala3ontological 
  Museum, 
  Munich. 
  

   A 
  species 
  nearly 
  as 
  large 
  as 
  the 
  type. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  nearly 
  equal 
  to 
  the 
  maximum 
  depth 
  of 
  the 
  

  

  