﻿316 
  ACTINOPTERYGII. 
  

  

  the 
  total 
  length 
  of 
  the 
  fish. 
  External 
  head- 
  and 
  opercular 
  bones 
  

   and 
  postclavicular 
  scales 
  ornamented 
  with 
  conspicuous 
  coarse 
  rugse 
  

   and 
  tuberculations. 
  Some 
  of 
  the 
  principal 
  scales 
  of 
  the 
  anterior 
  

   series 
  on 
  the 
  flank 
  nearly 
  twice 
  as 
  deep 
  as 
  broad, 
  and 
  those 
  of 
  other 
  

   series 
  also 
  more 
  or 
  less 
  deepened 
  ; 
  most 
  of 
  the 
  scales 
  of 
  the 
  

   abdominal 
  region 
  conspicuously 
  serrated, 
  some 
  of 
  those 
  of 
  the 
  

   caudal 
  region 
  with 
  a 
  few 
  widely-separated 
  posterior 
  denticles. 
  

   Form. 
  Sr 
  Loc. 
  Upper 
  Trias 
  : 
  North 
  Italy. 
  

  

  P. 
  1548. 
  Fish 
  wanting 
  head 
  and 
  having 
  part 
  of 
  the 
  ventral 
  squama- 
  

   tion 
  displaced 
  ; 
  Perledo, 
  Lake 
  of 
  Como. 
  Egerton 
  Coll. 
  

  

  Allolepidotus 
  dorsalis 
  (Kner). 
  

  

  (?) 
  1833-44. 
  Pholidophorus 
  dorsalis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  pp. 
  9, 
  287 
  (inadequately 
  defined). 
  

   1866. 
  Pholidophorus 
  dorsalis, 
  R. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  

   math.-naturw. 
  CI. 
  vol. 
  liv. 
  pt. 
  i. 
  p. 
  324, 
  pi. 
  vi. 
  fig. 
  1. 
  

  

  1866. 
  Semionotus 
  striatus, 
  E. 
  Kner 
  (errore), 
  ibid. 
  p. 
  322, 
  pi. 
  v. 
  fig. 
  1. 
  

  

  1867. 
  Semionotus 
  striatus, 
  R. 
  Kner 
  (errore), 
  loc. 
  cit. 
  vol. 
  lvi. 
  pt. 
  i. 
  p. 
  898, 
  

   pi. 
  i. 
  fig. 
  1. 
  

  

  1867. 
  Pholidophorus 
  dorsalis, 
  R. 
  Kner, 
  ibid. 
  p. 
  903, 
  pi. 
  ii. 
  fig. 
  2. 
  

  

  Type. 
  Imperfect 
  trunk. 
  

  

  A 
  robust 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*14. 
  Length 
  of 
  

   head 
  . 
  with 
  opercular 
  apparatus 
  nearly 
  equalling 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk 
  and 
  contained 
  less 
  than 
  four 
  times 
  in 
  the 
  total 
  

   length 
  of 
  the 
  fish. 
  External 
  head- 
  and 
  opercular 
  bones 
  feebly 
  

   ornamented 
  with 
  coarse 
  rugae 
  and 
  tuberculations. 
  None 
  of 
  the 
  

   scales 
  much 
  deeper 
  than 
  broad 
  ; 
  few 
  of 
  those 
  of 
  the 
  abdominal 
  

   region 
  serrated, 
  nearly 
  all 
  non-serrated 
  and 
  smooth. 
  

  

  Form. 
  § 
  Log. 
  Upper 
  Trias 
  : 
  Tyrol. 
  

  

  21380. 
  Fish 
  wanting 
  head 
  and 
  extremity 
  of 
  caudal 
  fin, 
  but 
  with 
  

   well-preserved 
  squamation 
  ; 
  Seefeld. 
  Purchased, 
  1847. 
  

  

  P. 
  1544. 
  A 
  more 
  imperfectly 
  preserved 
  specimen, 
  showing 
  the 
  

   caudal 
  fin 
  ; 
  Seefeld. 
  Egerton 
  Coll. 
  

  

  16655. 
  A 
  smaller 
  imperfect 
  fish, 
  with 
  some 
  well-preserved 
  scales 
  ; 
  

   Seefeld. 
  Purchased. 
  

  

  Genus 
  PTYCHOLEPIS, 
  Agassiz. 
  

  

  [Neues 
  Jahrb. 
  1832, 
  p. 
  142.] 
  

  

  Trunk 
  elegantly 
  fusiform. 
  Snout 
  acutely 
  pointed 
  and 
  prominent 
  ; 
  

   external 
  head-bones 
  and 
  opercular 
  bones 
  ornamented 
  with 
  prominent 
  

   ridges 
  of 
  ganoine 
  ; 
  marginal 
  teeth 
  comparatively 
  small 
  and 
  stout, 
  

  

  