﻿POLYODONTID^!. 
  47 
  

  

  Crossopholis 
  magnicaudatus, 
  Cope. 
  

   1883. 
  Crassopholis 
  magnicaudatuy, 
  E. 
  D. 
  Cope, 
  Amer. 
  Nat. 
  vol. 
  xvii. 
  

   p. 
  1153. 
  / 
  

  

  1885. 
  Crossopholis 
  magnicaudatus, 
  E. 
  D. 
  Cope, 
  ibid. 
  vol. 
  xix. 
  p. 
  1090. 
  

  

  1886. 
  Ci-ossopholis 
  magnicaudatus, 
  E. 
  D. 
  Cope, 
  Mem. 
  National 
  Acad. 
  

   Sci. 
  vol. 
  iii. 
  p. 
  161, 
  pi. 
  with 
  figs. 
  1-3. 
  

  

  Type. 
  Portion 
  of 
  trunk. 
  ' 
  

  

  The 
  type 
  species, 
  with 
  rostrum 
  relatively 
  shorter 
  than 
  in 
  Polyodon 
  

   folium, 
  and 
  the 
  operculum 
  larger./ 
  Bases 
  of 
  the 
  teeth 
  round 
  and 
  

   closely 
  apposed. 
  Dorsal 
  fin-supports 
  16-18 
  in 
  number, 
  and 
  rays 
  

   probably 
  24. 
  Scales 
  subquadrate 
  and 
  more 
  widely 
  separated 
  

   anterior 
  to 
  the 
  dorsal 
  fin 
  than 
  posterior 
  to 
  it. 
  

  

  Measurements 
  of 
  type 
  specimen 
  : 
  — 
  Length 
  from 
  notch 
  of 
  caudal 
  

   fin 
  to 
  line 
  of 
  origin 
  or 
  dorsal, 
  0*17 
  ; 
  depth 
  at 
  origin 
  of 
  anal, 
  0-06; 
  

   depth 
  of 
  caudal 
  pedicle, 
  0*035 
  ; 
  length 
  of 
  inferior 
  caudal 
  lobe, 
  0*11 
  ; 
  

   depth 
  and,diameter 
  of 
  scales 
  about 
  0*001 
  {Cope). 
  

  

  Forms 
  Sf 
  Log. 
  Eocene 
  : 
  Wyoming, 
  U.S.A. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Genus 
  PHOLIDURUS, 
  A. 
  S. 
  Woodward. 
  

   [Proc. 
  Geol. 
  Assoc, 
  vol. 
  xi. 
  1889, 
  p. 
  31.] 
  

  

  A 
  provisional 
  name 
  applied 
  to 
  a 
  Cretaceous 
  Chondrostean 
  fish 
  

   known 
  only 
  by 
  a 
  portion 
  of 
  the 
  tail. 
  The 
  caudal 
  fulcral 
  scales 
  

   much 
  resemble 
  those 
  of 
  Psephurus, 
  but 
  are 
  broader 
  and 
  flatter, 
  less 
  

   pointed, 
  and 
  evidently 
  indicate 
  a 
  stout 
  depressed 
  fish. 
  The 
  caudal 
  

   fin-rays 
  are 
  ornamented 
  with 
  ganoine. 
  

  

  Pholidurus 
  disjectus, 
  A. 
  S. 
  Woodward. 
  

  

  1889. 
  Pholidurus 
  disjectus, 
  A. 
  S. 
  Woodward, 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  xi. 
  

   p. 
  31, 
  pi. 
  i. 
  figs. 
  4, 
  5. 
  

  

  Type. 
  Portion 
  of 
  tail 
  ; 
  British 
  Museum. 
  

  

  The 
  type 
  species, 
  known 
  only 
  by 
  the 
  fragment 
  mentioned 
  below. 
  

   Caudal 
  fulcral 
  scales 
  very 
  flat, 
  with 
  rounded 
  and 
  obtuse 
  apex 
  ; 
  

   their 
  exposed 
  surface 
  ornamented 
  with 
  thick 
  ganoine 
  in 
  irregular 
  

   dots 
  and 
  short 
  wavy 
  lines, 
  more 
  or 
  less 
  clustered, 
  especially 
  near 
  

   the 
  margin. 
  Caudal 
  fin-rays 
  very 
  robust, 
  the 
  superficial 
  ganoine 
  

   thick 
  and 
  rugose, 
  not 
  always 
  completely 
  covering 
  the 
  exposed 
  faces 
  

   of 
  the 
  successive 
  joints. 
  

  

  It 
  is 
  still 
  uncertain 
  whether 
  or 
  not 
  the 
  portion 
  of 
  a 
  depressed 
  

   rostrum 
  described, 
  loc. 
  cit. 
  p. 
  31, 
  pi. 
  i. 
  fig. 
  6, 
  belongs 
  to 
  this 
  fish. 
  

   Having 
  made 
  a 
  renewed 
  examination 
  of 
  the 
  Jurassic 
  Ccelacanths 
  at 
  

  

  