﻿1864.] 
  KIBKBY 
  PERMIAN 
  PISH 
  AND 
  PLANTS. 
  355 
  

  

  in 
  having 
  a 
  large 
  operculum, 
  scales 
  that 
  vary 
  more 
  in 
  size, 
  and 
  in 
  

   having 
  them 
  with 
  plain 
  margins, 
  while 
  P. 
  glaphyrus 
  has 
  them 
  deeply 
  

   serrated. 
  P. 
  glaphyrus, 
  moreover, 
  does 
  not 
  appear 
  to 
  have 
  possessed 
  

   the 
  large 
  notched 
  scales 
  that 
  mark 
  the 
  lateral 
  line 
  in 
  P. 
  varians. 
  

   With 
  these 
  differences 
  before 
  me, 
  I 
  have 
  not 
  hesitated 
  to 
  describe 
  

   the 
  present 
  form 
  as 
  a 
  distinct 
  species. 
  

  

  P. 
  varians 
  has 
  occurred 
  in 
  the 
  laminated 
  marls 
  at 
  the 
  base 
  of 
  the 
  

   Upper 
  Limestone, 
  in 
  the 
  strata 
  immediately 
  underlying 
  the 
  Fish- 
  

   bed, 
  in 
  the 
  Dun 
  Stone, 
  and 
  in 
  the 
  Main 
  or 
  Honeycomb 
  Stone 
  in 
  

   the 
  New 
  Quarry 
  at 
  Fulwell 
  ; 
  also 
  in 
  the 
  Fish-bed 
  in 
  the 
  Old 
  Quarry, 
  

   Fulwell. 
  And 
  the 
  fragment 
  of 
  a 
  Fish 
  that 
  I 
  met 
  with 
  in 
  the 
  lami- 
  

   nated 
  limestone 
  of 
  Marsden 
  apparently 
  belongs 
  to 
  this 
  species. 
  

  

  Pal^oniscus 
  Abbsii, 
  Kirkby. 
  PI. 
  XYIII. 
  figs. 
  3a, 
  36. 
  

   Annals 
  of 
  Nat. 
  Hist. 
  3 
  ser. 
  vol. 
  ix. 
  p. 
  268. 
  

  

  Length 
  from 
  snout 
  to 
  end 
  of 
  caudal 
  fin 
  rather 
  more 
  than 
  4 
  inches; 
  

   length 
  of 
  body 
  3-| 
  inches. 
  Greatest 
  width, 
  which 
  is 
  a 
  little 
  in 
  

   advance 
  of 
  the 
  ventral 
  fin, 
  -| 
  inch 
  ; 
  from 
  this 
  point 
  the 
  body 
  con- 
  

   tracts 
  gradually 
  to 
  -^ 
  inch. 
  From 
  these 
  measurements 
  it 
  will 
  

   be 
  seen 
  that 
  this 
  species 
  is 
  an 
  elongated 
  form, 
  the 
  length 
  of 
  body 
  

   being 
  nearly 
  six 
  times 
  the 
  maximum 
  width. 
  

  

  The 
  head 
  is 
  an 
  inch 
  in 
  length, 
  and 
  half 
  an 
  inch 
  in 
  breadth. 
  The 
  

   fins 
  are 
  of 
  moderate 
  size. 
  The 
  pectorals 
  are 
  about 
  -f-^ 
  inch 
  in 
  

   length, 
  and 
  consist 
  apparently 
  of 
  about 
  20 
  slender 
  rays, 
  with 
  two 
  

   short 
  spine-like 
  rays 
  in 
  front. 
  The 
  ventrals, 
  which 
  are 
  compara- 
  

   tively 
  small, 
  are 
  situated 
  1-J 
  inch 
  from 
  the 
  snout 
  ; 
  the 
  anal 
  is 
  2 
  J 
  

   inches 
  from 
  the 
  snout 
  ; 
  and 
  the 
  dorsal 
  is 
  placed 
  midway 
  between 
  

   the 
  ventrals 
  and 
  the 
  anal, 
  or 
  2\ 
  inches 
  from 
  the 
  snout. 
  Of 
  the 
  anal 
  

   and 
  dorsal, 
  the 
  latter 
  is 
  the 
  larger 
  ; 
  but 
  none 
  of 
  the 
  specimens 
  found 
  

   show 
  either 
  these 
  fins 
  or 
  the 
  ventrals 
  in 
  a 
  condition 
  that 
  permits 
  the 
  

   rays 
  to 
  be 
  counted. 
  The 
  caudal 
  fin 
  springs 
  from 
  a 
  tail 
  apparently 
  more 
  

   heterocercal 
  than 
  in 
  P. 
  varians 
  ; 
  it 
  consists 
  of 
  15 
  or 
  16 
  stout 
  rays, 
  that 
  

   are 
  margined 
  on 
  each 
  lobe 
  by 
  numerous 
  pointed 
  fulcral 
  scales. 
  

  

  The 
  scales 
  resemble 
  those 
  of 
  P. 
  varians, 
  except 
  in 
  being 
  longer 
  

   compared 
  with 
  their 
  breadth. 
  They 
  are 
  arranged 
  in 
  more 
  inclined 
  

   dorso-ventral 
  series 
  than 
  in 
  P. 
  varians, 
  and 
  there 
  are 
  about 
  12 
  in 
  

   each 
  series; 
  but 
  the 
  scales 
  are 
  generally 
  so 
  much 
  dislocated 
  and 
  

   confused 
  as 
  to 
  render 
  their 
  numeration 
  a 
  matter 
  of 
  difficulty. 
  

  

  The 
  distinguishing 
  feature 
  of 
  this 
  Fish 
  is 
  its 
  elongated 
  form 
  ; 
  

   and, 
  except 
  in 
  being 
  so 
  much 
  longer, 
  it 
  differs 
  little 
  from 
  the 
  pre- 
  

   ceding 
  species. 
  

  

  From 
  another 
  elongated 
  form 
  of 
  the 
  same 
  genus, 
  P. 
  longissimus, 
  

   Ag\, 
  it 
  differs 
  in 
  having 
  much 
  larger 
  scales, 
  and 
  in 
  their 
  being 
  smooth 
  

   and 
  unserrated 
  at 
  the 
  margin; 
  also 
  in 
  the 
  relative 
  position 
  of 
  the 
  

   dorsal 
  and 
  ventral 
  fins 
  being 
  different 
  in 
  the 
  two 
  species. 
  From 
  

   P. 
  KabliJcce, 
  another 
  elongate 
  Permian 
  species, 
  described 
  by 
  Dr. 
  

   Geinitz, 
  it 
  differs 
  in 
  having 
  a 
  much 
  blunter 
  snout 
  and 
  smaller 
  fins, 
  

   as 
  well 
  as 
  in 
  a 
  less 
  elegant 
  general 
  form. 
  

  

  Examples, 
  chiefly 
  fragments 
  of 
  about 
  half-a-dozen 
  individuals, 
  

   have 
  occurred 
  in 
  the 
  Fish-bed 
  of 
  the 
  Old 
  Quarry 
  at 
  Fulwell. 
  

  

  