﻿392 
  ACTINOPTERYGII. 
  

  

  bones 
  finely 
  granulated. 
  Pelvic 
  fins 
  arising 
  much 
  nearer 
  to 
  the 
  

   pectorals 
  than 
  to 
  the 
  anal 
  fin. 
  Dorsal 
  fin 
  with 
  about 
  24 
  rays 
  ; 
  anal 
  

   with 
  nearly 
  50 
  rays. 
  Scales 
  smooth. 
  

  

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

   Bavaria. 
  

  

  49144. 
  Plaster 
  cast 
  of 
  type 
  specimen 
  ; 
  Solenhofen. 
  

  

  Purchased, 
  1878. 
  

  

  P. 
  6942. 
  A 
  nearly 
  complete 
  fish 
  about 
  0*75 
  in 
  total 
  length 
  ; 
  Eich- 
  

   stiidt. 
  The 
  head 
  is 
  obscure, 
  but 
  some 
  of 
  the 
  large 
  

   mandibular 
  teeth 
  are 
  shown 
  and 
  parts 
  of 
  the 
  external 
  

   bones 
  are 
  distinctly 
  ornamented 
  with 
  very 
  fine 
  tubercles. 
  

   The 
  axial 
  skeleton 
  of 
  the 
  trunk 
  is 
  well 
  preserved 
  and 
  

   there 
  are 
  no 
  traces 
  of 
  ossifications 
  in 
  the 
  notochordal 
  

   sheath. 
  There 
  are 
  at 
  least 
  120 
  segments. 
  In 
  the 
  abdo- 
  

   minal 
  region 
  the 
  two 
  halves 
  of 
  the 
  long 
  neural 
  arches 
  are 
  

   separate 
  both 
  from 
  each 
  other 
  and 
  from 
  the 
  sigmoidally- 
  

   bent 
  neural 
  spines. 
  The 
  latter 
  are 
  shorter 
  than 
  their 
  

   supporting 
  arches, 
  shortest 
  beneath 
  the 
  anterior 
  half 
  of 
  

   the 
  dorsal 
  fin, 
  thickest 
  and 
  most 
  widely 
  spaced 
  anteriorly 
  

   immediately 
  behind 
  the 
  head. 
  The 
  ribs 
  are 
  remarkably 
  

   slender 
  and 
  short, 
  not 
  half 
  encircling 
  the 
  abdominal 
  

   cavity. 
  The 
  neural 
  and 
  haemal 
  spines 
  are 
  fused 
  with 
  

   their 
  supporting 
  arches 
  in 
  the 
  caudal 
  region, 
  much 
  inclined 
  

   backwards 
  and 
  approximately 
  symmetrical, 
  except 
  at 
  the 
  

   base 
  of 
  the 
  caudal 
  fin 
  where 
  the 
  haamals 
  are 
  much 
  en- 
  

   larged. 
  The 
  left 
  pectoral 
  fin 
  and 
  both 
  the 
  pelvic 
  fins 
  are 
  

   preserved, 
  both 
  of 
  relatively 
  small 
  size, 
  but 
  the 
  latter 
  

   especially 
  reduced. 
  The 
  pelvic 
  pair 
  arises 
  at 
  a 
  point 
  0*11 
  

   distant 
  from 
  the 
  origin 
  of 
  the 
  pectorals 
  and 
  0-145 
  from 
  

   that 
  of 
  the 
  anal. 
  Only 
  a 
  few 
  supports 
  of 
  the 
  dorsal 
  fin 
  

   are 
  shown, 
  these 
  being 
  well 
  in 
  advance 
  of 
  the 
  anal, 
  which 
  

   is 
  much 
  extended 
  but 
  not 
  sufficiently 
  well-preserved 
  for 
  

   the 
  counting 
  of 
  the 
  rays. 
  The 
  caudal 
  fin 
  is 
  complete, 
  

   exhibiting 
  the 
  very 
  fine 
  subdivision 
  of 
  the 
  rays 
  at 
  its 
  

   hiuder 
  border 
  and 
  a 
  fringe 
  of 
  small 
  fulcra 
  on 
  its 
  anterior 
  

   margins. 
  The 
  scales 
  are 
  smooth, 
  but 
  the 
  majority 
  

   probably 
  exhibit 
  only 
  their 
  inner 
  face. 
  

  

  By 
  exchange, 
  1893. 
  

  

  P. 
  7181. 
  An 
  equally 
  large 
  fish 
  similarly 
  displaying 
  the 
  axial 
  

   skeleton 
  of 
  the 
  trunk 
  and 
  the 
  very 
  fine 
  tubercular 
  orna- 
  

   ment 
  of 
  some 
  of 
  the 
  external 
  bones 
  ; 
  Eichstadt. 
  The 
  

   pelvic 
  fins 
  are 
  displaced 
  but 
  well 
  preserved, 
  and 
  the 
  remains 
  

   of 
  the 
  dorsal 
  fin 
  exhibit 
  a 
  fringe 
  of 
  small 
  fulcra 
  on 
  its 
  

  

  