﻿420 
  ACTTNOPTERYGII. 
  

  

  teeth 
  at 
  the 
  dentary 
  symphysis, 
  and 
  a 
  single 
  tooth 
  at 
  the 
  proximal 
  

   end 
  of 
  the 
  presymphysial 
  bone 
  large, 
  the 
  principal 
  mandibular 
  teeth 
  

   of 
  the 
  dentary 
  bone 
  numerous, 
  well-spaced, 
  regularly 
  arranged, 
  and 
  

   of 
  moderate 
  size. 
  Pelvic 
  fins 
  arising 
  midway 
  between 
  the 
  pectorals 
  

   and 
  the 
  caudal 
  ; 
  anal 
  with 
  about 
  20 
  rays, 
  slightly 
  nearer 
  to 
  the 
  

   pelvic 
  fins 
  than 
  to 
  the 
  caudal, 
  and 
  dorsal 
  fin, 
  with 
  about 
  12 
  rays, 
  

   directly 
  opposed 
  to 
  its 
  anterior 
  portion. 
  Scales 
  almost 
  smooth 
  in 
  

   young 
  individuals, 
  coarsely 
  though 
  sparsely 
  tuberculated 
  and 
  partly 
  

   rugose 
  in 
  adults. 
  

  

  The 
  synonymy 
  and 
  characters 
  of 
  this 
  species 
  given 
  above 
  are 
  

   chiefly 
  based 
  on 
  the 
  researches 
  of 
  Wagner 
  and 
  Vetter. 
  The 
  last- 
  

   named 
  author 
  also 
  points 
  out 
  that 
  the 
  rostrum 
  of 
  the 
  fish 
  attains 
  its 
  

   full 
  development 
  at 
  an 
  early 
  stage, 
  subsequently 
  only 
  increasing 
  in 
  

   thickness 
  ; 
  it 
  thus 
  appears 
  relatively 
  longer 
  in 
  the 
  young 
  than 
  in 
  

   the 
  adult. 
  One 
  fine 
  specimen 
  from 
  Eichstadt 
  in 
  the 
  Palseontolo- 
  

   gical 
  Museum, 
  Munich, 
  only 
  differs 
  from 
  the 
  typical 
  A. 
  acutirostris 
  

   in 
  its 
  somewhat 
  blunter 
  snout 
  and 
  is 
  described 
  under 
  the 
  specific 
  

   name 
  of 
  A. 
  obtusirostris 
  by 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

   math.-phys. 
  CI. 
  vol. 
  ix. 
  (1863), 
  p. 
  687. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  

   Bavaria. 
  

  

  P. 
  7574. 
  Scattered 
  remains 
  of 
  a 
  large 
  fish 
  about 
  one 
  metre 
  in 
  length, 
  

   in 
  counterpart 
  ; 
  Solenhofen. 
  Some 
  of 
  the 
  head-bones, 
  

   ring-vertebrse, 
  and 
  highly 
  ornamented 
  scales 
  are 
  well 
  

   shown 
  ; 
  and 
  the 
  paired 
  fins 
  are 
  preserved. 
  

  

  37777. 
  Similar 
  fish 
  with 
  squamation 
  less 
  displaced, 
  in 
  counterpart 
  ; 
  

   Solenhofen. 
  Presented 
  by 
  W. 
  C. 
  Neville, 
  Esq., 
  1863. 
  

  

  P. 
  3808. 
  An 
  equally 
  large 
  fish, 
  wanting 
  the 
  snout 
  but 
  with 
  well- 
  

   preserved 
  caudal 
  fin 
  and 
  remains 
  of 
  the 
  dorsal, 
  anal, 
  and 
  

   paired 
  fins 
  ; 
  Solenhofen. 
  As 
  in 
  the 
  two 
  previous 
  speci- 
  

   mens, 
  the 
  vertebral 
  axis 
  of 
  the 
  caudal 
  region 
  is 
  curiously 
  

   displaced 
  and 
  thrown 
  upwards 
  beyond 
  the 
  limits 
  of 
  the 
  

   continuous 
  squamation. 
  EnnisMllen 
  Coll. 
  

  

  37791. 
  Somewhat 
  smaller 
  specimen 
  in 
  a 
  similar 
  state 
  of 
  preserva- 
  

   tion, 
  but 
  having 
  the 
  vertebral 
  axis 
  disjointed 
  and 
  wanting 
  

   the 
  greater 
  part 
  of 
  the 
  head 
  ; 
  Solenhofen. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  972, 
  P. 
  3807. 
  Imperfect 
  contorted 
  fish 
  at 
  least 
  0-85 
  in 
  length, 
  

   showing 
  some 
  of 
  the 
  finely 
  ornamented 
  squamation, 
  in 
  

   counterpart 
  : 
  Solenhofen. 
  Egerton 
  Sf 
  EnnisMllen 
  Colls. 
  

  

  