﻿ASPIDORHYNCHID.E. 
  419 
  

  

  Aspidorhynchus 
  acutirostris 
  (Blainville). 
  

  

  1755. 
  Figures 
  by 
  G. 
  W. 
  Knorr, 
  Samml. 
  Merkwiirdigk. 
  Natur, 
  pt. 
  i. 
  

  

  p. 
  38, 
  pis. 
  xxiii., 
  xxix. 
  fig. 
  1. 
  

   1818. 
  JEsox 
  acutirostris, 
  H. 
  D. 
  de 
  Blainville, 
  Nouv. 
  Diet. 
  d'Hist. 
  Nat. 
  

  

  vol. 
  xxvii. 
  p. 
  332. 
  

   1823. 
  Esox 
  acutirostris, 
  J. 
  F. 
  Kriiger, 
  Geschichte 
  der 
  Urwelt, 
  vol, 
  ii. 
  

  

  p. 
  665. 
  

   1833. 
  Aspidorhynchus 
  acutirostris, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  478, 
  

  

  and 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  14. 
  

   1842. 
  Aspidorhynchus 
  longissimus, 
  G. 
  von 
  Miinster, 
  Neues 
  Jahrb. 
  p. 
  44. 
  

  

  [Nearly 
  complete 
  fish 
  ; 
  Palseontologieal 
  Museum, 
  Munich.] 
  

   1844. 
  Aspidorhynchus 
  acutirostris, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  

  

  pt. 
  ii. 
  p. 
  136, 
  pi. 
  xlvi. 
  

   1844. 
  Aspidorhynchus 
  speciosus, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  137, 
  pi. 
  xlv. 
  

  

  [Imperfect 
  trunk; 
  Paleeontological 
  Museum, 
  Munich.] 
  

   1842-44. 
  Aspidorhynchus 
  ornatissimus, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  138, 
  pi. 
  xlvii. 
  

  

  [Portion 
  of 
  fish 
  ; 
  Palseontological 
  Museum, 
  Munich, 
  and 
  Wood- 
  

  

  wardian 
  Museum, 
  Cambridge.] 
  

   1844. 
  Aspidorhynchtis 
  mandibularis, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  138. 
  

   1861. 
  Belonostomus 
  microcephalus, 
  T. 
  C. 
  Winkler, 
  Descript. 
  Poiss. 
  

  

  Foss. 
  Solenhofen 
  (Natuurk. 
  Verhandl. 
  Holland. 
  Maatsch. 
  [2] 
  

  

  vol. 
  xiv.), 
  p. 
  26, 
  fig. 
  4. 
  

   1863. 
  Aspidorhynchus 
  acutirostris, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  

  

  "Wiss., 
  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  680. 
  

   1863. 
  Aspidorhynchus 
  mandibularis, 
  A. 
  Wagner, 
  ibid. 
  p. 
  684. 
  

   1871. 
  Aspidorhynchus 
  ornatissimus, 
  T. 
  C. 
  Winkler, 
  Archiv. 
  Mus. 
  Teyler, 
  

  

  vol. 
  iii. 
  p. 
  183, 
  pi. 
  v. 
  figs. 
  11, 
  12. 
  

   1881. 
  Aspidorhynchus 
  acutirostris, 
  B. 
  Vetter, 
  Mittheil. 
  k. 
  mineral.-geol. 
  

  

  Mus. 
  Dresden, 
  pt. 
  iv. 
  p. 
  83. 
  

   1887. 
  Aspidorhynchus 
  acutirostris, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palaeont. 
  

  

  vol. 
  iii. 
  p. 
  220, 
  figs. 
  233, 
  234. 
  

   1887. 
  Aspidorhynchus, 
  0. 
  Reis, 
  Sitzungsb. 
  k. 
  bay. 
  Akad. 
  W 
  r 
  iss., 
  math.- 
  

   phys. 
  CI. 
  vol. 
  xvii. 
  p. 
  151, 
  pi. 
  i. 
  figs. 
  1-3, 
  6, 
  7, 
  pi. 
  ii. 
  figs. 
  1-4, 
  7. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Paris 
  Museum 
  of 
  Natural 
  History. 
  

  

  The 
  type 
  species, 
  of 
  large 
  size, 
  attaining 
  a 
  length 
  of 
  1 
  metre. 
  

   Head 
  with 
  opercular 
  apparatus 
  occupying 
  somewhat 
  less 
  than 
  one- 
  

   quarter 
  of 
  the 
  total 
  length 
  ; 
  maximum 
  depth 
  of 
  trunk 
  contained 
  

   between 
  nine 
  and 
  ten 
  times 
  in 
  the 
  total 
  length. 
  Cranium 
  rapidly 
  

   tapering 
  to 
  the 
  acute 
  rostrum, 
  which 
  projects 
  in 
  advance 
  of 
  the 
  

   mandible 
  to 
  an 
  extent 
  at 
  least 
  equal 
  to 
  one-third 
  of 
  the 
  total 
  length 
  

   of 
  the 
  cranium 
  ; 
  cranial 
  bones 
  and 
  operculum 
  ornamented 
  with 
  

   granulations 
  and 
  short 
  longitudinal 
  rugae, 
  the 
  latter 
  especially 
  con- 
  

   spicuous 
  on 
  the 
  rostrum 
  ; 
  preoperculum 
  with 
  radiating 
  ridges 
  at 
  

   the 
  angle 
  ; 
  mandible 
  and 
  branchiostegal 
  apparatus 
  almost 
  smooth 
  ; 
  

   presymphysial 
  bone 
  rapidly 
  tapering, 
  twice 
  as 
  long 
  as 
  its 
  maximum 
  

   depth 
  ; 
  upper 
  laniary 
  teeth 
  at 
  the 
  base 
  of 
  the 
  rostrum, 
  one 
  or 
  two 
  

  

  2 
  e 
  2 
  

  

  