﻿BELONORRTNCHID^). 
  V 
  

  

  of 
  the 
  trunk 
  and 
  contained 
  five 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  

   fish. 
  External 
  head-bones 
  ornamented 
  with 
  rugae 
  and 
  striae, 
  the 
  

   mandible 
  being 
  longitudinally 
  striated. 
  Pelvic 
  fins 
  arising 
  midway 
  

   between 
  the 
  pectoral 
  arch 
  and 
  the 
  anal 
  fin 
  ; 
  dorsal 
  fin 
  at 
  least 
  as 
  

   deep 
  as 
  long, 
  arising 
  considerably 
  in 
  advance 
  of 
  the 
  anal 
  fin, 
  and 
  

   smaller 
  than 
  the 
  latter, 
  which 
  is 
  elongated 
  and 
  comprises 
  not 
  less 
  

   than 
  40 
  rays. 
  Scales 
  smooth, 
  their 
  hinder 
  border 
  conspicuously 
  

   pectinated, 
  except 
  on 
  the 
  caudal 
  region. 
  

  

  . 
  Form. 
  Sf 
  Log. 
  Upper 
  Karoo 
  Formation 
  (Stormberg 
  Beds) 
  : 
  Roux- 
  

   ville, 
  Orange 
  Free 
  State, 
  South 
  Africa. 
  

   Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Family 
  BELONORHYNCHIDiE. 
  

  

  Trunk 
  elongated 
  and 
  slender 
  ; 
  tail 
  abbreviate-diphycercal. 
  Head- 
  

   bones 
  well-developed, 
  delicately 
  ornamented 
  withganoine, 
  andthcsa 
  

   of 
  the 
  cranial 
  roof 
  forming 
  a 
  continuous 
  shield, 
  without 
  a 
  median 
  

   longitudinal 
  series 
  of 
  azygous 
  elements 
  ; 
  snout 
  much 
  elongated 
  and 
  

   slender 
  ; 
  dentition 
  consisting 
  of 
  well-spaced 
  large 
  conical 
  teeth, 
  with 
  

   numerous 
  intervening 
  minute 
  teeth 
  ; 
  opercular 
  apparatus 
  reduced, 
  

   without 
  branchiostegal 
  rays. 
  Dorsal 
  and 
  anal 
  fins 
  single, 
  remote 
  ; 
  

   fulcra 
  minute 
  or 
  absent. 
  Trunk 
  wanting 
  a 
  continuous 
  squamation, 
  

   but 
  exhibiting 
  isolated 
  longitudinal 
  series 
  of 
  scutes. 
  

  

  Only 
  one 
  definable 
  genus 
  of 
  this 
  family, 
  Belonorhynclius, 
  has 
  

   hitherto 
  been 
  discovered 
  ; 
  the 
  fragments 
  ascribed 
  to 
  Sauriehthys 
  and 
  

   Broivneichihys 
  being 
  too 
  imperfect 
  for 
  satisfactory 
  discussion. 
  

  

  Genus 
  BELONORHYNCHUS, 
  Bronn. 
  

   [Neues 
  Jahrb. 
  1858, 
  p. 
  12.] 
  

  

  Syn. 
  Saurorhynchus, 
  G. 
  von 
  Minister 
  {teste 
  Bronn, 
  Nomencl.), 
  in 
  F. 
  

  

  Braun, 
  Verzeichn. 
  Bayreuth 
  befindl. 
  Petrefact. 
  1840, 
  p. 
  73 
  

  

  (name 
  only). 
  

   Ichthyorhynchus, 
  C. 
  Bellotti, 
  in 
  A. 
  Stoppani, 
  Stuclii 
  Geol. 
  e 
  

  

  Paleont. 
  Lombardia, 
  1857, 
  p. 
  436. 
  

   Gifonus, 
  0. 
  G. 
  Costa, 
  Atti 
  R. 
  Accad. 
  Sci. 
  Napoli, 
  vol. 
  vi., 
  

  

  Append. 
  1862, 
  p. 
  26. 
  

   Stylo?'hynchus, 
  K. 
  Martin, 
  Zeitschr. 
  deutsch. 
  geol. 
  Ges. 
  vol. 
  xxv. 
  

  

  1873, 
  p. 
  725. 
  

   Saurorhynchus, 
  0. 
  M. 
  Reis, 
  Geogn. 
  Jahresh. 
  1891 
  (1892), 
  

  

  p. 
  145. 
  

  

  Upper 
  and 
  lower 
  jaws 
  approximately 
  equal 
  in 
  length, 
  provided 
  

   with 
  few 
  large 
  conical 
  teeth, 
  and 
  a 
  close 
  series 
  of 
  similar 
  but 
  smaller 
  

  

  