﻿BEL0X0RHYXCHIDJ3. 
  11 
  

  

  of 
  any 
  other 
  ossification 
  either 
  in 
  the 
  opercular 
  or 
  branchiostegal 
  

   membrane. 
  

  

  The 
  notochord 
  is 
  persistent, 
  and 
  there 
  are 
  no 
  undoubted 
  ossifi- 
  

   cations 
  in 
  the 
  notochordal 
  sheath. 
  The 
  neural 
  and 
  haemal 
  arches, 
  

   however, 
  are 
  much 
  expanded, 
  the 
  former 
  united 
  by 
  zygapophyses 
  

   and 
  bearing 
  short 
  delicate 
  spines, 
  the 
  latter 
  in 
  the 
  caudal 
  region 
  

   symmetrical 
  with 
  the 
  neurals. 
  Long 
  slender 
  ribs 
  are 
  also 
  observed 
  

   in 
  the 
  Australian 
  specimens. 
  

  

  The 
  paired 
  fins 
  are 
  small, 
  apparently 
  exhibiting 
  a 
  very 
  feeble 
  

   lobation, 
  and 
  consisting 
  of 
  delicate 
  rays. 
  The 
  clavicle 
  is 
  also 
  

   relatively 
  small 
  and 
  sickle-shaped, 
  with 
  a 
  triangular 
  plate 
  affixed 
  to 
  

   its 
  postero-inferior 
  border 
  ; 
  the 
  pelvic 
  fin-supports 
  are 
  unknown. 
  

   The 
  dorsal 
  and 
  anal 
  fins 
  exhibit 
  a 
  series 
  of 
  robust 
  supports 
  much 
  

   less 
  numerous 
  than 
  the 
  dermal 
  rays 
  ; 
  and 
  neither 
  on 
  these 
  nor 
  on 
  

   any 
  other 
  fins 
  are 
  there 
  indications 
  of 
  fulcra. 
  

  

  The 
  longitudinal 
  series 
  of 
  dermal 
  scutes, 
  forming 
  dorsal 
  and 
  

   ventral 
  ridges 
  and 
  a 
  support 
  for 
  the 
  lateral 
  line, 
  are 
  more 
  or 
  less 
  

   A-shaped 
  and 
  deeply 
  imbricating, 
  sometimes 
  broad 
  and 
  tuberculated, 
  

   sometimes 
  narrow 
  and 
  smooth. 
  The 
  ventral 
  series 
  divides 
  to 
  form 
  

   a 
  ring 
  round 
  the 
  anus. 
  The 
  present 
  writer 
  has 
  not 
  observed 
  any 
  

   distinct 
  evidence 
  of 
  intermediate 
  scales 
  or 
  calcifications. 
  

  

  The 
  species 
  of 
  Belonorhynchus 
  are 
  distinguished 
  chiefly 
  by 
  differ- 
  

   ences 
  in 
  the 
  relative 
  proportions 
  of 
  the 
  head 
  and 
  trunk, 
  in 
  the 
  form, 
  

   proportions, 
  and 
  ornamentation 
  of 
  the 
  head 
  and 
  scutes. 
  

  

  Belonorhynchus 
  striolatus, 
  Bronn. 
  

  

  1858. 
  Belonorhynchus 
  striolatus, 
  H. 
  G. 
  Bronn, 
  Neues 
  Jahrb. 
  p. 
  12, 
  

  

  pi. 
  i. 
  figs. 
  1-10, 
  pi. 
  ii. 
  fig. 
  1. 
  

   1866. 
  Belonorhynchus 
  striolatus, 
  H. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss, 
  

  

  Wien, 
  math.-naturw. 
  CI. 
  vol. 
  liii. 
  pt. 
  i. 
  p. 
  189, 
  pi. 
  vi. 
  

   1892. 
  Saurichthys 
  striolatus, 
  0. 
  M. 
  Beis, 
  Geogn. 
  Jakresh. 
  1891, 
  p. 
  148, 
  

  

  fig. 
  5. 
  

  

  Type. 
  Nearly 
  complete 
  fishes. 
  

  

  The 
  type 
  species, 
  of 
  small 
  size, 
  attaining 
  a 
  maximum 
  length 
  of 
  

   about 
  0-15. 
  Snout 
  extremely 
  attenuated, 
  the 
  head 
  and 
  opercular 
  

   apparatus 
  occupying 
  about 
  two- 
  fifths 
  of 
  the 
  total 
  length; 
  facial 
  

   bones 
  marked 
  with 
  prominent 
  vertical 
  striations 
  ; 
  operculum 
  about 
  

   as 
  deep 
  as 
  broad. 
  Space 
  between 
  the 
  pectoral 
  and 
  pelvic 
  fins 
  more 
  

   than 
  twice 
  as 
  great 
  as 
  that 
  between 
  the 
  latter 
  and 
  the 
  anal. 
  

   Scutes 
  of 
  dorsal 
  and 
  ventral 
  series 
  narrow 
  and 
  slender, 
  much 
  

   elongated 
  on 
  the 
  caudal 
  pedicle 
  ; 
  scutes 
  of 
  lateral 
  line 
  relatively 
  

   small. 
  

  

  Form. 
  4' 
  Loc. 
  Upper 
  Keuper 
  : 
  Kaibl, 
  Carinthia. 
  

  

  