﻿488 
  ACTINOPTEiiYGII. 
  

  

  Genus 
  ARCHiEOIYLflENE, 
  A. 
  S. 
  Woodward. 
  

  

  [Described 
  in 
  forthcoming 
  Mem. 
  Geol. 
  Surv. 
  N. 
  S. 
  Wales, 
  

   Palasont. 
  no. 
  9.] 
  

  

  Trunk 
  elegantly 
  fusiform 
  and 
  laterally 
  compressed, 
  with 
  con- 
  

   spicuous 
  upper 
  caudal 
  lobe. 
  Head 
  small 
  and 
  snout 
  obtuse 
  ; 
  one 
  

   large 
  suborbital 
  occupying 
  the 
  greater 
  part 
  of 
  the 
  cheek 
  behind 
  the 
  

   orbit 
  ; 
  oral 
  border 
  of 
  maxilla 
  convex 
  ; 
  teeth 
  all 
  small, 
  those 
  of 
  the 
  

   margin 
  of 
  the 
  jaws 
  arranged 
  in 
  close 
  regular 
  series. 
  Notochord 
  

   persistent 
  ; 
  hypocentra 
  and 
  pleurocentra 
  rudimentary 
  or 
  absent 
  ; 
  

   ribs 
  long 
  and 
  slender. 
  Fulcra 
  small 
  on 
  all 
  the 
  fins. 
  Pelvic 
  fins 
  

   nearly 
  as 
  large 
  as 
  the 
  pectorals 
  ; 
  dorsal 
  and 
  anal 
  fins 
  acuminate 
  and 
  

   opposed, 
  the 
  former 
  short-based, 
  the 
  latter 
  more 
  extended 
  ; 
  caudal 
  

   fin 
  forked. 
  Scales 
  thin, 
  deeply 
  imbricating, 
  and 
  almost 
  cycloidal, 
  

   those 
  of 
  the 
  flank 
  not 
  deepened, 
  and 
  those 
  of 
  the 
  dorsal 
  and 
  ventral 
  

   aspect 
  about 
  as 
  deep 
  as 
  broad 
  ; 
  conspicuous 
  obtuse 
  ridge-scales 
  

   dorsally 
  and 
  ventrally. 
  

  

  Archseomsene 
  tenuis, 
  A. 
  S. 
  Woodward. 
  

  

  [Described 
  in 
  forthcoming 
  Mem. 
  Geol. 
  Surv. 
  N. 
  S. 
  Wales, 
  Palseont. 
  

   no. 
  9, 
  with 
  drawings 
  on 
  pi. 
  ii. 
  figs. 
  5, 
  6.] 
  

  

  Type. 
  Fish 
  ; 
  Museum 
  of 
  Geol. 
  Surv. 
  N". 
  S. 
  Wales, 
  Sydney. 
  

  

  The 
  type 
  species, 
  commonly 
  attaining 
  a 
  length 
  of 
  about 
  0*12. 
  

   Head 
  with 
  opercular 
  apparatus 
  occupying 
  somewhat 
  less 
  than 
  one- 
  

   fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish 
  ; 
  maximum 
  depth 
  of 
  trunk 
  equalling 
  

   about 
  one-third 
  of 
  the 
  length 
  from 
  the 
  pectoral 
  arch 
  to 
  the 
  base 
  of 
  

   the 
  caudal 
  fin. 
  Pectoral 
  fin 
  with 
  from 
  10 
  to 
  12 
  rays, 
  the 
  foremost 
  

   especially 
  stout 
  ; 
  pelvic 
  fins 
  arising 
  midway 
  between 
  the 
  pectorals 
  

   and 
  the 
  anal, 
  each 
  with 
  about 
  6 
  rays 
  ; 
  dorsal 
  fin 
  comprising 
  about 
  

   10 
  rays, 
  arising 
  behind 
  the 
  middle 
  point 
  of 
  the 
  back 
  directly 
  

   opposite 
  to 
  the 
  origin 
  of 
  the 
  anal, 
  which 
  has 
  not 
  less 
  than 
  14 
  rays. 
  

   Scales 
  exhibiting 
  only 
  the 
  concentric 
  lines 
  of 
  growth. 
  

  

  Form. 
  SfLoc. 
  Upper 
  Hawkesbury-Wianamatta 
  Series 
  : 
  Talbragar, 
  

   N. 
  S. 
  Wales. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Archaeomsene 
  robustus, 
  A. 
  S. 
  Woodward. 
  

  

  [Described 
  in 
  forthcoming 
  Mem. 
  Geol. 
  Surv. 
  N". 
  S. 
  Wales, 
  Palseont. 
  

   no. 
  9, 
  with 
  drawings 
  on 
  pi. 
  v. 
  figs. 
  2-4.] 
  

  

  Type. 
  Head 
  with 
  part 
  of 
  abdominal 
  region 
  ; 
  Museum 
  of 
  Geol. 
  

   Surv. 
  N. 
  S. 
  Wales, 
  Sydney. 
  

  

  A 
  species 
  commonly 
  attaining 
  a 
  length 
  of 
  about 
  0*2. 
  Head 
  with 
  

   opercular 
  apparatus 
  occupying 
  about 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  

  

  