﻿62 
  ACTINOPTEKYGII. 
  

  

  Lower 
  Hawkesbury-Wianamatta 
  Series 
  ; 
  Gosford, 
  New 
  

  

  South 
  Wales. 
  [Trunk, 
  wanting 
  head 
  ; 
  Geological 
  Survey 
  

  

  Museum, 
  Sydney.] 
  

   Semionotus 
  elongatus, 
  0. 
  Fraas, 
  Wiirtt. 
  Jahresh. 
  vol. 
  xvii. 
  (1861), 
  

  

  pp. 
  93, 
  95, 
  pi. 
  i. 
  figs. 
  4, 
  5. 
  — 
  Middle 
  Keuper 
  ; 
  Stuttgart. 
  

  

  [Distorted 
  fish 
  ; 
  Stuttgart 
  Museum.] 
  

   Semionotus 
  gibbus, 
  K. 
  von 
  Seebach, 
  Zeitschr. 
  deutsch. 
  geol. 
  Ges. 
  

  

  vol. 
  xviii. 
  (1866), 
  p. 
  7 
  (gibber, 
  errore) 
  ; 
  "W. 
  Deecke, 
  Palse- 
  

  

  ontogr. 
  vol. 
  xxxv. 
  (1889), 
  p. 
  105. 
  — 
  Bunter 
  Sandstone 
  ; 
  

  

  Bernburg, 
  Anhalt. 
  [Fragmentary 
  trunk 
  ; 
  University 
  

  

  Geological 
  Museum, 
  Gottingen.] 
  

   Semionotus 
  gibbus, 
  F. 
  Bassani 
  (non 
  Seebach), 
  Atti 
  Soc. 
  Ital. 
  Sci. 
  

  

  Nat. 
  vol.xxix. 
  (1886), 
  p. 
  37. 
  — 
  Triassic; 
  Besano, 
  Lombardy. 
  

  

  [Nearly 
  complete 
  fish 
  ; 
  Milan 
  Museum.] 
  

   Semionotus 
  letticus, 
  0. 
  Fraas, 
  Wiirtt. 
  Jahresh. 
  vol. 
  xvii. 
  (1861), 
  

  

  p. 
  97, 
  pi. 
  i. 
  fig. 
  8. 
  — 
  Upper 
  Triassic 
  (Lettenkohl) 
  ; 
  Hoheneck, 
  

  

  Wiirtemberg. 
  [Imperfect 
  fish 
  ; 
  Stuttgart 
  Museum.] 
  

   Semionotus 
  nilssoni, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  (1837), 
  

  

  p. 
  229, 
  pi. 
  xxvii 
  a. 
  figs. 
  1-5 
  ; 
  B. 
  Lundgren, 
  Kongl. 
  Fysiogr. 
  

  

  Sallsk. 
  Minneskr. 
  1878, 
  no. 
  v. 
  p. 
  32, 
  pi. 
  ii. 
  fig. 
  79.— 
  Bhsetic; 
  

  

  Hoeganaes, 
  Sweden. 
  [Head 
  and 
  anterior 
  portion 
  of 
  trunk 
  ; 
  

  

  Museum 
  of 
  Comparative 
  Zoology, 
  Cambridge, 
  Mass., 
  U.S.A.] 
  

   Semionotus 
  serratus, 
  0. 
  Fraas, 
  Wiirtt. 
  Jahresh. 
  vol. 
  xvii. 
  (1861), 
  

  

  p. 
  97, 
  pi. 
  i. 
  fig. 
  7. 
  — 
  Middle 
  Keuper 
  ; 
  Hiitten, 
  Wiirtem- 
  

   berg. 
  [Anterior 
  portion 
  of 
  fish 
  ; 
  Stuttgart 
  Museum.] 
  

  

  (? 
  Coloboclus.) 
  

  

  Fragments 
  of 
  Semionotus 
  have 
  also 
  been 
  described 
  from 
  the 
  Upper 
  

   Keuper 
  of 
  Colwick 
  Wood, 
  Nottingham 
  (E. 
  T. 
  Newton, 
  Quart. 
  Journ. 
  

   Geol. 
  Soc. 
  vol. 
  xliii. 
  1887, 
  p. 
  539, 
  pi. 
  xxii. 
  fig. 
  8), 
  and 
  from 
  the 
  

   Bunter 
  Sandstone 
  of 
  Inzlingen, 
  near 
  Basle, 
  Switzerland 
  (W. 
  Deecke, 
  

   Palaeontogr. 
  vol. 
  xxxv. 
  1889, 
  p. 
  104, 
  pi. 
  vi. 
  fig. 
  7 
  : 
  Basle 
  Museum) 
  ; 
  

   and 
  the 
  present 
  writer 
  has 
  examined 
  characteristic 
  specimens 
  from 
  

   the 
  Rhgetic 
  probably 
  of 
  Bur 
  Crowcombe 
  (Bath 
  Museum) 
  and 
  Haps- 
  

   ford 
  Mill, 
  Vallis, 
  Somersetshire. 
  

  

  Nearly 
  complete 
  fishes, 
  variously 
  crushed 
  and 
  distorted 
  and 
  some- 
  

   times 
  imperfectly 
  preserved, 
  have 
  been 
  described 
  from 
  the 
  Trias 
  of 
  

   North 
  America 
  under 
  the 
  following 
  names. 
  They 
  may 
  be 
  con- 
  

   veniently 
  referred 
  to 
  the 
  genus 
  Semionotus, 
  and 
  doubtless 
  represent 
  

   much 
  fewer 
  species 
  than 
  are 
  here 
  enumerated 
  : 
  — 
  

  

  Ischypterus 
  agassizi, 
  Sir 
  P. 
  Egerton, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

   vol. 
  vi. 
  (1850), 
  p. 
  10 
  ; 
  J. 
  S. 
  Newberry, 
  Foss. 
  Fishes 
  Trias. 
  

  

  