﻿SEMIONOTID^. 
  77 
  

  

  It 
  is 
  not 
  improbable 
  that 
  the 
  following 
  species 
  is 
  also 
  correctly 
  

   placed 
  here 
  : 
  — 
  

  

  Lepidotus 
  triasicus, 
  F. 
  Bassani, 
  Atti 
  Soc. 
  Ital. 
  Sci. 
  Nat. 
  vol. 
  xxix. 
  

   (1886), 
  p. 
  38. 
  — 
  Keuper 
  ; 
  Besano, 
  Lombardy. 
  [Hinder 
  

   portion 
  of 
  trunk 
  ; 
  Milan 
  Museum.] 
  

  

  To 
  this 
  genus 
  may 
  also 
  perhaps 
  be 
  referred 
  the 
  detached 
  teeth 
  

   from 
  the 
  Keuper 
  of 
  Tiibingen, 
  "Wurtemberg, 
  bearing 
  the 
  undefined 
  

   name 
  of 
  Pycnodus 
  priscus 
  (L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  

   1844, 
  p. 
  199), 
  and 
  others 
  described 
  as 
  Sp7icerodus 
  annularis 
  (L. 
  

   Agassiz, 
  ibid. 
  p. 
  211, 
  pi. 
  lxxiii. 
  figs. 
  95-100). 
  The 
  origin 
  of 
  the 
  

   latter 
  is 
  uncertain. 
  

  

  The 
  indefinable 
  genus 
  Cenclirodus 
  (H. 
  von 
  Meyer, 
  Neues 
  Jahrb. 
  

   1847, 
  p. 
  574), 
  founded 
  upon 
  a 
  dentigerous 
  bone, 
  may 
  perhaps 
  be 
  

   related 
  to 
  Colobodus, 
  but 
  its 
  affinities 
  are 
  uncertain. 
  Two 
  species 
  

   are 
  recognized 
  from 
  the 
  Muschelkalk 
  of 
  Upper 
  Silesia, 
  namely, 
  Oen- 
  

   chrodus 
  aoepperti 
  and 
  C. 
  ottoi 
  (H. 
  von 
  Meyer, 
  loc. 
  cit. 
  p. 
  574, 
  and 
  

   Pakeontogr. 
  vol. 
  i. 
  1851, 
  pp. 
  243-247, 
  pi. 
  xxviii. 
  figs. 
  18, 
  19). 
  

  

  Genus 
  LEPIDOTUS, 
  Agassiz. 
  

  

  [Neues 
  Jahrb. 
  1832, 
  p. 
  145 
  (Lepidotes), 
  and 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  

   pt. 
  i. 
  1833, 
  pp. 
  8,233.] 
  

  

  Syn. 
  Lepidosaurus, 
  H. 
  von 
  Meyer, 
  Palseologica, 
  1832, 
  p. 
  208. 
  

  

  Sphcsrodus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  1833, 
  p. 
  15 
  (in 
  

  

  part). 
  

   Scrobodus, 
  G. 
  von 
  Miinster, 
  Nenes 
  Jahrb. 
  1842, 
  p. 
  38. 
  

   Plesiodus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  

  

  vol. 
  ix. 
  1863, 
  p. 
  632. 
  

   Prolepidotus, 
  K. 
  Michael, 
  Zeitschr. 
  deutsch. 
  geol. 
  Ges. 
  vol. 
  xlv. 
  

  

  1893, 
  p. 
  729. 
  

  

  Trunk 
  fusiform 
  and 
  only 
  moderately 
  compressed. 
  Marginal 
  

   teeth 
  robust, 
  styliform; 
  inner 
  teeth 
  stouter, 
  often 
  tritoral 
  but 
  

   smooth 
  ; 
  opercular 
  apparatus 
  well 
  developed, 
  with 
  a 
  narrow 
  arched 
  

   preoperculum, 
  but 
  with 
  few 
  branchiostegal 
  rays, 
  and 
  the 
  gular 
  plate 
  

   wanting. 
  Ribs 
  ossified. 
  Fin-fulcra 
  very 
  large, 
  present 
  on 
  all 
  the 
  

   fins, 
  biserial. 
  Paired 
  fins 
  small 
  ; 
  dorsal 
  and 
  anal 
  fins 
  short 
  and 
  

   deep, 
  the 
  former 
  opposed 
  to 
  the 
  space 
  between 
  the 
  latter 
  and 
  the 
  

   pelvic 
  fins 
  ; 
  caudal 
  fin 
  slightly 
  forked. 
  Scales 
  very 
  robust, 
  smooth 
  

   or 
  feebly 
  ornamented 
  ; 
  flank-scales 
  not 
  much 
  deeper 
  than 
  broad, 
  

   with 
  their 
  wide 
  overlapped 
  margin 
  produced 
  forwards 
  at 
  the 
  

   superior 
  and 
  inferior 
  angles; 
  scales 
  of 
  the 
  ventral 
  aspect 
  nearly 
  

   as 
  deep 
  as 
  broad; 
  dorsal 
  and 
  ventral 
  ridge-scales 
  usually 
  incon- 
  

   spicuous. 
  

  

  