﻿SEMIONOTID^;. 
  i 
  O 
  

  

  1850. 
  Lepidotus 
  acutirostris, 
  O. 
  G. 
  Costa, 
  Atti 
  Accad. 
  Pontau. 
  vol. 
  v. 
  

  

  p. 
  301, 
  pi. 
  viii. 
  fig. 
  1 
  a. 
  

   1850. 
  Lepidotus 
  gig 
  as, 
  0. 
  G. 
  Costa 
  (errore), 
  ibid. 
  p. 
  308, 
  pi. 
  viii. 
  fig. 
  3. 
  

   1857. 
  Lepidotus 
  ? 
  spinifer, 
  C. 
  Bellotti, 
  in 
  A. 
  Stoppani, 
  Studii 
  Geol. 
  e 
  

  

  Paleont. 
  Lonibardia, 
  p. 
  421. 
  [Fragment 
  ; 
  Milan 
  Museum.] 
  

   1862. 
  Lepidotus 
  acutirostris, 
  0. 
  G. 
  Costa, 
  Atti 
  R. 
  Accad. 
  Sci. 
  Napoli, 
  

  

  vol. 
  vi. 
  Append, 
  pp. 
  17, 
  44, 
  pi. 
  vii. 
  fig. 
  3. 
  

   1862. 
  Lepidotus 
  sp., 
  O. 
  G. 
  Costa, 
  ibid. 
  pp. 
  20, 
  42, 
  pi. 
  ii. 
  

   1862. 
  Semionotus 
  sp., 
  0. 
  G. 
  Costa, 
  ibid. 
  p. 
  43, 
  pi. 
  iii. 
  

   1862. 
  Semionotus 
  curtulus, 
  0. 
  G. 
  Costa, 
  ibid. 
  pp. 
  20, 
  43, 
  pi. 
  iv. 
  

   1862. 
  Urocomus 
  picenus, 
  0. 
  G. 
  Costa 
  {errore), 
  ibid. 
  pp. 
  27, 
  43, 
  pi. 
  vi. 
  

  

  fig. 
  1 
  a 
  a. 
  

   1866. 
  Lepidotus 
  ornatus, 
  R. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  math.- 
  

  

  naturw. 
  CI. 
  vol. 
  liv. 
  pt. 
  i. 
  p. 
  313, 
  pi. 
  ii. 
  

   1866. 
  Lepidotus 
  obesus, 
  O. 
  G. 
  Costa, 
  Atti 
  R. 
  Accad. 
  Sci. 
  Napoli, 
  vol. 
  iii. 
  

  

  no. 
  12, 
  p. 
  4, 
  pis. 
  i., 
  ii. 
  

   1889. 
  Se7nionotus 
  spinifer, 
  W. 
  Deecke, 
  Paleeontogr. 
  vol. 
  xxxv. 
  p. 
  136. 
  

  

  1891. 
  Lepidotus 
  triumplinorum, 
  A. 
  de 
  Zigno, 
  Mem. 
  R. 
  Accad. 
  Lincei, 
  

   [4] 
  vol. 
  vii. 
  p. 
  6, 
  pi. 
  i. 
  [Nearly 
  complete 
  fish 
  ; 
  University 
  of 
  

   Padua.] 
  

  

  1892. 
  Lepidotus 
  (Colobodus 
  ?) 
  ornatus, 
  F. 
  Bassani, 
  Mem. 
  Soc. 
  Ttal. 
  Sci. 
  

   [3] 
  vol. 
  ix. 
  no. 
  3, 
  p. 
  24. 
  

  

  Type. 
  Portions 
  of 
  fishes 
  ; 
  Stuttgart 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*5. 
  Trunk 
  deeply 
  fusiform, 
  

   its 
  maximum 
  depth 
  much 
  greater 
  than 
  the 
  length 
  of 
  the 
  head 
  with 
  

   opercular 
  apparatus, 
  which 
  occupies 
  nearly 
  one-quarter 
  of 
  the 
  total 
  

   length 
  of 
  the 
  fish. 
  External 
  bones 
  finely 
  ornamented 
  with 
  tubercu- 
  

   lations 
  ; 
  teeth 
  smooth, 
  not 
  closely 
  adpressed, 
  those 
  within 
  the 
  mouth 
  

   oval 
  or 
  rounded. 
  Pelvic 
  fins 
  arising 
  opposite 
  the 
  origin 
  of 
  the 
  dorsal 
  

   fin, 
  and 
  much 
  nearer 
  to 
  the 
  anal 
  than 
  to 
  the 
  pectorals 
  : 
  dorsal 
  fin 
  

   with 
  about 
  24 
  rays, 
  the 
  anal 
  less 
  than 
  half 
  as 
  large 
  and 
  opposed 
  to 
  

   its 
  hinder 
  portion. 
  Scales 
  smooth, 
  but 
  those 
  of 
  the 
  flanks, 
  except 
  in 
  

   the 
  hinder 
  half 
  of 
  the 
  caudal 
  region, 
  with 
  long 
  and 
  conspicuous 
  

   posterior 
  digitations 
  ; 
  principal 
  flank-scales 
  scarcely 
  deeper 
  than 
  

   broad. 
  

  

  Form, 
  ty 
  Log. 
  Upper 
  Triassic 
  : 
  Tyrol 
  ; 
  Italy. 
  

  

  13444. 
  Imperfect 
  hinder 
  portion 
  of 
  head 
  with 
  anterior 
  portion 
  of 
  

   trunk 
  ; 
  Seefeld, 
  Tyrol. 
  The 
  head 
  and 
  opercular 
  bones, 
  

   though 
  very 
  fragmentary, 
  exhibit 
  the 
  characteristic 
  tuber- 
  

   culations 
  ; 
  some 
  of 
  the 
  circumorbital 
  bones 
  are 
  distinct, 
  

   and 
  the 
  large 
  upwardly-directed 
  anterior 
  process 
  of 
  the 
  

   suboperculum 
  is 
  conspicuous. 
  There 
  are 
  traces 
  of 
  large 
  

   postclavicular 
  scales 
  ; 
  and 
  there 
  are 
  prominent 
  fulcra 
  on 
  

   the 
  anterior 
  ray 
  of 
  the 
  pectoral 
  fin. 
  Purchased, 
  1836. 
  

  

  