﻿102 
  ACTINOPTEETGII. 
  

  

  irregular 
  longitudinal 
  series, 
  the 
  largest 
  posterior 
  teeth 
  comprising 
  

   two 
  pairs 
  with 
  one 
  median 
  tooth 
  in 
  advance. 
  

  

  Form. 
  4* 
  Loc. 
  Upper 
  Corallian 
  and 
  Kimmeridgian 
  : 
  Hanover 
  l 
  . 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Lepidotus 
  unguiculatus, 
  Agassiz. 
  

  

  1829. 
  " 
  Schuppenhaut 
  eines 
  unhestimmharen 
  Eeptils," 
  E. 
  Riippell, 
  

   Abbild. 
  u. 
  Beschreib. 
  Verstein. 
  Solenhofen, 
  p. 
  11, 
  pi. 
  iv. 
  

  

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

  

  1833-37. 
  Lepidotus 
  unguiculatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

   pp. 
  9, 
  251, 
  pi. 
  xxx. 
  figs. 
  7-9 
  (non 
  p. 
  254 
  ; 
  pi. 
  xxix. 
  c. 
  fig. 
  1). 
  

  

  1863. 
  Lepidotus 
  unguiculatus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wise., 
  

   inath.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  623. 
  

  

  Type. 
  Portion 
  of 
  squamation. 
  

  

  So 
  far 
  as 
  can 
  be 
  ascertained 
  from 
  the 
  descriptions 
  of 
  Agassiz 
  and 
  

   Wagner, 
  the 
  fine 
  specimen 
  mentioned 
  below 
  pertains 
  to 
  L. 
  unguicu- 
  

   latus 
  and 
  justifies 
  the 
  following 
  diagnosis. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*8. 
  Trunk 
  robust, 
  the 
  

   length 
  of 
  the 
  head 
  with 
  opercular 
  apparatus 
  equalling 
  about 
  two- 
  

   thirds 
  the 
  maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  occupying 
  somewhat 
  

   more 
  than 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Maximum 
  

   width 
  of 
  operculum 
  slightly 
  exceeding 
  half 
  its 
  depth, 
  and 
  equalling 
  

   about 
  one-third 
  the 
  length 
  of 
  the 
  head. 
  External 
  bones 
  apparently 
  

   smooth 
  or 
  sparsely 
  ornamented. 
  Teeth 
  short 
  and 
  stout 
  and 
  smooth, 
  

   the 
  majority 
  oval 
  in 
  outline 
  and 
  with 
  a 
  well-defined 
  median 
  coronal 
  

   tubercle 
  or 
  apex. 
  Fin-fulcra 
  very 
  large 
  on 
  the 
  dorsal 
  fin, 
  com- 
  

   paratively 
  small 
  on 
  the 
  anal 
  and 
  lower 
  lobe 
  of 
  the 
  caudal 
  fin 
  ; 
  all 
  

   the 
  median 
  fin-rays 
  especially 
  robust. 
  Pelvic 
  fins 
  arising 
  nearer 
  to 
  

   the 
  anal 
  than 
  to 
  the 
  pectorals 
  ; 
  anal 
  fin 
  arising 
  opposite 
  the 
  posterior 
  

   extremity 
  of 
  the 
  dorsal. 
  Scales 
  smooth, 
  none 
  serrated, 
  but 
  the 
  

   postero-inferior 
  angle 
  more 
  or 
  less 
  produced, 
  and 
  the 
  hinder 
  margin 
  

   often 
  with 
  one 
  or 
  two 
  notches 
  immediately 
  above 
  this 
  ; 
  dorsal 
  ridge- 
  

   scales 
  acutely 
  pointed 
  but 
  inconspicuous. 
  

  

  Form.df 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Bavaria. 
  

  

  37022. 
  Nearly 
  complete 
  fish 
  0*75 
  in 
  length, 
  with 
  the 
  right 
  operculum 
  

   removed 
  and 
  shown 
  from 
  the 
  inner 
  aspect 
  above 
  the 
  head, 
  

   and 
  part 
  of 
  the 
  abdominal 
  squamation 
  disturbed 
  : 
  Solen- 
  

  

  1 
  Specifically 
  indeterminable 
  scales 
  from 
  the 
  Kimmeridgian 
  and 
  Portlandian 
  

   of 
  N. 
  France 
  (Lepidotus 
  fittoni, 
  H. 
  E. 
  Sauvage, 
  errore, 
  Catal. 
  Poiss. 
  Form. 
  

   Second. 
  Boulonnais, 
  1867, 
  p. 
  18, 
  pi. 
  i. 
  figs. 
  24, 
  25) 
  are 
  also 
  ascribed 
  to 
  this 
  

   species 
  by 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Greol. 
  France, 
  [3 
  J 
  vol. 
  viii. 
  (1880), 
  p. 
  526. 
  

   The 
  so-called 
  pharyngeals 
  of 
  Pgcnodus 
  dutertrei 
  figured 
  by 
  Sauvage, 
  loc. 
  cit. 
  

   1867, 
  ph 
  ii- 
  fig- 
  9, 
  are 
  much 
  like 
  the 
  splenials 
  of 
  L. 
  affinls. 
  

  

  