﻿68 
  ACTINOPTEEYGII. 
  

  

  Sargodon 
  tomicus, 
  Plieninger. 
  

  

  1847. 
  Sargodon 
  tomicus, 
  T. 
  Plieninger, 
  "Wiirtt. 
  Jahresh. 
  vol. 
  iii. 
  p. 
  165, 
  

  

  pi. 
  i. 
  figs. 
  5-10. 
  

   1858. 
  Sargodon 
  tomicus, 
  F. 
  A. 
  Quenstedt, 
  Der 
  Jura, 
  p. 
  35, 
  pi. 
  ii. 
  figs. 
  34, 
  . 
  

  

  35 
  (? 
  figs. 
  36-38). 
  

  

  Type. 
  Teeth 
  ; 
  Stuttgart 
  Museum. 
  

  

  The 
  type 
  species, 
  known 
  only 
  by 
  detached 
  teeth, 
  which 
  sometimes 
  

   measure 
  O005 
  in 
  the 
  breadth 
  and 
  in 
  the 
  depth 
  of 
  the 
  crown. 
  

   Dental 
  crown 
  robust, 
  arched 
  from 
  side 
  to 
  side 
  and 
  the 
  concavity 
  

   probably 
  being 
  innermost 
  ; 
  cutting-edge 
  smooth, 
  usually 
  obliquely 
  

   truncated 
  by 
  wear. 
  Eoot 
  not 
  much 
  compressed, 
  usually 
  nearly 
  

   quadrangular 
  in 
  section, 
  but 
  with 
  a 
  shallow 
  median 
  longitudinal 
  

   groove 
  on 
  its 
  supposed 
  inner 
  face. 
  

  

  Form. 
  $• 
  Loc. 
  Khaetic 
  : 
  Wiirtemberg 
  and 
  England. 
  

  

  41288. 
  Tooth 
  in 
  bone-bed 
  ; 
  Axminster. 
  Purchased, 
  1869, 
  

  

  P. 
  7401. 
  Three 
  specimens; 
  Aust 
  Cliff, 
  near 
  Bristol. 
  

  

  History 
  unknown. 
  

  

  P. 
  3930. 
  Fine 
  tooth 
  ; 
  Aust 
  Cliff. 
  EnnisJcillen 
  Coll. 
  

  

  Genus 
  COLOBODUS, 
  Agassiz. 
  

  

  [Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  1844, 
  p. 
  237.] 
  

  

  Syn. 
  Asterodon, 
  G. 
  von 
  Miinster, 
  Beitr. 
  Petrefakt. 
  pt. 
  iv. 
  1841, 
  p. 
  140. 
  

   Omplialodus, 
  H. 
  von 
  Meyer, 
  Neues 
  Jahrb. 
  1847, 
  p. 
  574. 
  

   Nephrotics, 
  II. 
  von 
  Meyer, 
  Palaeontogr. 
  vol. 
  i. 
  1851, 
  p. 
  243. 
  

   Thelodus, 
  E. 
  E. 
  Schmid, 
  Nova 
  Acta 
  Acad. 
  Cses. 
  Leop.-Car. 
  

  

  vol. 
  xxix. 
  no. 
  9, 
  1861, 
  p. 
  27 
  (in 
  part). 
  

   Eupleurodus, 
  G. 
  Giirich, 
  Zeitschr. 
  deutsch. 
  geol. 
  Ges. 
  vol. 
  xxxvi. 
  

  

  1884, 
  p. 
  142. 
  

   Dactylolepis, 
  H. 
  Kunisch, 
  ibid. 
  vol. 
  xxxvii. 
  1885, 
  p. 
  594. 
  

  

  An 
  imperfectly 
  definable 
  genus, 
  not 
  yet 
  satisfactorily 
  distinguished 
  

   from 
  Lepidotus, 
  The 
  form 
  and 
  proportions 
  of 
  the 
  head 
  and 
  trunk, 
  

   dentition, 
  squamation, 
  and 
  the 
  situation 
  of 
  the 
  fins 
  seem 
  to 
  be 
  as 
  in 
  

   Lepidotus. 
  In 
  most 
  species, 
  however, 
  the 
  teeth 
  are 
  mammillated 
  

   and 
  more 
  or 
  less 
  striated, 
  while 
  their 
  arrangement 
  has 
  not 
  yet 
  been 
  

   definitely 
  proved 
  to 
  agree 
  with 
  that 
  in 
  the 
  last-named 
  genus 
  ; 
  the 
  

   overlapped 
  border 
  of 
  the 
  flank-scales 
  is 
  of 
  uniform 
  width, 
  and 
  not 
  

   produced 
  at 
  the 
  angles 
  ; 
  while' 
  the 
  dorsal 
  and 
  anal 
  fins 
  seem 
  to 
  be 
  

   relatively 
  more 
  elevated 
  than 
  in 
  Lepidotus, 
  with 
  smaller 
  and 
  more 
  

   regular 
  fulcra. 
  The 
  gular 
  plate 
  has 
  not 
  been 
  discovered. 
  

  

  The 
  genus 
  Colobodus 
  was 
  originally 
  founded 
  upon 
  a 
  fragment 
  of 
  

   dentition 
  from 
  the 
  Muschelkalk 
  of 
  France, 
  and 
  the 
  above 
  state- 
  

  

  