﻿454 
  ACTINOPTERYGII. 
  

  

  18510-11. 
  Much-fractured 
  specimen 
  in 
  counterpart; 
  Upper 
  Lias, 
  

   Ohmden, 
  Wiirtemberg. 
  The 
  head 
  with 
  opercular 
  appa- 
  

   ratus 
  is 
  contained 
  more 
  than 
  four 
  times, 
  and 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk 
  much 
  less 
  than 
  four 
  times 
  in 
  the 
  total 
  

   length, 
  which 
  measures 
  about 
  015. 
  The 
  cranial 
  roof 
  and 
  

   mandibular 
  ramus 
  are 
  shown 
  to 
  be 
  coarsely 
  rugose. 
  The 
  

   dorsal 
  fin 
  is 
  opposed 
  to 
  the 
  pelvic 
  pair. 
  The 
  scales 
  are 
  

   all 
  smooth, 
  not 
  serrated, 
  while 
  those 
  of 
  the 
  flank 
  are 
  

   much 
  deepened. 
  Purchased, 
  1844. 
  

  

  P. 
  7579. 
  More 
  imperfect 
  specimen, 
  wanting 
  the 
  head 
  ; 
  Ohmden. 
  

  

  Egerton 
  Coll. 
  

  

  Pholi 
  dophorus 
  latins 
  cuius, 
  Agassiz. 
  

  

  [Plate 
  XIV. 
  fig. 
  3.] 
  

  

  1832. 
  Pholidophorus 
  latiusculus, 
  L. 
  Agassiz, 
  Neues 
  Jahrb. 
  p. 
  145. 
  

   1833-44. 
  Pholidophorus 
  latiusculus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  

  

  pt. 
  i. 
  pp. 
  9, 
  287. 
  

   1844. 
  Pholidophorus 
  fusiformis, 
  L. 
  Agassiz, 
  ibid. 
  p. 
  288 
  (name 
  only). 
  

  

  [Fish 
  ; 
  British 
  Museum.] 
  

   1850. 
  Semionotus 
  curtulus, 
  0. 
  G. 
  Costa, 
  Atti 
  Aecad. 
  Pontan. 
  vol. 
  v. 
  

  

  p. 
  294, 
  pi. 
  vii. 
  fig. 
  6, 
  pi. 
  viii. 
  fig. 
  2 
  {non 
  pi. 
  vi. 
  figs. 
  4, 
  5). 
  

   1853. 
  Semionotus 
  curtulus, 
  0. 
  G. 
  Costa, 
  loc. 
  cit. 
  vol. 
  vii. 
  p. 
  9, 
  pi. 
  i. 
  

  

  fig. 
  5. 
  

   1866-67. 
  Pholidophorus 
  latiusculus, 
  R. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  

  

  math.-naturw. 
  CI. 
  vol. 
  liv. 
  pt. 
  i. 
  p. 
  328, 
  pi. 
  iii. 
  figs. 
  2, 
  3, 
  and 
  ibid. 
  

  

  vol. 
  lvi. 
  pt. 
  i. 
  p. 
  903, 
  pi. 
  ii. 
  fig. 
  1 
  . 
  

   1892. 
  Pholidophorus 
  latiusculus, 
  F. 
  Bassani, 
  Mem. 
  Soc. 
  Ital. 
  Sci. 
  [3] 
  

  

  vol. 
  ix. 
  no. 
  3, 
  p. 
  23. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  A 
  small 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*08. 
  Length 
  of 
  

   head 
  with 
  opercular 
  apparatus 
  at 
  least 
  equalling 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk, 
  and 
  occupying 
  about 
  one-quarter 
  of 
  the 
  total 
  

   length 
  of 
  the 
  fish. 
  The 
  rugose 
  ornament 
  of 
  the 
  head 
  and 
  opercular 
  

   bones 
  feeble 
  ; 
  maxilla 
  longitudinally 
  striated. 
  Pelvic 
  fins 
  arising 
  

   considerably 
  in 
  advance 
  of 
  the 
  middle 
  point 
  of 
  the 
  trunk, 
  opposite 
  

   the 
  origin 
  of 
  the 
  dorsal 
  fin. 
  Scales 
  large 
  and 
  smooth, 
  the 
  hinder 
  

   margin 
  very 
  slightly 
  convex 
  and 
  not 
  serrated 
  ; 
  several 
  flank-series 
  

   deeper 
  than 
  broad. 
  

  

  The 
  small 
  specimens 
  of 
  Pholidophorus 
  from 
  the 
  Lower 
  Lias 
  

   of 
  Lyme 
  Regis, 
  Dorsetshire, 
  ascribed 
  to 
  P. 
  latiusculus 
  by 
  Agassiz 
  

   (1844) 
  are 
  now 
  catalogued 
  as 
  young 
  individuals 
  of 
  P. 
  bechei 
  {supra, 
  

   p. 
  450). 
  It 
  may 
  also 
  be 
  added 
  that 
  in 
  the 
  two 
  first 
  drawings 
  

  

  . 
  

  

  