﻿342 
  ACT1N0PTERYGII. 
  

  

  Caturus 
  latipennis 
  (Egerton). 
  

  

  1844. 
  Pachycormus 
  latipennis, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  

  

  p. 
  114 
  (undefined). 
  

   1858. 
  Pachycormus 
  latipennis, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript. 
  Brit. 
  

  

  Organic 
  Eemains, 
  dec. 
  ix. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  3, 
  pi. 
  iii. 
  

  

  Type. 
  Head, 
  with 
  pectoral 
  fin 
  and 
  scales 
  ; 
  British 
  Museum. 
  

  

  An 
  imperfectly 
  definable 
  species 
  closely 
  similar 
  to 
  C. 
  heterurus. 
  

   External 
  head-bones 
  and 
  opercular 
  bones 
  ornamented 
  only 
  in 
  part 
  

   with 
  feeble 
  rugae 
  and 
  tuberculations, 
  the 
  supratemporals 
  and 
  post- 
  

   temporals 
  closely 
  tuberculated 
  ; 
  maxillary 
  teeth 
  small, 
  slender, 
  and 
  

   in 
  close 
  series, 
  and 
  those 
  of 
  the 
  dentary 
  bone 
  large, 
  stout, 
  well- 
  

   spaced. 
  Hypocentra 
  and 
  pleurocentra 
  distinct, 
  robust. 
  Scales 
  of 
  

   moderate 
  size, 
  smooth, 
  

  

  The 
  anterior 
  pectoral 
  fin-rays 
  of 
  this 
  species 
  seem 
  to 
  be 
  some- 
  

   what 
  broader 
  and 
  more 
  arcuated 
  than 
  in 
  C. 
  heterurus. 
  

  

  Form, 
  fy 
  Loc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  P. 
  568. 
  The 
  type 
  specimen, 
  described 
  and 
  figured 
  by 
  Egerton, 
  

   loc. 
  cit. 
  ; 
  Lyme 
  Regis. 
  Enniskillen 
  Coll. 
  

  

  38527. 
  Similar 
  specimen 
  exposed 
  from 
  the 
  left 
  side 
  ; 
  Lyme 
  Begis. 
  

   The 
  pectoral 
  fin 
  is 
  well-preserved, 
  but 
  there 
  are 
  only 
  

   slight 
  traces 
  of 
  slender 
  fulcra. 
  Purchased, 
  1864. 
  

  

  Caturus 
  agassizi 
  (Egerton). 
  

  

  1858. 
  Endactis 
  agassizi, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript. 
  Brit. 
  Organic 
  

   Remains, 
  dec. 
  ix. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  4, 
  pi. 
  iv. 
  

  

  Type. 
  Fragmentary 
  head 
  and 
  trunk 
  ; 
  British 
  Museum. 
  

  

  The 
  type 
  species 
  of 
  the 
  so-called 
  genus 
  Endactis, 
  attaining 
  a 
  length 
  

   of 
  about 
  0*3. 
  The 
  proportions 
  being 
  apparently 
  similar 
  to 
  those 
  of 
  

   C. 
  heterurus, 
  it 
  remains 
  doubtful 
  whether 
  the 
  fish 
  is 
  not 
  merely 
  the 
  

   young 
  of 
  the 
  latter 
  species 
  ; 
  but 
  in 
  the 
  specimens 
  mentioned 
  below 
  

   the 
  scales 
  seem 
  to 
  be 
  relatively 
  smaller 
  and 
  more 
  conspicuously 
  

   crimped, 
  while 
  ossifications 
  in 
  the 
  notochordal 
  sheath 
  are 
  very 
  

   feeble 
  or 
  absent. 
  The 
  crimpings 
  on 
  the 
  scales 
  sometimes 
  radiate 
  

   more 
  or 
  less. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  P. 
  567. 
  The 
  type 
  specimen, 
  very 
  fragmentary, 
  showing 
  the 
  greater 
  

   part 
  of 
  the 
  squamation 
  of 
  the 
  right 
  side 
  from 
  within 
  ; 
  

   Lyme 
  Regis. 
  There 
  are 
  distinct 
  indications 
  of 
  large 
  

  

  