﻿320 
  ACTINOrTERTGII. 
  

  

  P. 
  860-1, 
  P. 
  2023. 
  A 
  fine 
  portion 
  of 
  the 
  abdominal 
  squamation, 
  

   from. 
  Boll 
  ; 
  and 
  two 
  imperfect 
  heads 
  with 
  remains 
  of 
  the 
  

   trunk 
  and 
  fins, 
  from 
  Ohmden, 
  near 
  Boll. 
  Egerton 
  Coll. 
  

  

  22534. 
  Imperfect 
  head, 
  pectoral 
  fin, 
  and 
  anterior 
  abdominal 
  scales 
  ; 
  

   Boll. 
  Purchased, 
  1848. 
  

  

  19655-56. 
  Greater 
  portion 
  of 
  trunk 
  in 
  impression, 
  and 
  imperfect 
  

   remains 
  of 
  another 
  specimen 
  preserved 
  from 
  the 
  origin 
  of 
  

   the 
  dorsal 
  fin 
  backwards 
  ; 
  Boll. 
  There 
  are 
  no 
  distinct 
  

   traces 
  of 
  vertebral 
  rings 
  in 
  the 
  caudal 
  region, 
  although 
  

   circumstances 
  are 
  favourable 
  to 
  the 
  exposure 
  of 
  these 
  if 
  

   they 
  were 
  present 
  in 
  the 
  second 
  specimen. 
  

  

  Purchased, 
  1845. 
  

  

  P. 
  3690. 
  Very 
  imperfect 
  but 
  typical 
  large 
  specimen 
  ; 
  locality 
  

   doubtful, 
  but 
  labelled 
  " 
  Lower 
  Lias, 
  Lyme 
  Regis." 
  

  

  Erwiskillen 
  Coll. 
  

  

  Ptycholepis 
  gracilis, 
  Davis. 
  

   1884. 
  Ptycholepis 
  gracilis, 
  J. 
  W. 
  Davis, 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  [5] 
  

   vol. 
  xiii. 
  p. 
  335, 
  pi. 
  x. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  J. 
  W. 
  Davis 
  Collection, 
  Halifax. 
  

  

  A 
  comparatively 
  slender 
  species 
  of 
  moderate 
  size, 
  the 
  length 
  of 
  

   the 
  head 
  equalling 
  the 
  maximum 
  depth 
  of 
  the 
  trunk 
  and 
  contained 
  

   nearly 
  five 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Scales 
  differing 
  

   from 
  those 
  of 
  the 
  type 
  species 
  in 
  the 
  presence 
  of 
  a 
  few 
  feeble 
  but 
  

   conspicuous 
  vertical 
  folds 
  of 
  ganoine 
  at 
  the 
  anterior 
  overlapped 
  

   border. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  39864. 
  Bemains 
  of 
  a 
  much 
  abraded 
  small 
  head 
  and 
  trunk 
  with 
  

   pectoral 
  fins 
  ; 
  Lyme 
  Begis. 
  Purchased, 
  1866. 
  

  

  P. 
  4242. 
  Much 
  crushed 
  remains 
  of 
  a 
  large 
  trunk 
  with 
  paired 
  fins 
  : 
  

   Lyme 
  Begis. 
  Two 
  of 
  the 
  enlarged 
  pelvic 
  scales 
  are 
  shown. 
  

  

  EnnisTcillen 
  Coll. 
  

  

  P. 
  859. 
  Imperfect 
  remains 
  of 
  a 
  large 
  specimen 
  doubtfully 
  of 
  this 
  

   species, 
  probably 
  referred 
  to 
  by 
  Egerton, 
  Pigs. 
  & 
  Descript. 
  

   Brit. 
  Organic 
  Bemains, 
  dec. 
  viii. 
  (Mem. 
  Geo!. 
  Surv.), 
  no. 
  8, 
  

   p. 
  3; 
  Lyme 
  Begis. 
  The 
  detached 
  left 
  subopercu]um, 
  

   exposed 
  from 
  the 
  inner 
  aspect, 
  exhibits 
  no 
  ascending 
  

   anterior 
  process. 
  Egerton 
  Coll. 
  

  

  