﻿366 
  ACTTNOPTKRYGTT. 
  

  

  Megalurus 
  damoni, 
  Egerton. 
  

  

  1858. 
  Megalurus 
  damoni, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Deacript. 
  Brit. 
  

  

  Organic 
  Remains, 
  dec. 
  ix. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  8, 
  pi. 
  viii. 
  

   1873. 
  Megalurus 
  damoni, 
  V. 
  Thiolliere, 
  Poiss. 
  Foss. 
  Bugey, 
  pt. 
  ii. 
  

  

  p. 
  22, 
  pi. 
  ix. 
  

  

  Type. 
  Imperfect 
  fishes 
  ; 
  British 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*3. 
  Head 
  with 
  opercular 
  

   apparatus 
  occupying 
  about 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish, 
  

   and 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle 
  contained 
  scarcely 
  five 
  times 
  in 
  

   the 
  length 
  from 
  the 
  hinder 
  border 
  of 
  the 
  operculum 
  to 
  the 
  base 
  of 
  

   the 
  middle 
  caudal 
  fin-rays. 
  External 
  bones 
  slightly 
  rugose, 
  other- 
  

   wise 
  not 
  ornamented. 
  Vertebrae 
  not 
  exceeding 
  50 
  in 
  number, 
  each 
  

   with 
  an 
  upper 
  and 
  lower 
  deep 
  lateral 
  iudent. 
  Fins 
  as 
  in 
  the 
  type 
  

   species. 
  Scales 
  apparently 
  all 
  much 
  broader 
  than 
  deep. 
  

  

  Form. 
  Sf 
  Loc. 
  Purbeckian 
  : 
  Dorsetshire. 
  Lower 
  Kimmeridgian 
  

   (Lithographic 
  Stone) 
  : 
  Ain, 
  France. 
  

  

  P. 
  563, 
  P. 
  3660. 
  The 
  two 
  type 
  specimens 
  ; 
  Bin 
  combe, 
  near 
  Wey- 
  

   mouth. 
  EnnisJcillen 
  Sf 
  Egerton 
  Colls. 
  

  

  41156. 
  Fine 
  specimen 
  0*195 
  in 
  length; 
  Isle 
  of 
  Portland. 
  The 
  

   caudal 
  region 
  is 
  fractured 
  and 
  thus 
  in 
  part 
  somewhat 
  

   obscured, 
  but 
  there 
  cannot 
  have 
  been 
  many 
  alternating 
  

   hypocentra 
  and 
  pleurocentra. 
  Purchased, 
  1868. 
  

  

  P. 
  3661. 
  Smaller, 
  more 
  imperfect 
  fish 
  apparently 
  showing 
  more 
  

   numerous 
  alternating 
  hypocentra 
  and 
  pleurocentra 
  in 
  the 
  

   caudal 
  region 
  ; 
  near 
  Weymouth. 
  EnnisJcillen 
  Coll. 
  

  

  41171. 
  Two 
  halves 
  of 
  a 
  large 
  fish 
  on 
  the 
  alternate 
  halves 
  of 
  coun- 
  

   terpart 
  slabs 
  ; 
  Isle 
  of 
  Portland. 
  Purchased, 
  1868. 
  

  

  Megalurus 
  austeni, 
  Egerton. 
  

  

  1858. 
  Megalurus 
  austeni, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript. 
  Brit. 
  

  

  Organic 
  Remains, 
  dec. 
  ix. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  9, 
  pi. 
  ix. 
  • 
  

   1858. 
  Attakeopsis 
  (?) 
  austeni, 
  V. 
  Thiolliere, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  [2] 
  

  

  vol. 
  xv. 
  p. 
  785. 
  

  

  Type. 
  Imperfect 
  head 
  and 
  abdominal 
  region 
  ; 
  British 
  Museum. 
  

  

  An 
  imperfectly 
  known 
  and 
  indefinable 
  species 
  closely 
  resembling 
  

   M. 
  damoni, 
  having 
  similar 
  vertebrae 
  but 
  apparently 
  differing 
  in 
  the 
  

   relatively 
  much 
  greater 
  depth 
  of 
  the 
  scales 
  in 
  the 
  abdominal 
  region. 
  

  

  Form. 
  § 
  Loc. 
  Purbeckian 
  : 
  Dorsetshire. 
  1 
  

  

  1 
  The 
  species 
  is 
  supposed 
  by 
  Thiolliere 
  (loc. 
  cit.) 
  to 
  occur 
  also 
  in 
  the 
  Litho- 
  

   graphic 
  Stone 
  of 
  Cirin, 
  France. 
  

  

  