﻿EUGNATEID^. 
  

  

  297 
  

  

  The 
  following 
  specimens 
  were 
  all 
  obtained 
  from 
  the 
  neighbour- 
  

   hood 
  of 
  Lyme 
  Eegis 
  : 
  — 
  

  

  P. 
  2030. 
  Nearly 
  complete 
  fish, 
  with 
  crushed 
  head, 
  shown 
  of 
  two- 
  

   thirds 
  the 
  natural 
  size 
  in 
  PL 
  VI. 
  fig. 
  1. 
  The 
  head 
  is 
  

   obliquely 
  distorted, 
  but 
  its 
  proportions 
  are 
  indicated 
  and 
  

   part 
  of 
  the 
  dentition 
  is 
  well 
  shown. 
  The 
  maxilla 
  (mx.) 
  

   bears 
  small 
  and 
  slender 
  teeth 
  increasing 
  in 
  stoutness 
  

   forwards, 
  and 
  the 
  horizontally 
  extended 
  premaxilla 
  (jpmx.) 
  

   shows 
  a 
  close 
  series 
  of 
  eight 
  or 
  nine 
  robust 
  teeth; 
  the 
  

   dentary 
  bone 
  also 
  exhibits 
  its 
  sparse 
  series 
  of 
  compara- 
  

   tively 
  large 
  and 
  stout 
  teeth. 
  The 
  cheek-plates 
  and 
  

   opercular 
  bones 
  are 
  crushed 
  beyond 
  recognition, 
  and 
  the 
  

   squamation 
  behind 
  is 
  much 
  displaced. 
  Portions 
  of 
  all 
  

   the 
  fins 
  are 
  shown, 
  but 
  only 
  the 
  caudal 
  fin 
  is 
  well 
  pre- 
  

   served. 
  Egerton 
  Coll. 
  

  

  P. 
  2031-33. 
  Two 
  specimens 
  somewhat 
  smaller, 
  and 
  a 
  third 
  fish, 
  still 
  

   smaller, 
  Wanting 
  the 
  caudal 
  fin. 
  The 
  first 
  specimen 
  is 
  

   nearly 
  complete, 
  distorted 
  a 
  little 
  in 
  the 
  caudal 
  region, 
  

   and 
  with 
  good 
  squamation 
  ; 
  the 
  second 
  wants 
  the 
  greater 
  

   part 
  of 
  the 
  skull 
  and 
  jaws 
  ; 
  the 
  third 
  displays 
  the 
  

   opercular 
  bones 
  and 
  the 
  dentition 
  of 
  maxilla 
  and 
  dentary. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  3630, 
  P. 
  3636-38, 
  P. 
  4234. 
  Five 
  specimens 
  more 
  or 
  less 
  

   imperfect, 
  varying 
  in 
  length 
  from 
  033 
  to 
  0-23, 
  and 
  all 
  

   exhibiting 
  part 
  of 
  the 
  dentition. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3634 
  e. 
  A 
  distorted 
  and 
  disturbed 
  specimen, 
  showing 
  some 
  

   scattered 
  bones 
  of 
  the 
  head. 
  The 
  hyomandibular 
  is 
  

   shown 
  to 
  be 
  a 
  laterally-compressed, 
  expanded 
  bone 
  ; 
  and 
  

   the 
  left 
  mandibular 
  ramus 
  (PL 
  IV. 
  fig. 
  3), 
  with 
  its 
  elevated 
  

   coronoid 
  region, 
  is 
  well 
  exposed. 
  Some 
  of 
  the 
  scales 
  

   exhibit 
  a 
  robust 
  peg-and-socket 
  articulation. 
  

  

  Ennish'llen 
  Coll. 
  

  

  38526. 
  A 
  small 
  distorted 
  fish, 
  the 
  trunk 
  chiefly 
  shown 
  in 
  impression. 
  

   Part 
  of 
  the 
  roof 
  of 
  the 
  skull, 
  the 
  left 
  maxillary 
  and 
  

   dentary 
  bones 
  are 
  exhibited; 
  and 
  there 
  is 
  a 
  displaced 
  

   portion 
  of 
  vertebral 
  column, 
  probably 
  of 
  the 
  same 
  fish, 
  

   which 
  seems 
  to 
  comprise 
  ossifications 
  in 
  the 
  notochordal 
  

   sheath. 
  Purchased, 
  1864. 
  

  

  48006. 
  Imperfect 
  fish, 
  ventral 
  aspect, 
  displaying 
  branchial 
  arches, 
  

   the 
  very 
  small 
  anterior 
  ventral 
  scales, 
  and 
  a 
  coprolite 
  at 
  

   the 
  origin 
  of 
  the 
  anal 
  fin. 
  Purchased, 
  1877. 
  

  

  