﻿ErGNATHID^. 
  327 
  

  

  than 
  broad, 
  and 
  much 
  broader 
  below 
  than 
  above, 
  while 
  

   its 
  external 
  face 
  is 
  finely 
  and 
  closely 
  tuberculated. 
  The 
  

   basals 
  of 
  the 
  pectoral 
  fins 
  are 
  long 
  and 
  slender, 
  constricted 
  

   mesially, 
  and 
  more 
  than 
  six 
  in 
  number. 
  Appearances 
  are 
  

   not 
  quite 
  clear, 
  but 
  the 
  largest 
  basal 
  seems 
  to 
  be 
  the 
  

   hindermost. 
  Some 
  of 
  the 
  scales 
  exhibit 
  the 
  very 
  large 
  

   peg-and-socket 
  articulation 
  ; 
  and 
  others 
  are 
  finely 
  orna- 
  

   mented, 
  showing 
  the 
  tubercles 
  passing 
  into 
  stria? 
  poste- 
  

   riorly. 
  Egerton 
  Coll. 
  

  

  P. 
  3655. 
  Imperfect 
  trunk 
  noticed 
  by 
  Egerton, 
  he. 
  cit. 
  ; 
  Lyme 
  

   Regis. 
  The 
  specimen 
  is 
  much 
  disturbed 
  by 
  crushing, 
  and 
  

   so 
  probably 
  does 
  not 
  afford 
  a 
  correct 
  idea 
  of 
  the 
  form 
  of 
  

   the 
  fish, 
  the 
  caudal 
  pedicle 
  being 
  deepened 
  and 
  the 
  fins 
  

   somewhat 
  displaced 
  and 
  fragmentary. 
  There 
  are 
  separate 
  

   hypocentra 
  and 
  pleurocentra, 
  as 
  in 
  the 
  type 
  specimen, 
  

   none 
  fused 
  together. 
  Each 
  hypocentrum 
  in 
  the 
  abdominal 
  

   region 
  is 
  semicircular, 
  flattened 
  and 
  indented 
  with 
  two 
  

   longitudinally-elongated 
  pits 
  on 
  its 
  inferior 
  face, 
  bearing 
  

   a 
  pair 
  of 
  short 
  lateral 
  processes 
  for 
  the 
  support 
  of 
  the 
  

   ribs. 
  The 
  pleurocentra 
  are 
  too 
  imperfectly 
  shown 
  for 
  

   description. 
  There 
  are 
  remains 
  of 
  the 
  much-elongated 
  

   basals 
  of 
  the 
  pectoral 
  fin, 
  and 
  one 
  of 
  the 
  robust, 
  hour- 
  

   glass-shaped 
  pelvic 
  bones 
  is 
  preserved. 
  The 
  median 
  fins 
  

   are 
  in 
  great 
  part 
  destroyed. 
  The 
  scales 
  are 
  shown 
  in 
  

   undisturbed 
  order 
  dorsally 
  for 
  some 
  distance 
  in 
  advance 
  of 
  

   the 
  dorsal 
  fin 
  ; 
  and 
  many 
  narrow 
  scales 
  of 
  the 
  ventral 
  

   aspect 
  are 
  exhibited. 
  The 
  scale-ornament 
  is 
  well 
  pre- 
  

   served, 
  and 
  the 
  tubercles 
  rarely 
  pass 
  into 
  striae 
  on 
  the 
  

   hinder 
  half 
  of 
  the 
  scale. 
  Ennislcillen 
  Coll. 
  

  

  P. 
  3648. 
  Type 
  specimen 
  of 
  the 
  so-called 
  Harpactira 
  (Harpactes) 
  

   veloa\ 
  described 
  by 
  Egerton, 
  loc. 
  cit. 
  ; 
  Lyme 
  Regis. 
  This 
  

   is 
  a 
  curiously 
  preserved 
  specimen 
  about 
  one 
  metre 
  in 
  

   length, 
  with 
  remains 
  of 
  all 
  the 
  fins 
  except 
  the 
  anal 
  

   nearly 
  in 
  position, 
  but 
  wanting 
  the 
  whole 
  of 
  the 
  axial 
  

   skeleton 
  of 
  the 
  trunk, 
  and 
  showing 
  only 
  a 
  few 
  traces 
  of 
  

   the 
  squamation. 
  The 
  head 
  is 
  very 
  imperfect 
  and 
  obliquely 
  

   crushed. 
  The 
  greater 
  part 
  of 
  the 
  right 
  mandibular 
  ramus 
  

   is 
  exhibited 
  from 
  the 
  inner 
  aspect. 
  The 
  dentary 
  is 
  much 
  

   fractured 
  in 
  front, 
  though 
  showing 
  the 
  coronoid 
  elevation 
  

   behind 
  ; 
  while 
  the 
  splenial 
  is 
  displaced, 
  but 
  sufficiently 
  

   complete 
  to 
  exhibit 
  its 
  clustered 
  small 
  slender 
  teeth 
  and 
  

   the 
  excavation 
  of 
  its 
  hinder 
  margin. 
  Some 
  of 
  the 
  charac- 
  

  

  