﻿32 
  ACTINOPTERTGII. 
  

  

  described 
  and 
  figured 
  by 
  R. 
  H. 
  Traquair, 
  he. 
  cit. 
  p. 
  251, 
  

   fig. 
  2. 
  The 
  outline-illustration 
  is 
  copied, 
  of 
  slightly 
  more 
  

   than 
  one-half 
  the 
  natural 
  size, 
  in 
  the 
  accompanying 
  fig. 
  6, 
  

   and 
  explained 
  by 
  the 
  lettering. 
  The 
  transverse 
  cleft 
  in 
  the 
  

   pectoral 
  arch, 
  though 
  appearing 
  as 
  if 
  a 
  suture 
  and 
  inter- 
  

   preted 
  as 
  such 
  by 
  Traquair, 
  is 
  proved 
  by 
  other 
  specimens 
  

   to 
  be 
  accidental 
  ; 
  the 
  clavicle 
  thus 
  exhibits 
  a 
  large 
  in- 
  

   ferior 
  limb. 
  Egerton 
  Coll. 
  

  

  P. 
  7396. 
  Head 
  and 
  opercular 
  apparatus, 
  exposed 
  from 
  the 
  left 
  side, 
  

   the 
  aspect 
  being 
  partly 
  lateral 
  and 
  partly 
  ventral. 
  Many 
  

   of 
  the 
  bones 
  are 
  well 
  exhibited, 
  and 
  an 
  elongated 
  element 
  

   between 
  the 
  inferior 
  extremity 
  of 
  the 
  hyomandibular 
  and 
  

   the 
  quadrate 
  region 
  is 
  especially 
  noteworthy 
  ; 
  this 
  may 
  be 
  

   an 
  ossified 
  symplectic, 
  as 
  remarked 
  by 
  Traquair, 
  loc. 
  cit. 
  

   p. 
  250. 
  Purchased. 
  

  

  P. 
  3363-4, 
  P. 
  3370. 
  Three 
  examples 
  of 
  the 
  head 
  and 
  pectoral 
  

   arch, 
  with 
  remains 
  of 
  the 
  pectoral 
  fins, 
  the 
  first 
  shown 
  

   from 
  the 
  dorsal 
  aspect, 
  the 
  others 
  from 
  the 
  lateral 
  aspect. 
  

   The 
  clavicle 
  in 
  each 
  exhibits 
  a 
  large 
  inferior 
  limb 
  and 
  an 
  

   extensive 
  inner 
  laminar 
  expansion 
  ; 
  and 
  the 
  second 
  fossil 
  

   also 
  seems 
  to 
  show, 
  from 
  its 
  external 
  ornamented 
  aspect, 
  

   the 
  small 
  infraclavicle. 
  EnnisHllen 
  Coll. 
  

  

  P. 
  3369, 
  P. 
  3869 
  a, 
  P. 
  4341. 
  Three 
  small 
  slabs 
  of 
  Lias 
  with 
  frag- 
  

   mentary 
  remains 
  of 
  the 
  head 
  and 
  pectoral 
  arch. 
  The 
  

   first 
  and 
  third 
  specimens 
  exhibit, 
  among 
  other 
  bones, 
  

   the 
  maxilla, 
  palatine 
  (or 
  ectopterygoid), 
  suborbital, 
  and 
  

   hyomandibular 
  ; 
  the 
  second 
  specimen 
  displays 
  the 
  clavicle 
  

   and 
  supraclavicle. 
  EnnisHllen 
  Coll. 
  

  

  P. 
  2261 
  a-c. 
  Three 
  fragmentary 
  small 
  examples 
  of 
  the 
  head 
  and 
  

   pectoral 
  arch, 
  the 
  first 
  displaying 
  the 
  operculum, 
  among 
  

   other 
  bones. 
  Egerton 
  Coll. 
  

  

  P. 
  2261 
  d. 
  Small 
  head 
  and 
  right 
  pectoral 
  fin. 
  The 
  maxilla, 
  jugal, 
  

   palatine 
  (ectopterygoid), 
  and 
  inner 
  pterygoid 
  are 
  well 
  dis- 
  

   played. 
  Egerton 
  Coll. 
  

  

  39494. 
  Remains 
  of 
  small 
  head 
  and 
  pectoral 
  fins. 
  Purchased, 
  1865. 
  

  

  P. 
  4341 
  a. 
  Remains 
  of 
  pectoral 
  arch 
  and 
  fins. 
  Enniskillen 
  Coll. 
  

  

  P. 
  4341 
  b. 
  Remains 
  of 
  opercular 
  apparatus 
  and 
  pectoral 
  arch 
  of 
  a 
  

   small 
  fish, 
  displaying 
  both 
  clavicles 
  from 
  the 
  visceral 
  

   aspect, 
  and 
  the 
  infraclavicle 
  from 
  the 
  same 
  aspect 
  on 
  the 
  

  

  ^x 
  

  

  