﻿PACHYCOKMIPiE. 
  

  

  395 
  

  

  P. 
  6011. 
  A 
  contorted 
  specimen 
  about 
  1*5 
  in 
  length, 
  showing 
  the 
  

   paired 
  and 
  caudal 
  fins, 
  noticed 
  in 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  

   [6] 
  vol. 
  xiii. 
  1894, 
  p. 
  511 
  ; 
  Solenhofen. 
  The 
  large 
  trian- 
  

   gular 
  lower 
  suborbital 
  exhibits 
  a 
  few 
  radiating 
  fissures 
  or 
  

   grooves 
  in 
  its 
  hinder 
  half, 
  and 
  it 
  seems 
  to 
  have 
  been 
  

   unornamented 
  except 
  at 
  its 
  superior 
  and 
  inferior 
  borders. 
  

   Eight 
  of 
  the 
  characteristic 
  posterior 
  circumorbital 
  plates 
  

   are 
  preserved, 
  each 
  finely 
  rugose 
  or 
  tuberculated 
  in 
  front 
  ; 
  

   while 
  between 
  this 
  series 
  and 
  the 
  two 
  great 
  suborbitals, 
  

   there 
  are 
  three 
  other 
  irregular 
  plates. 
  The 
  arrangement 
  

   is 
  shown 
  in 
  the 
  restoration 
  of 
  H. 
  insignis, 
  fig. 
  40, 
  p. 
  393. 
  

   The 
  two 
  vomerine 
  teeth 
  are 
  well-preserved. 
  The 
  ossified 
  

   sclerotic 
  is 
  shown 
  in 
  section. 
  21 
  rays 
  can 
  be 
  counted 
  in 
  

   the 
  pectoral 
  fins, 
  all 
  divided 
  distally, 
  and 
  the 
  anterior 
  ones 
  

   are 
  finely 
  tuberculated. 
  The 
  scales 
  exhibit 
  the 
  superficial 
  

   granulations 
  most 
  distinctly 
  in 
  the 
  abdominal 
  region, 
  the 
  

   vertical 
  markings 
  best 
  in 
  the 
  caudal 
  region. 
  

  

  Purchased, 
  1889. 
  

  

  Hypsocormus 
  leedsi, 
  A. 
  S. 
  Woodward. 
  

   [Plate 
  XI. 
  fig. 
  1.] 
  

  

  1889. 
  Hypsocormus 
  leedsi, 
  A. 
  S. 
  Woodward, 
  Geol. 
  Mag. 
  [3] 
  vol. 
  vi. 
  

   p. 
  450. 
  

  

  Type. 
  Eemains 
  of 
  skull 
  ; 
  British 
  Museum. 
  

  

  An 
  imperfectly 
  known 
  species 
  about 
  as 
  large 
  as 
  H. 
  macrodon. 
  

   Snout 
  obtusely 
  pointed, 
  the 
  two 
  sides 
  meeting 
  approximately 
  in 
  a 
  

   right 
  angle 
  at 
  its 
  anterior 
  termination, 
  and 
  the 
  external 
  surface 
  

   finely 
  granulated; 
  the 
  large 
  pair 
  of 
  vomerine 
  teeth 
  inclined 
  much 
  

   forwards 
  and 
  apparently 
  projecting 
  out 
  of 
  the 
  mouth. 
  

  

  Form. 
  6f 
  Log. 
  Oxfordian 
  : 
  Huntingdonshire. 
  

  

  P. 
  6913. 
  The 
  type 
  specimen, 
  comprising 
  rostrum, 
  portion 
  of 
  splenial, 
  

   the 
  two 
  post-frontals, 
  and 
  other 
  fragments 
  of 
  cranium 
  ; 
  

   Oxford 
  Clay, 
  near 
  Peterborough. 
  The 
  inferior 
  aspect 
  of 
  

   the 
  rostrum 
  (PL 
  XI. 
  rig. 
  1) 
  exhibits 
  the 
  basal 
  portion 
  of 
  

   the 
  rignt 
  vomerine 
  tooth 
  (v.) 
  and 
  the 
  socket 
  for 
  that 
  of 
  

   tne 
  left 
  side 
  ; 
  while 
  both 
  of 
  these 
  are 
  shown 
  to 
  be 
  much 
  

   directed 
  forwards 
  and 
  the 
  posterior 
  wall 
  of 
  their 
  socket 
  is 
  

   not 
  ossified. 
  Flanking 
  each 
  tooth 
  externally 
  there 
  is 
  a 
  

   triangular 
  area 
  covered 
  with 
  small 
  conical 
  teeth 
  fused 
  

   with 
  the 
  supporting 
  bone, 
  only 
  the 
  apical 
  portion 
  of 
  each 
  

   enamelled 
  ; 
  and 
  two 
  of 
  the 
  marginal 
  teeth 
  directly 
  in 
  

   front 
  of 
  the 
  vomerine 
  pair 
  are 
  much 
  larger 
  than 
  the 
  others. 
  

  

  