﻿PACHFCORMIDvE. 
  401 
  

  

  1888. 
  Protosphyrcena 
  ferox, 
  A. 
  S. 
  Woodward, 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  x. 
  

  

  p. 
  321. 
  

   1895. 
  Protosphyrcena 
  ferox, 
  A. 
  S. 
  Woodward, 
  Geol. 
  Mag. 
  [4] 
  vol. 
  ii. 
  

  

  p. 
  211, 
  woodcut 
  fig. 
  3. 
  

  

  Type. 
  Teeth 
  ; 
  British 
  Museum. 
  

  

  The 
  type 
  species. 
  Rostrum 
  much 
  elongated 
  and 
  attaining 
  a 
  

   length 
  of 
  about 
  03 
  with 
  a 
  transverse 
  diameter 
  of 
  0*05 
  at 
  its 
  base 
  

   where 
  the 
  vomerine 
  teeth 
  are 
  implanted 
  ; 
  circular 
  in 
  transverse 
  

   section 
  throughout 
  its 
  whole 
  length, 
  except 
  within 
  a 
  short 
  distance 
  

   of 
  the 
  vomerine 
  teeth, 
  where 
  it 
  becomes 
  slightly 
  flattened 
  on 
  the 
  

   upper 
  part 
  of 
  its 
  sides 
  and 
  the 
  top 
  and 
  passes 
  into 
  the 
  gradually 
  

   widening 
  flattened 
  cranial 
  roof; 
  its 
  external 
  surface 
  ornamented 
  

   with 
  reticulating 
  rugae, 
  of 
  which 
  the 
  most 
  prominent 
  are 
  longitudi- 
  

   nally 
  directed. 
  Cranial 
  roof 
  more 
  finely 
  rugose 
  and 
  tuberculated. 
  

   Teeth 
  sometimes 
  smooth, 
  but 
  usually 
  with 
  slight 
  longitudinal 
  

   wrinkles, 
  which 
  cause 
  splits 
  in 
  the 
  enamel 
  of 
  the 
  fossils 
  ; 
  the 
  acute 
  

   edges 
  not 
  serrated. 
  Symphysial 
  extremity 
  of 
  each 
  dentary 
  bearing 
  

   three 
  large 
  teeth, 
  and 
  its 
  oral 
  border 
  toothless 
  where 
  apposed 
  to 
  

   the 
  dentigerous 
  part 
  of 
  the 
  splenial 
  ; 
  splenial 
  with 
  two 
  large 
  teeth, 
  

   and 
  smaller 
  teeth 
  in 
  front 
  but 
  none 
  behind. 
  

  

  Form. 
  <$f 
  Loc. 
  Senonian, 
  Turonian, 
  and 
  Cenomanian 
  : 
  S.E. 
  Eng- 
  

   land. 
  (?) 
  Cenomanian 
  : 
  Kursk, 
  Eussia. 
  

  

  P. 
  6529. 
  Very 
  fine 
  rostrum, 
  measuring 
  0-28 
  from 
  the 
  vomerine 
  

   teeth 
  to 
  its 
  incomplete 
  distal 
  extremity, 
  showing 
  a 
  frag- 
  

   ment 
  of 
  the 
  anterior 
  part 
  of 
  the 
  cranial 
  roof 
  and 
  associated 
  

   with 
  pyritised 
  remains 
  of 
  the 
  anterior 
  half 
  of 
  the 
  right 
  

   mandibular 
  ramus 
  ; 
  Lower 
  Chalk, 
  Blue 
  Bell 
  Hill, 
  Burham, 
  

   Kent. 
  The 
  internal 
  cavity 
  of 
  the 
  rostrum 
  at 
  its 
  base 
  is 
  

   subdivided 
  by 
  a 
  median 
  vertical 
  septum 
  which 
  is 
  shown 
  

   considerably 
  in 
  advance 
  of 
  the 
  vomerine 
  teeth 
  ; 
  and 
  the 
  

   outer 
  surface 
  of 
  the 
  rostrum 
  exhibits 
  the 
  characteristic 
  

   ornamentation. 
  The 
  vomerine 
  tooth 
  of 
  the 
  right 
  side 
  is 
  

   completely 
  preserved, 
  but 
  on 
  the 
  left 
  there 
  is 
  only 
  the 
  

   apex 
  of 
  what 
  seems 
  to 
  be 
  a 
  successional 
  tooth. 
  Two 
  of 
  

   the 
  much 
  larger 
  anteriorly-projecting 
  teeth 
  of 
  the 
  dentary 
  

   are 
  also 
  exposed 
  ; 
  and 
  part 
  of 
  the 
  series 
  of 
  diminutive 
  

   teeth 
  is 
  preserved 
  on 
  its 
  oral 
  border 
  behind 
  the 
  region 
  of 
  

   the 
  splenial. 
  Presented 
  by 
  S. 
  J. 
  Hawkins, 
  Esq., 
  1891. 
  

  

  P. 
  3955-56. 
  A 
  much 
  abraded, 
  fractured, 
  and 
  partially 
  crushed 
  

   rostrum, 
  associated 
  with 
  the 
  mandible 
  and 
  other 
  frag- 
  

   ments 
  ; 
  Chalk, 
  Kent. 
  Only 
  the 
  right 
  vomerine 
  tooth 
  is 
  

   preserved, 
  and 
  the 
  hollow 
  portion 
  of 
  rostrum 
  above 
  it 
  is 
  

   paet 
  in. 
  2d 
  

  

  