﻿pycnodontid^]. 
  281 
  

  

  Genekically 
  Indeterminable 
  Ceetaceotjs 
  Pycnodonts. 
  

  

  The 
  following 
  species 
  represented 
  in 
  the 
  Collection 
  have 
  been 
  

   founded 
  upon 
  very 
  fragmentary 
  evidence 
  and 
  cannot 
  as 
  yet 
  be 
  

   generically 
  determined. 
  

  

  Acrotemnus 
  fab 
  a, 
  Agassiz. 
  

  

  1837-44. 
  Acrotemnus 
  f 
  aba, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  p. 
  203, 
  

  

  pi. 
  lxvi. 
  a. 
  figs. 
  16-18. 
  

   1887. 
  Ccelodus 
  f 
  aba, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palseont. 
  vol. 
  iii. 
  p. 
  249. 
  

  

  Type. 
  Group 
  of 
  five 
  teeth 
  ; 
  British 
  Museum. 
  

  

  A 
  generic 
  and 
  specific 
  name 
  based 
  upon 
  the 
  specimen 
  mentioned 
  

   below. 
  The 
  teeth 
  are 
  smooth 
  and 
  bean-shaped, 
  each 
  with 
  a 
  sharp, 
  

   keel-like 
  coronal 
  summit 
  overhanging 
  a 
  slight 
  indent 
  which 
  has 
  a 
  

   feebly-crimped 
  inferior 
  margin. 
  They 
  may 
  perhaps 
  be 
  the 
  principal 
  

   lower 
  teeth 
  of 
  a 
  species 
  of 
  Ccelodus. 
  

  

  Form. 
  Sj 
  % 
  Loc. 
  Senonian 
  : 
  Sussex. 
  

  

  4584. 
  Type 
  specimen 
  ; 
  Chalk, 
  Lewes. 
  The 
  largest 
  tooth 
  measures 
  

   0-014 
  in 
  width. 
  Mantel! 
  Coll. 
  

  

  Pycnodiis 
  scrobiculatus, 
  Eeuss. 
  

  

  1845. 
  Pycnodus 
  scrobicidatus, 
  A. 
  E. 
  Reuss, 
  Verstein. 
  bohm. 
  Kreideform. 
  

  

  pt. 
  i. 
  p. 
  10, 
  pi. 
  iv. 
  figs. 
  15-25. 
  

   1845. 
  Pycnodus 
  rostratus, 
  A. 
  E. 
  Reuss, 
  ibid. 
  p. 
  10, 
  pi. 
  iv. 
  fig. 
  37. 
  

   1845. 
  Pycnodus 
  semilunaris, 
  A. 
  E. 
  Reuss, 
  ibid. 
  p. 
  10, 
  pi. 
  iv.figs. 
  43-45. 
  

   1856. 
  Pycnodus 
  scrobiculatus, 
  C. 
  E. 
  Fischer, 
  Allg. 
  deutsche 
  Nat. 
  Zeit. 
  

  

  n. 
  s. 
  vol. 
  ii. 
  p. 
  138, 
  figs. 
  8-16. 
  

   1856. 
  Ctenoptychius?, 
  C. 
  E. 
  Fischer, 
  ibid. 
  p. 
  138, 
  figs. 
  17-20. 
  

  

  1874. 
  Pycnodus 
  semilunaris, 
  St. 
  Zarecznego, 
  Sprawozd, 
  Komisyi. 
  

   Fizyjograf. 
  Galicyi, 
  vol. 
  viii. 
  p. 
  (128), 
  pi. 
  i. 
  fig. 
  4. 
  

  

  1875. 
  Pycnodus 
  scrobiculatus, 
  H. 
  B, 
  Geinitz, 
  Palseontogr. 
  vol. 
  xx. 
  pt. 
  i. 
  

   p. 
  301, 
  pi. 
  lxv. 
  figs. 
  22-32. 
  

  

  1878. 
  Pycnodus 
  scrobiculatus, 
  A. 
  Fritsch, 
  Rept. 
  u. 
  Fische 
  bohm. 
  

  

  Kreideform. 
  p. 
  22, 
  pi. 
  ii. 
  figs. 
  6, 
  7. 
  

   1893. 
  Pycnodus 
  scrobiculatus, 
  A. 
  S. 
  Woodward, 
  Geol. 
  Mag. 
  [3] 
  vol. 
  x. 
  

  

  p. 
  492, 
  pi. 
  xvii. 
  fig. 
  7. 
  

  

  Type. 
  Detached 
  teeth. 
  

  

  The 
  teeth 
  of 
  this 
  form 
  are 
  tumid 
  and 
  coarsely 
  punctate, 
  apparently 
  

   almost 
  conical 
  when 
  unworn. 
  They 
  are 
  of 
  very 
  small 
  size, 
  and 
  

   have 
  hitherto 
  been 
  found 
  arranged 
  only 
  in 
  three 
  longitudinal 
  series 
  

   on 
  a 
  narrow 
  vomer. 
  The 
  median 
  and 
  lateral 
  teeth 
  are 
  about 
  equal 
  

   in 
  size, 
  and 
  the 
  latter 
  are 
  truncated 
  at 
  their 
  outer 
  border. 
  

  

  Form. 
  § 
  Loc. 
  Cenomanian 
  (Lower 
  Plan 
  erkalk): 
  Kosstitz, 
  Bohemia: 
  

   Galicia. 
  Senonian 
  : 
  Sussex 
  and 
  Kent. 
  

  

  