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  ACTINOFTERYGII. 
  

  

  Belonostomus 
  cinctus, 
  Agassiz, 
  

  

  1837-44. 
  Belonostomus 
  cinctus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  

  

  p. 
  142, 
  pi. 
  lxvi. 
  a. 
  figs. 
  10-13. 
  

   1850. 
  Belonostomus 
  cinctus, 
  F. 
  Dixon, 
  Geol. 
  Sussex, 
  p. 
  367, 
  pi. 
  xxxv. 
  

  

  figs. 
  3, 
  3*. 
  

   1888. 
  Belonostomus 
  cinctus, 
  A. 
  S.Woodward, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

  

  vol. 
  xliv. 
  p. 
  145, 
  pi. 
  vii. 
  figs. 
  7-13. 
  

  

  Type. 
  Portion 
  of 
  squamation 
  ; 
  British 
  Museum. 
  

  

  An 
  imperfectly 
  known 
  species 
  of 
  large 
  size, 
  the 
  cranium 
  attaining 
  

   a 
  length 
  of 
  at 
  least 
  0*24. 
  Jaws 
  very 
  slender, 
  the 
  presymphysial 
  

   bone 
  15 
  times 
  as 
  long 
  as 
  its 
  maximum 
  depth, 
  keeled 
  below, 
  

   marked 
  with 
  feeble 
  longitudinal 
  striae, 
  and 
  overlapping 
  the 
  mandi- 
  

   bular 
  symphysis 
  in 
  an 
  oblique 
  suture 
  ; 
  teeth 
  obtuse, 
  mammillated, 
  

   on 
  the 
  splenial 
  bone, 
  and 
  the 
  median 
  series 
  on 
  the 
  presymphysial 
  

   bone 
  large, 
  sharply 
  conical, 
  and 
  well-spaced. 
  Scales 
  of 
  flank 
  

   smooth, 
  those 
  of 
  the 
  dorsal 
  region 
  marked 
  with 
  delicate 
  longitudinal 
  

   rugae 
  ; 
  the 
  scales 
  of 
  the 
  lateral 
  line 
  truncated 
  inferiorly 
  and 
  much 
  

   exceeding 
  in 
  depth 
  the 
  series 
  below, 
  those 
  on 
  the 
  anterior 
  portion 
  

   of 
  the 
  abdominal 
  region 
  being 
  about 
  four 
  times 
  as 
  deep 
  as 
  broad. 
  

  

  A 
  mandible 
  of 
  this 
  species 
  in 
  the 
  Brighton 
  Museum 
  shows 
  the 
  

   dentary 
  completely 
  excluded 
  by 
  the 
  splenial 
  from 
  the 
  oral 
  border. 
  

  

  Form. 
  fy 
  Loc. 
  Upper 
  Cretaceous 
  : 
  S.E. 
  England. 
  

  

  4266. 
  Type 
  specimen 
  showing 
  inner 
  aspect 
  of 
  part 
  of 
  the 
  squama- 
  

   tion 
  of 
  the 
  flank, 
  described 
  and 
  figured 
  by 
  Agassiz, 
  Poiss. 
  

   Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  p. 
  142, 
  pi. 
  lxvi. 
  a. 
  fig. 
  13 
  ; 
  Upper 
  

   Chalk, 
  Lewes, 
  Sussex. 
  Mantell 
  Coll. 
  

  

  P. 
  7578. 
  Fragment 
  of 
  squamation 
  showing 
  smooth 
  flank-scales 
  and 
  

   ornamented 
  dorsal 
  scales 
  ; 
  English 
  Chalk. 
  

  

  History 
  unknown. 
  

  

  4267, 
  4268. 
  Two 
  imperfect 
  presymphysial 
  bones, 
  noticed 
  and 
  

   figured 
  by 
  Agassiz, 
  loc. 
  cit. 
  p. 
  142, 
  pi. 
  lxvi. 
  a. 
  figs. 
  10-12 
  ; 
  

   Lewes. 
  Mantell 
  Coll. 
  

  

  39057. 
  Presymphysial 
  bone, 
  split 
  longitudinally 
  ; 
  Chalk, 
  Burham, 
  

   Kent. 
  Bowerbanlc 
  Coll. 
  

  

  P. 
  3804. 
  Portion 
  of 
  presymphysial 
  bone 
  ; 
  Burham. 
  

  

  Enniskillen 
  Coll. 
  

  

  P. 
  5627. 
  Portion 
  of 
  presymphysial 
  bone 
  ; 
  Kent. 
  Harford 
  Coll. 
  

  

  