﻿254 
  ACTIN0PTERYG1I. 
  

  

  28415 
  a. 
  Left 
  splenial, 
  the 
  type 
  specimen 
  of 
  the 
  so-called 
  Gyrodus 
  

   mantelli, 
  Agassiz, 
  loc. 
  cit. 
  ; 
  Tilgate 
  Forest. 
  Mantell 
  Coll. 
  

  

  28415 
  b. 
  Two 
  left 
  splenials 
  ; 
  Tilgate 
  Forest. 
  Mantell 
  Coll. 
  

  

  39215. 
  Imperfect 
  small 
  right 
  splenial 
  dentition 
  ; 
  Wealden, 
  Battle, 
  

   Sussex. 
  Bowerhank 
  Coll. 
  

  

  P. 
  1629. 
  Eight 
  splenial 
  dentition 
  showing 
  irregular 
  subdivision 
  of 
  

   outermost 
  series 
  of 
  teeth 
  ; 
  Tilgate 
  Forest. 
  Egerton 
  Coll. 
  

  

  P. 
  3763. 
  Eight 
  splenial 
  with 
  well-preserved 
  teeth, 
  showing 
  the 
  

   base 
  of 
  a 
  single 
  minute 
  tooth 
  within 
  the 
  principal 
  series 
  ; 
  

   Wealden, 
  near 
  Hastings. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3755. 
  Left 
  splenial 
  dentition, 
  probably 
  of 
  this 
  species 
  ; 
  Purbeck 
  

   Beds, 
  Swanage. 
  The 
  principal 
  teeth 
  and 
  a 
  single 
  minute 
  

   inner 
  tooth 
  are 
  exhibited 
  only 
  by 
  their 
  bases 
  ; 
  the 
  outer- 
  

   most 
  teeth 
  are 
  more 
  robust 
  than 
  is 
  usual 
  in 
  the 
  species. 
  

  

  Enniskillen 
  Coll. 
  

  

  21349. 
  Two 
  more 
  imperfect 
  examples 
  of 
  similar 
  dentition 
  ; 
  

   Swanage. 
  Purchased, 
  1847. 
  

  

  P. 
  7445. 
  Similar 
  right 
  splenial 
  ; 
  Purbeckian 
  (Serpulit), 
  Thiister- 
  

   berg, 
  Hanover. 
  Purchased, 
  1895. 
  

  

  Coelodus 
  gyrodoides, 
  Egerton. 
  

  

  1877. 
  Coelodus 
  gyrodoides, 
  Sir 
  P. 
  Egerton, 
  Geol. 
  Mag. 
  [2] 
  vol. 
  iv. 
  

   p. 
  52, 
  pi. 
  iv. 
  fig. 
  3. 
  

  

  Type. 
  Vomerine 
  dentition 
  ; 
  British 
  Museum. 
  

  

  A 
  large 
  species, 
  known 
  only 
  by 
  the 
  vomerine 
  dentition, 
  which 
  

   measures 
  O04 
  in 
  maximum 
  width. 
  Teeth 
  of 
  median 
  series 
  about 
  

   twice 
  as 
  broad 
  as 
  long, 
  with 
  deeply 
  concave 
  posterior 
  margin 
  ; 
  teeth 
  

   of 
  the 
  two 
  lateral 
  series 
  nearly 
  equal 
  in 
  size, 
  slightly 
  elongated 
  

   transversely, 
  and 
  their 
  width 
  together 
  exceeding 
  that 
  of 
  the 
  median 
  

   series. 
  All 
  unworn 
  teeth 
  with 
  apical 
  indent, 
  slightly 
  crimped. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Cretaceous 
  : 
  Dorsetshire. 
  

  

  P. 
  3762. 
  Type 
  specimen, 
  shown 
  of 
  three-quarters 
  the 
  natural 
  

   size 
  in 
  the 
  accompanying 
  fig. 
  31 
  ; 
  Upper 
  Greensand, 
  

   Pinney 
  Bay, 
  near 
  Lyme 
  Eegis. 
  Enniskillen 
  Coll. 
  

  

  Coelodus 
  ellipticus, 
  Egerton. 
  

   1877. 
  Coelodus 
  ellipticus, 
  Sir 
  P. 
  Egerton, 
  Geol. 
  Mag. 
  [2] 
  vol. 
  iv. 
  p. 
  49, 
  

  

  pi. 
  iii. 
  fig. 
  1. 
  

   Type. 
  Eight 
  splenial 
  dentition 
  ; 
  British 
  Museum. 
  

   A 
  large 
  species 
  known 
  only 
  by 
  the 
  splenial 
  dentition. 
  Teeth 
  of 
  

  

  