﻿358 
  

  

  F. 
  G. 
  H. 
  PB1CE 
  ON 
  THE 
  GATJLT 
  OF 
  FOLKESTONE. 
  

  

  in 
  his 
  Geology 
  of 
  Sussex, 
  pi. 
  xix. 
  f. 
  26, 
  27, 
  in 
  the 
  year 
  1822, 
  and 
  also 
  

   badly 
  figured 
  by 
  Phillips 
  in 
  his 
  ' 
  Yorkshire 
  ' 
  in 
  1829 
  ; 
  whereas 
  the 
  

   Nucula 
  ovata 
  erroneously 
  described 
  as 
  that 
  of 
  Mantell 
  in 
  the 
  Pal. 
  

   Franc,. 
  Cret. 
  t. 
  iii. 
  p. 
  173, 
  was 
  published 
  in 
  the 
  year 
  1843 
  by 
  

   D'Orbigny, 
  twenty-one 
  years 
  later 
  *. 
  

  

  Therefore, 
  following 
  the 
  rules 
  of 
  priority, 
  the 
  Nucula 
  ovata 
  of 
  

   Mantell, 
  figured 
  and 
  described 
  in 
  his 
  ' 
  Geology 
  of 
  Sussex,' 
  must 
  stand 
  

   good 
  as 
  a 
  species, 
  and 
  the 
  Nucula 
  ovata 
  of 
  D'Orbigny 
  must 
  receive 
  

   a 
  new 
  specific 
  name, 
  as, 
  in 
  my 
  conviction, 
  he 
  made 
  an 
  error 
  in 
  con- 
  

   sidering 
  it 
  to 
  be 
  identical 
  with 
  that 
  of 
  Mantell. 
  

  

  Below 
  I 
  give 
  a 
  description 
  of 
  this 
  larger 
  form 
  of 
  Nucula, 
  which 
  I 
  

   propose 
  to 
  name 
  Nucula 
  DeRancei. 
  

  

  Nucula 
  DeRancei, 
  F. 
  G. 
  H. 
  Price. 
  (PI. 
  XXY. 
  fig. 
  7.) 
  

  

  Shell 
  ovate, 
  inequilateral, 
  inflated, 
  thick, 
  nacreous, 
  ornamented 
  

   with 
  delicate 
  concentric 
  striae 
  ; 
  ventral 
  portion 
  furnished 
  with 
  more 
  

   or 
  less 
  concentric 
  laminae. 
  Anterior 
  portion 
  of 
  dorsal 
  margin 
  short 
  

   and 
  angular 
  ; 
  posterior 
  long, 
  sloping 
  from 
  umbones 
  to 
  posterior 
  

   margin. 
  Lunule 
  indistinct 
  ; 
  lip 
  of 
  ventral 
  margin 
  very 
  thick 
  ; 
  mus- 
  

   cular 
  impressions 
  well-marked 
  and 
  callous. 
  

  

  millims. 
  

  

  Length 
  of 
  shell 
  , 
  . 
  . 
  . 
  . 
  31 
  

  

  Height 
  of 
  shell 
  20 
  

  

  This 
  well-marked 
  shell, 
  differing 
  from 
  all 
  other 
  Nuculm 
  in 
  form 
  

   and 
  size, 
  is 
  only 
  met 
  with 
  in 
  the 
  lower 
  part 
  of 
  bed 
  II., 
  not 
  even 
  

   extending 
  into 
  the 
  horizon 
  of 
  Ajporrhais 
  calcarata. 
  

  

  Table 
  of 
  Species 
  of 
  Oault 
  Fossils 
  from 
  Folkestone. 
  

  

  Genera 
  and 
  Species. 
  

  

  Plant 
  je. 
  

   Pinites 
  hexagonus, 
  Carruthers 
  

  

  Amorphozoa. 
  

  

  Hylospongia, 
  Sollas 
  

  

  Pyriform 
  sponges 
  

  

  Zoophyta. 
  

   Bathycyathus 
  Sowerbyi, 
  Edw, 
  

  

  $ 
  H. 
  

  

  Cyclocyathus 
  Fittoni, 
  M.-Edw, 
  

   Smilotrochus 
  e\onga.tus,Duncan 
  

  

  insignis, 
  Duncan 
  

  

  Trochosmilia 
  sulcata, 
  Edw. 
  SfH. 
  

   Trochocyathus 
  conulus, 
  Edw. 
  

  

  &H. 
  

  

  Harveyanus 
  (var. 
  of), 
  

  

  M.-Edw 
  

  

  Lower 
  Gault. 
  

  

  II. 
  III. 
  IV. 
  V. 
  VI. 
  VII. 
  

  

  Upper 
  

   Gault. 
  

  

  VIII 
  IX. 
  X. 
  XI 
  

  

  * 
  There 
  is 
  a 
  very 
  fair 
  figure 
  of 
  Nucula 
  ovata, 
  Mant., 
  in 
  the 
  'Tabular 
  view 
  of 
  

   characteristic 
  British 
  Fossils.' 
  

  

  