﻿^°1* 
  53-] 
  0F 
  THE 
  CHALK 
  rock. 
  393 
  

  

  Family 
  Pholadidai, 
  Leach. 
  

   Genus 
  Martesia, 
  Leach, 
  1824. 
  

   Martesia 
  ? 
  rotunda 
  (So 
  werby), 
  1850. 
  (PI. 
  XXVIII. 
  figs. 
  1 
  5-18.) 
  

  

  1850. 
  ? 
  Teredo 
  rotundus, 
  J. 
  de 
  C. 
  Sowerby 
  in 
  F. 
  Dixon's 
  ' 
  Geol. 
  Sussex,' 
  p. 
  346, 
  

   pi. 
  xxviii. 
  f. 
  27 
  & 
  28. 
  

  

  Description. 
  — 
  Umbonal 
  groove 
  well 
  marked, 
  only 
  a 
  little 
  oblique 
  ; 
  

   in 
  front 
  of 
  it 
  the 
  surface 
  is 
  ornamented 
  with 
  strong 
  radiating 
  ribs 
  

   crossed 
  by 
  finer 
  and 
  closer 
  concentric 
  ribs; 
  just 
  behind 
  the 
  groove 
  

   are 
  two 
  radiating 
  ribs 
  and 
  on 
  the 
  rest 
  of 
  the 
  shell 
  concentric 
  grooves 
  

   only 
  are 
  seen. 
  

  

  The 
  cast 
  of 
  the 
  interior 
  is 
  oval 
  in 
  form, 
  narrowing 
  posteriorly, 
  

   rounded 
  in 
  front 
  and 
  apparently 
  also 
  behind 
  ; 
  it 
  shows 
  that 
  the 
  

   large 
  anterior 
  gape 
  was 
  closed 
  by 
  a 
  callus 
  ; 
  behind 
  the 
  umbonal 
  

   groove 
  is 
  a 
  cast 
  of 
  a 
  ridge 
  or 
  process 
  extending 
  towards 
  the 
  posterior 
  

   margin. 
  Size 
  of 
  the 
  cast 
  : 
  length=7 
  mm. 
  ; 
  height=5*5 
  mm. 
  

  

  Remarks. 
  — 
  I 
  have 
  seen 
  only 
  one 
  specimen 
  of 
  this, 
  consisting 
  of 
  a 
  

   perfect 
  internal 
  cast 
  and 
  a 
  mould 
  of 
  a 
  portion 
  of 
  the 
  exterior 
  ; 
  it 
  is 
  

   not 
  sufficiently 
  perfect 
  to 
  enable 
  me 
  to 
  determine 
  the 
  genus 
  with 
  

   certainty 
  ; 
  but 
  I 
  think 
  that, 
  on 
  the 
  whole, 
  it 
  is 
  more 
  likely 
  to 
  be 
  

   Martesia 
  than 
  Pholadidea 
  . 
  Sowerby 
  figured, 
  under 
  the 
  name 
  of 
  

   Teredo 
  rotundus, 
  a 
  fragment 
  from 
  the 
  Chalk 
  of 
  Kent 
  showing 
  the 
  

   ornamentation, 
  and 
  also 
  a 
  cast 
  ; 
  from 
  the 
  former, 
  I 
  believe 
  it 
  is 
  

   probable 
  that 
  the 
  Chalk 
  Rock 
  specimen 
  belongs 
  to 
  the 
  same 
  species, 
  

   but 
  I 
  have 
  not 
  been 
  able 
  to 
  confirm 
  this 
  view 
  by 
  an 
  examination 
  of 
  

   the 
  type, 
  which 
  appears 
  to 
  have 
  been 
  lost. 
  

  

  Distribution. 
  — 
  Chalk 
  Rock 
  of 
  Cuckhamsley. 
  

  

  Family 
  Cuspidariidse, 
  Fischer. 
  

  

  Genus 
  Cuspidaria, 
  Xardo, 
  1840. 
  

   Cuspidaria 
  catjdata 
  (Nilsson), 
  1827. 
  (PI. 
  XXYITI. 
  figs. 
  19 
  & 
  20.) 
  

  

  1827. 
  Corbula 
  caudata, 
  S. 
  Nilssou, 
  ' 
  Petrif 
  . 
  Suecana,' 
  p. 
  18, 
  pi. 
  iii. 
  f. 
  18; 
  1837. 
  

   W. 
  Hisinger, 
  'Lethsea 
  Suecica,' 
  p. 
  66, 
  pi. 
  xix. 
  f. 
  12; 
  1840. 
  A. 
  Goldfuss, 
  'Petrel". 
  

   Germ.' 
  vol. 
  ii. 
  p. 
  251, 
  pi. 
  cli. 
  f. 
  17; 
  1846. 
  A. 
  E. 
  Reuss. 
  'Die 
  Verstein. 
  der 
  bohm. 
  

   Kreideformat.' 
  pt. 
  ii. 
  p. 
  20, 
  pi. 
  xxxvi. 
  f. 
  23; 
  1847. 
  R. 
  Kner, 
  'Verstein. 
  Kreidernerg. 
  

   von 
  Lemberg,' 
  Haidinger's 
  Naturwiss. 
  Abhandl. 
  vol. 
  iii. 
  pt\ 
  ii. 
  p. 
  25, 
  pi. 
  v. 
  f. 
  3; 
  

   1850. 
  H. 
  B. 
  Geinitz, 
  ' 
  Das 
  Quadersandsteingeb. 
  in 
  Deutschl.' 
  p. 
  150 
  ; 
  1850. 
  

   A. 
  d'Orbigny, 
  ' 
  Prodr. 
  de 
  Pal.' 
  vol. 
  ii. 
  p. 
  238; 
  1850 
  ?var., 
  A. 
  Alth, 
  'Geogn.-pal. 
  

   Beschreib. 
  der 
  nachst. 
  Umgeb. 
  v. 
  Lemberg,' 
  Haidinger's 
  Naturwiss. 
  Abbandl. 
  vol. 
  iii. 
  

   p. 
  237, 
  pi. 
  xii. 
  f. 
  22 
  ; 
  1863. 
  A. 
  v. 
  Strombeck, 
  Zeitscbr. 
  Deutsch. 
  geol. 
  Gesellsch. 
  vol. 
  xv. 
  

   p. 
  147; 
  1873. 
  H. 
  B. 
  Geinitz, 
  'Das 
  Elbthalgeb. 
  in 
  Sachsen,' 
  Palaeontographica, 
  

   vol. 
  xx. 
  pt. 
  ii. 
  p. 
  67, 
  pi. 
  xxiii. 
  f. 
  19; 
  1877 
  ?A. 
  Fritsch, 
  'Stud, 
  im 
  Gebiete 
  der 
  

   bohm. 
  Kreideformat. 
  II. 
  Die 
  Weissenberger 
  u. 
  Malnitzer 
  Schichten,' 
  p. 
  125, 
  f. 
  107 
  ; 
  

   1882. 
  H. 
  Schroder, 
  Zeitschr. 
  Deutsch. 
  geol. 
  Gesellsch. 
  vol. 
  xxxiv. 
  p. 
  275 
  ; 
  1889. 
  Fritsch, 
  

   ' 
  Stud, 
  im 
  Gebiete 
  der 
  bohm. 
  Kreideformat. 
  IV. 
  Die 
  Teplitzer 
  Schichten,' 
  p. 
  81 
  ; 
  

   1893. 
  Fritsch, 
  ibid. 
  'V. 
  Die 
  Priesener 
  Schichten,' 
  p. 
  96. 
  

  

  1839-53. 
  Necera 
  caudata, 
  G. 
  P. 
  Deshayes, 
  ' 
  Traite 
  Element, 
  de 
  Conchyliol.' 
  vol. 
  i. 
  

   p. 
  192 
  ; 
  1864. 
  F. 
  J. 
  Pictet 
  & 
  G. 
  Campiche, 
  ' 
  Foss. 
  du 
  Terr. 
  Cret. 
  des 
  Envir. 
  de 
  Ste. 
  

   Croix 
  ' 
  (Pal. 
  Suisse, 
  ser. 
  ix.), 
  p. 
  42 
  ; 
  1869. 
  E. 
  Favre, 
  ' 
  Moll. 
  Foss. 
  de 
  la 
  Craie 
  des 
  

   Envir. 
  de 
  Lemberg,' 
  p. 
  102, 
  pi. 
  xi. 
  f. 
  8 
  ; 
  1885. 
  F. 
  Notling, 
  'Die 
  Fauna 
  der 
  baltischen 
  

   Cenoman-Geschiebe,' 
  Palaont. 
  Abhandl. 
  vol. 
  ii. 
  p. 
  35, 
  pi. 
  vi. 
  f 
  . 
  7 
  ; 
  1889. 
  0. 
  Griepenkerl, 
  

   'Die 
  Verstein. 
  d. 
  Senon. 
  Kreide 
  v. 
  Konigslutter,' 
  Palaont. 
  Abhandl. 
  vol. 
  iv. 
  p. 
  69. 
  

  

  1850. 
  Leda 
  jpulchra, 
  J. 
  de 
  C. 
  Sowerby, 
  in 
  F. 
  Dixon's 
  'Geol. 
  Sussex,' 
  p. 
  346 
  

   (p. 
  382, 
  2nd 
  ed.), 
  pi. 
  xxviii. 
  f. 
  10; 
  1854. 
  Leda 
  ? 
  pulchra, 
  J. 
  Morris, 
  ' 
  Cat. 
  Brit. 
  Foss.' 
  

   2nd 
  ed. 
  p. 
  205. 
  

  

  

  