﻿384 
  MR. 
  H. 
  WOODS 
  ON 
  THE 
  MOLLUSCA 
  [Aug. 
  1897, 
  

  

  1850. 
  Lima 
  Sowerbyi, 
  H. 
  B. 
  Geinitz, 
  'Das 
  Quadersandst. 
  oder 
  Kreidegeb. 
  in 
  

   Deutschland,' 
  p. 
  192; 
  1851. 
  J. 
  Miiller, 
  'Mod. 
  der 
  Petrefact. 
  der 
  Aachener 
  Kreide- 
  

   format.' 
  pt. 
  ii. 
  p. 
  67 
  ; 
  1851-52. 
  H. 
  G. 
  Bronn, 
  'Lethaea 
  Geogn.' 
  3rd 
  ed. 
  vol. 
  ii. 
  p. 
  278, 
  

   pi. 
  xxxii. 
  f 
  . 
  8 
  ; 
  1870. 
  P. 
  J. 
  Pictet 
  & 
  G. 
  Campiche, 
  ' 
  Foss. 
  du 
  Terr. 
  Cret. 
  de 
  Ste. 
  Croix,' 
  

   ser. 
  5, 
  pt. 
  iv., 
  Mater. 
  Paleont. 
  Suisse, 
  p. 
  173 
  ; 
  1872. 
  H. 
  B. 
  Geinitz, 
  'Das 
  Elbtbalgeb. 
  

   in 
  Sachsen,' 
  Palaeontographica, 
  vol. 
  xx. 
  pt. 
  ii. 
  p. 
  41, 
  pi. 
  ix. 
  f. 
  13 
  & 
  14 
  ; 
  1883. 
  A. 
  Fritsch, 
  

   ' 
  Stud, 
  im 
  Gebiete 
  der 
  bohm. 
  Kreideformat. 
  III. 
  Die 
  Iserscbichten,' 
  p. 
  115, 
  f. 
  87. 
  

  

  1841. 
  Lima 
  Nilssoni, 
  F. 
  A. 
  Bonier 
  ' 
  Die 
  Verstein. 
  des 
  norddeutscb. 
  Kreidegeb.' 
  

   p. 
  57. 
  

  

  1842. 
  Lima 
  Goldfussi, 
  F. 
  v. 
  Hagenow, 
  Leonbard's 
  Neues 
  Jahrb. 
  p. 
  555. 
  

  

  1892. 
  Lima 
  {Plagiostoma) 
  Hoperi, 
  E. 
  Stolley, 
  "' 
  Die 
  Kreide 
  Scbleswig-Holsteins,' 
  

   Mitth. 
  aus 
  dem 
  Min. 
  Inst. 
  Univ. 
  Kiel, 
  vol. 
  i. 
  p. 
  237 
  ; 
  1888. 
  O. 
  Griepenkerl, 
  ' 
  Die 
  

   Verstein. 
  der 
  Senon. 
  Kreide 
  von 
  Konigslutter,' 
  Palaont. 
  Abhandl. 
  vol. 
  iv. 
  p. 
  40. 
  

  

  Remarks. 
  — 
  The 
  ornamentation 
  varies 
  considerably 
  in 
  this 
  species. 
  

   In 
  some 
  examples 
  the 
  shell 
  is 
  almost 
  smooth, 
  except 
  near 
  the 
  anterior 
  

   and 
  posterior 
  margins 
  ; 
  in 
  others 
  the 
  whole 
  surface 
  is 
  marked 
  with 
  

   pitted 
  grooves, 
  which, 
  however, 
  are 
  usually 
  less 
  distinct 
  near 
  the 
  

   centre 
  than 
  on 
  the 
  anterior 
  and 
  posterior 
  parts 
  of 
  the 
  shell. 
  There 
  

   is 
  every 
  gradation 
  between 
  these 
  two 
  extremes 
  ; 
  in 
  some 
  cases 
  the 
  

   differences 
  are 
  due 
  to 
  imperfect 
  preservation. 
  Some 
  specimens 
  

   show 
  the 
  ornamentation 
  near 
  the 
  umbo, 
  but 
  not 
  on 
  the 
  rest 
  of 
  the 
  

   shell. 
  

  

  Geinitz 
  considers 
  that 
  Sowerby's 
  L. 
  Hoperi 
  is 
  distinct 
  from 
  

   Mantell's 
  ; 
  the 
  former 
  (which 
  he 
  names 
  L. 
  Soiuerbyi) 
  is 
  for 
  the 
  

   most 
  part 
  smooth 
  ; 
  the 
  latter 
  possesses 
  grooves 
  over 
  the 
  whole 
  

   surface. 
  These 
  differences, 
  as 
  I 
  have 
  pointed 
  out 
  above, 
  are 
  not 
  of 
  

   specific 
  value 
  ; 
  there 
  can 
  be 
  no 
  doubt 
  whatever 
  that 
  Mantell's 
  

   fig. 
  2 
  is 
  the 
  same 
  species 
  as 
  Sowerby's, 
  and 
  moreover 
  Sowerby 
  

   received 
  his 
  specimens 
  from 
  Mantell. 
  The 
  examples 
  figured 
  by 
  

   both 
  authors 
  came 
  from 
  Lewes 
  : 
  Sowerby's 
  specimens 
  are 
  in 
  the 
  

   British 
  Museum, 
  but 
  I 
  have 
  not 
  seen 
  Mantell's. 
  

  

  The 
  species 
  described 
  by 
  Brongniart 
  as 
  Plagiostoma 
  Mantelli 
  

   was 
  considered 
  by 
  Mantell 
  l 
  to 
  be 
  identical 
  with 
  L. 
  Hoperi. 
  

  

  Different 
  specimens 
  of 
  L. 
  Hoperi 
  show 
  a 
  considerable 
  amount 
  of 
  

   variation 
  in 
  the 
  relative 
  proportions 
  of 
  the 
  length 
  and 
  height, 
  some 
  

   being 
  higher 
  than 
  long, 
  others 
  longer 
  than 
  high. 
  

  

  Distribution. 
  — 
  England 
  : 
  Chalk 
  Rock 
  and 
  Upper 
  Chalk 
  — 
  not 
  

   common 
  in 
  the 
  former. 
  Chalk 
  Hock 
  of 
  Luton 
  cutting, 
  Westley 
  

   Waterless, 
  and 
  Underwood 
  Hall 
  near 
  Dullingham. 
  Ireland: 
  White 
  

   Limestone. 
  France 
  : 
  zone 
  of 
  Micraster 
  breviporus 
  at 
  Cambrai 
  ; 
  

   zone 
  of 
  Epiaster 
  brevis 
  at 
  St. 
  Clement 
  and 
  Guise 
  ; 
  zone 
  of 
  M. 
  cor- 
  

   anguinum 
  at 
  Banogne 
  and 
  Lezennes. 
  Belgium 
  : 
  Senonian 
  of 
  

   Limbourg. 
  Aachen 
  : 
  Mucronata-heds 
  of 
  Yaals 
  and 
  Henry-Chapelle. 
  

   Westphalia 
  : 
  Senonian 
  of 
  Ccesfeld 
  ; 
  Mucrona 
  ta-beds 
  of 
  Haldem, 
  

   etc. 
  ; 
  Quadrata-be&s 
  of 
  Ilsenburg 
  ; 
  JScaphites-beds 
  of 
  Quedlinburg 
  ; 
  

   and 
  Inoceramus 
  Brongniarti-VYixiQY. 
  Brunswick 
  : 
  Upper 
  Senonian 
  

   of 
  Konigslutter. 
  Saxony 
  : 
  Pliiner-Kalk 
  of 
  Strehlen 
  and 
  Weinbohla. 
  

   Silesia 
  : 
  Scaphites-\)eds 
  of 
  Oppeln. 
  Schleswig-Holstein 
  : 
  Quadrata- 
  

   beds 
  of 
  Lagerdorf. 
  Bohemia: 
  Weissenberg, 
  Malnitz, 
  Teplitz, 
  and 
  

   Priesen 
  Beds. 
  Bavaria 
  : 
  Grossberg 
  Beds. 
  Galicia 
  : 
  Chalk 
  of 
  

   Nagorzany 
  (Lemberg). 
  Scania 
  : 
  Mammillatus-zone 
  of 
  Ignaberga, 
  

  

  etc. 
  

  

  1 
  Trans. 
  Geol. 
  Soc. 
  ser. 
  2, 
  vol. 
  iii. 
  (1835) 
  p. 
  206. 
  

  

  