﻿392 
  ME. 
  H. 
  WOODS 
  ON 
  THE 
  MOLLTJSCA 
  [Aug. 
  1 
  89 
  7, 
  

  

  Affinities. 
  — 
  The 
  shell 
  in 
  Cypricardia 
  galiciana, 
  E. 
  Favre 
  * 
  (from 
  

   near 
  Lemberg), 
  is 
  relatively 
  snorter, 
  more 
  ovoid, 
  and 
  the 
  umbones 
  

   less 
  recurved. 
  Crassatella 
  tricarinata, 
  Eomer, 
  2 
  is 
  also 
  more 
  ovoid 
  

   than 
  trapezoidalis, 
  and 
  the 
  umbones 
  are 
  less 
  anterior 
  in 
  position. 
  

  

  Distribution. 
  — 
  England: 
  Chalk 
  liock 
  of 
  Cuckhamsley, 
  Princes 
  

   Risborough, 
  Thickthorn 
  Hill 
  (Bledlow), 
  and 
  Luton 
  cutting. 
  Ireland 
  : 
  

   White 
  Limestone. 
  Saxony 
  : 
  Cenomanian 
  of 
  Plauen 
  {fide 
  Geinitz) 
  ; 
  

   Planer-Kalk 
  of 
  Strehlen 
  {fide 
  Eomer). 
  Bavaria 
  : 
  Kagerhoh 
  Beds 
  

   of 
  Kagerhoh. 
  

  

  Tkapezitjm 
  rectangtjlare, 
  sp. 
  nov. 
  (PI. 
  XXVIII. 
  figs. 
  11 
  & 
  12.) 
  

  

  Description. 
  — 
  Shell 
  oblong, 
  moderately 
  convex, 
  anteriorly 
  short 
  

   and 
  rounded, 
  posteriorly 
  elongate. 
  Hinge-margin 
  and 
  the 
  ventral 
  

   margin 
  nearly 
  straight 
  and 
  parallel. 
  Posterior 
  margin 
  nearly 
  

   straight, 
  and 
  almost 
  at 
  right 
  angles 
  to 
  the 
  hinge-margin. 
  Umbones 
  

   not 
  prominent. 
  Carina 
  obtuse, 
  extending 
  in 
  a 
  curve 
  from 
  the 
  

   umbo 
  to 
  the 
  posterior 
  angle, 
  and 
  cuttiDg 
  off 
  a 
  triangular 
  and 
  

   slightly 
  convex 
  area. 
  In 
  the 
  interior 
  a 
  septum 
  extends 
  from 
  the 
  

   umbo 
  towards 
  the 
  anterior-ventral 
  margin. 
  Size 
  of 
  a 
  specimen 
  : 
  

   length 
  = 
  19 
  mm. 
  ; 
  height 
  = 
  11 
  mm. 
  

  

  Affinities. 
  — 
  The 
  shell 
  in 
  this 
  species 
  is 
  flatter 
  than 
  in 
  T. 
  trajpe- 
  

   zoidale, 
  the 
  umbones 
  are 
  less 
  prominent, 
  and 
  the 
  posterior 
  margin 
  

   forms 
  a 
  right 
  angle 
  with 
  the 
  hinge-margin. 
  It 
  differs 
  from 
  

   T. 
  parallelum, 
  Alth, 
  3 
  in 
  being 
  relatively 
  shorter, 
  in 
  the 
  anterior 
  part 
  

   being 
  very 
  short, 
  and 
  in 
  the 
  ventral 
  margin 
  being 
  nearly 
  straight. 
  

  

  Distribution. 
  — 
  I 
  have 
  seen 
  only 
  four 
  examples 
  of 
  this 
  species, 
  all 
  

   of 
  which 
  come 
  from 
  Cuckhamsley, 
  and 
  are 
  in 
  the 
  Montagu 
  Smith 
  

   Collection. 
  A 
  small 
  piece 
  of 
  shell 
  is 
  preserved 
  on 
  one 
  specimen, 
  

   and 
  is 
  almost 
  smooth. 
  

  

  Paniily 
  Lucinidse, 
  Deshayes. 
  

   Genus 
  Corbis, 
  Cuvier, 
  1817. 
  

   Cordis? 
  Morisoni, 
  sp. 
  nov. 
  (PI. 
  XXVIII. 
  figs. 
  13 
  & 
  14.) 
  

  

  Description. 
  — 
  Shell 
  much 
  inflated, 
  rounded, 
  inequilateral, 
  slightly 
  

   longer 
  tnan 
  wide. 
  Umbones 
  moderately 
  prominent, 
  close 
  together, 
  

   curved 
  anteriorly. 
  Surface 
  with 
  well-marked 
  lines 
  of 
  growth. 
  

   Hinge 
  unknown. 
  Size 
  of 
  a 
  specimen: 
  length 
  = 
  14 
  mm. 
  ; 
  height 
  

   = 
  13 
  mm. 
  

  

  HemarTcs. 
  — 
  I 
  have 
  seen 
  only 
  two 
  specimens 
  of 
  this 
  species; 
  one 
  

   is 
  a 
  cast 
  of 
  the 
  left 
  valve, 
  the 
  other 
  is 
  a 
  right 
  valve 
  with 
  a 
  portion 
  

   of 
  the 
  shell 
  preserved. 
  With 
  this 
  limited 
  material 
  at 
  my 
  disposal 
  

   it 
  is 
  impossible 
  to 
  give 
  a 
  full 
  description 
  of 
  the 
  characters 
  of 
  this 
  

   species. 
  

  

  Distribution. 
  — 
  Chalk 
  Bock 
  of 
  Cuckhamsley. 
  

  

  1 
  ' 
  Descr. 
  Moll. 
  Foss. 
  de 
  la 
  Craie 
  des 
  Envir. 
  de 
  Lemberg 
  en 
  Galicie,' 
  1869, 
  

   p. 
  109 
  & 
  pi. 
  xii. 
  f 
  . 
  3. 
  

  

  2 
  'Die 
  Verstein. 
  des 
  norddeutsch. 
  Kreidegeb.' 
  (1841) 
  p. 
  74 
  & 
  pi. 
  ix. 
  f. 
  23. 
  

  

  3 
  'Geogn.-pal. 
  Beschreib. 
  der 
  nachst. 
  Uuigeb. 
  v. 
  Lemberg,' 
  Haidinger's 
  

   Naturwiss. 
  Abhandl. 
  vol. 
  iii. 
  pt. 
  ii. 
  (1850) 
  p. 
  229 
  & 
  pi. 
  xii. 
  f. 
  8. 
  

  

  