﻿KENNAKD 
  : 
  ON 
  NEW 
  SPECIES 
  OF 
  VALVATA 
  AND 
  SPH^ERIUM. 
  325 
  

  

  Examples 
  of 
  this 
  species 
  were 
  submitted 
  to 
  the 
  late 
  Dr. 
  0. 
  Boettger 
  

   (whose 
  death 
  we 
  so 
  greatly 
  deplore) 
  and 
  were 
  pronounced 
  by 
  him 
  to 
  

   be 
  new 
  to 
  science. 
  There 
  can 
  be 
  but 
  little 
  doubt 
  that 
  this 
  is 
  the 
  

   Valvata 
  fluviatilis, 
  Colbeau, 
  of 
  F. 
  Sandberger 
  ("Ein 
  Beitrag 
  zur 
  

   Kenntniss 
  der 
  unterpleistocanen 
  Schichten 
  Englands": 
  Palseonto- 
  

   graphica, 
  1880, 
  p. 
  100, 
  Taf. 
  xii, 
  figs. 
  4-4^), 
  and 
  of 
  Clement 
  Eeid 
  

   (op. 
  cit., 
  pi. 
  V, 
  figs. 
  la-h). 
  V. 
  fluviatilis 
  is, 
  however, 
  only 
  a 
  form 
  

   of 
  piscinalis, 
  and 
  is 
  much 
  smaller 
  than 
  TFoodwardi, 
  besides 
  difi'ering 
  

   in 
  the 
  suture, 
  apex, 
  and 
  body-whorl. 
  The 
  nearest 
  living 
  ally 
  of 
  

   Woodwardi 
  is 
  V. 
  naticina, 
  Menke, 
  a 
  Central 
  European 
  species. 
  

  

  I 
  have 
  great 
  pleasure 
  in 
  associating 
  the 
  name 
  of 
  our 
  former 
  President 
  

   with 
  this 
  species 
  as 
  a 
  slight 
  recognition 
  of 
  his 
  valuable 
  services 
  to 
  

   Malacology. 
  

  

  SphjEritju: 
  Buileni, 
  n.sp. 
  

  

  Shell 
  ovate, 
  nearly 
  equilateral, 
  very 
  swollen, 
  with 
  front 
  margin 
  

   very 
  curved, 
  very 
  slightly 
  curved 
  ventrally, 
  anterior 
  and 
  posterior 
  

   margins 
  being 
  almost 
  equally 
  semicircular. 
  Exterior 
  showing 
  lines 
  

   of 
  increment 
  at 
  irregular 
  intervals. 
  TJmbones 
  nearly 
  central, 
  very 
  

   prominent, 
  tipped 
  with 
  the 
  embryonic 
  shell. 
  Length 
  9, 
  breadth 
  8, 
  

   thickness 
  7 
  mm. 
  The 
  embryonic 
  shell 
  measures 
  2 
  x 
  1*5 
  mm. 
  

  

  Teeth 
  : 
  Right 
  valve. 
  Hinge-plate 
  slightly 
  curved 
  either 
  side 
  of 
  

   cardinal 
  area. 
  This 
  curvature 
  is 
  greatly 
  accentuated 
  in 
  old 
  and 
  

   thickened 
  specimens 
  by 
  the 
  great 
  development 
  of 
  inner 
  lateral 
  teeth. 
  

   Cardinal 
  3 
  almost 
  semicircular, 
  3 
  b. 
  bifid, 
  and 
  about 
  twice 
  the 
  width 
  

   of 
  a. 
  ; 
  lateral 
  teeth 
  very 
  strong, 
  especially 
  inner 
  ones, 
  a.l. 
  1 
  stout 
  and 
  

   curved 
  towards 
  interior 
  of 
  shell, 
  apex 
  nearly 
  median, 
  the 
  cardinal 
  

   side 
  being 
  more 
  steeply 
  incurved 
  ; 
  a.l. 
  3 
  sliort 
  and 
  stout, 
  its 
  apex 
  the 
  

   same 
  distance 
  from 
  cardinal 
  as 
  a.l. 
  1 
  ; 
  p.l. 
  1 
  straighter 
  and 
  narrower 
  

   than 
  a.l. 
  1, 
  apical 
  point 
  less 
  pronounced, 
  and 
  vertical 
  ridge 
  curves 
  on 
  

   either 
  side 
  nearly 
  equal; 
  p.l. 
  3 
  nearly 
  as 
  long 
  as 
  p.l. 
  1, 
  its 
  apex 
  

   slightly 
  nearer 
  the 
  cardinal 
  than 
  that 
  of 
  p.l. 
  1, 
  the 
  cardinal 
  end 
  of 
  

   p.l. 
  3 
  considerably 
  swollen 
  and 
  thickened 
  as 
  it 
  approaches 
  the 
  ligament 
  

   pit, 
  which 
  is 
  long, 
  narrow, 
  and 
  moderately 
  deep. 
  

  

  