﻿BIHANG 
  TllL 
  K. 
  SV. 
  VET.-AKAD. 
  HANDL. 
  BAND 
  6. 
  N:0 
  21. 
  29 
  

  

  JV. 
  latissima 
  Greg. 
  

   Travemiinde. 
  

  

  N. 
  humerosa 
  Bréb. 
  

  

  VH. 
  D. 
  B. 
  Pl. 
  XI, 
  fig. 
  20. 
  

  

  Sölvesborg, 
  Gotl. 
  : 
  Ostergarn, 
  Harbour 
  of 
  Pillau 
  (Schum. 
  

   1867). 
  

  

  v.? 
  fuscata 
  Schum. 
  

  

  F. 
  Habirshaw 
  in 
  his 
  catalogue 
  refers 
  Schumanns 
  species 
  

   to 
  N. 
  humerosa 
  Bréb., 
  with 
  which 
  it 
  seems 
  to 
  have 
  very 
  

   little 
  resemblancc. 
  The 
  striae 
  are 
  much 
  denser 
  and 
  not 
  al- 
  

   ternately 
  shortened 
  as 
  in 
  N. 
  humerosa. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  iV. 
  marina 
  Ralfs. 
  

  

  VH. 
  D. 
  B. 
  Pl. 
  XI, 
  f. 
  16. 
  

  

  Travemiinde, 
  Pillau 
  (Schum. 
  1867), 
  Gotland: 
  Klintehamn, 
  

   Södermanland: 
  Häringe, 
  Helsingfors. 
  

  

  A^. 
  sphcerophora 
  K. 
  

   VH. 
  D. 
  B. 
  Ph 
  XII, 
  f. 
  2. 
  

  

  Ringkjöbing 
  (Schm. 
  Atl. 
  Pl. 
  49), 
  Södertelje 
  (Schm. 
  1. 
  cit.). 
  

   Subfoss.: 
  Upland: 
  in 
  silt 
  from 
  peatmosses; 
  in 
  shell 
  bed 
  

   of 
  Hellsbo 
  kärr 
  in 
  Södermanland. 
  

  

  N. 
  sculpta 
  E. 
  

  

  Schm. 
  Atl. 
  Pl. 
  49, 
  fig. 
  and 
  

  

  /V. 
  bohemica 
  E, 
  

  

  Schm. 
  Atl. 
  Pl. 
  49, 
  fig. 
  

   seem 
  to 
  be 
  very 
  slightly 
  distinct 
  from 
  one 
  another 
  and 
  ought 
  

   to 
  be 
  united 
  as 
  one 
  species. 
  Both 
  in 
  respect 
  of 
  the 
  outline 
  

   of 
  the 
  valve 
  and 
  of 
  the 
  symmetry 
  and 
  extent 
  of 
  the 
  vm- 
  

   striated 
  area 
  they 
  pass 
  gradually 
  in 
  one 
  another. 
  

  

  Not 
  common. 
  Generally 
  in 
  almost 
  fresh 
  water. 
  Gotland 
  : 
  

   Bogevik 
  (Cl.), 
  Södermanland: 
  Häringe, 
  Södertelje 
  (Cl.), 
  Up- 
  

   land: 
  Rådmansö. 
  

  

  Subfoss.: 
  Upland: 
  in 
  silt 
  from 
  peatmosses. 
  

  

  N. 
  cuspidata 
  K. 
  

  

  Sm. 
  Syn. 
  Pl. 
  XVI, 
  fig. 
  131. 
  VH. 
  D. 
  B. 
  Pl. 
  XH, 
  f. 
  4. 
  

   In 
  brackish 
  and 
  almost 
  fresh 
  water: 
  Malmö, 
  Karlshamn, 
  

   Rostock, 
  Södertelje, 
  (Cl.) 
  Upland: 
  Blidö. 
  

  

  N. 
  Smithii 
  Bréb. 
  

   Schm. 
  Atl. 
  Pl. 
  7. 
  

  

  