﻿BIHAXG 
  TILL 
  K. 
  SV. 
  VET.-AKAD. 
  HANDL. 
  BAND 
  6. 
  N:0 
  21. 
  25 
  

  

  JV. 
  digitoradiata 
  Greg. 
  

   Aret. 
  Diat. 
  p. 
  32. 
  

  

  Somewhat 
  rare: 
  Malmö, 
  Sölvesborg, 
  Travemllude, 
  Got- 
  

   land: 
  Bogevik 
  (Cl.), 
  Upland. 
  

  

  Subfoss.: 
  In 
  silty 
  clay 
  from 
  eastern 
  Upland. 
  

  

  N. 
  cyprinus 
  (Sm.) 
  Geun. 
  

   Vaxholm 
  (Cl.). 
  

  

  N. 
  bothnica 
  Geun. 
  

   Aret. 
  Diat. 
  p. 
  32. 
  

  

  o 
  

  

  Ångermanland: 
  Näske 
  (Cl.), 
  Hernösand 
  (Cl. 
  & 
  Moll. 
  

   Diat. 
  N:o 
  237), 
  Eathan 
  (Cl.), 
  Haparanda 
  (Cl.), 
  Helsingfors, 
  

   Karlshamn. 
  

  

  Subfoss.: 
  Upland: 
  in 
  recent 
  silt 
  from 
  Rådmansö. 
  

  

  N. 
  Placentula 
  Ehb. 
  var. 
  suhsalsa 
  Geun. 
  

   Aret. 
  Diat. 
  p. 
  34; 
  VH. 
  D. 
  B. 
  Pl. 
  VHI, 
  f. 
  31. 
  

   Rare: 
  Helsingfors 
  (little 
  form 
  with 
  17 
  striae 
  in 
  0,01 
  mm.), 
  

   Gotland: 
  Klintehamn. 
  

  

  N. 
  peregrina 
  KtJTZ. 
  

  

  VH. 
  D. 
  B. 
  Pl. 
  VH, 
  fig. 
  2. 
  

  

  Common 
  in 
  all 
  parts 
  of 
  the 
  Baltic: 
  Rathan 
  (Cl.), 
  Abo, 
  

   Helsingfors, 
  Roslagen, 
  Vaxholm, 
  Gotland: 
  Ostergarn 
  (Cl.) 
  and 
  

   Klintehamn, 
  Karlshamn, 
  Sölvesborg, 
  Kiel 
  (Schm. 
  Atl. 
  Pl. 
  47). 
  

  

  var. 
  Meniscus 
  Schum. 
  

  

  According 
  to 
  Geunow 
  — 
  Aret. 
  Diat. 
  p. 
  33 
  — 
  it 
  is 
  com- 
  

   mon 
  in 
  the 
  Baltic. 
  I 
  found 
  it 
  only 
  at 
  Helsingfors 
  in 
  almost 
  

   fresh 
  water. 
  

  

  N. 
  Meniscidus 
  Schum. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  N. 
  rhynchocephala 
  KtiTZ. 
  

  

  Aret. 
  Diat. 
  p. 
  33. 
  

  

  Not 
  rare. 
  On 
  the 
  open 
  eoast 
  and 
  in 
  bays. 
  Rathan 
  (Cl.), 
  

   Upland, 
  Helsingfors, 
  Södermanland: 
  Häringe, 
  Dalarö, 
  Got- 
  

   land: 
  Ostergarn, 
  Klintehamn, 
  

  

  Subfoss.: 
  Bathing 
  slick 
  from 
  Norrtelje, 
  silt 
  in 
  the 
  peat- 
  

   •mosses 
  of 
  Roslagen. 
  

  

  v. 
  a7nphiceros 
  KtJTZ. 
  

  

  Aret. 
  Diat. 
  p. 
  33. 
  

  

  Schm. 
  Atl. 
  Pl. 
  XLVII, 
  f. 
  25. 
  

  

  