﻿30 
  JUHLIN-DANNFELT, 
  ON 
  THE 
  DIATOMS 
  OF 
  THE 
  BALTIC 
  SEA. 
  

  

  Common 
  but 
  generally 
  only 
  as 
  single 
  specimens, 
  never 
  

   in 
  greater 
  masses. 
  On 
  the 
  open 
  coast 
  and 
  floating 
  on 
  the 
  

   surface 
  of 
  the 
  sea. 
  Very 
  common 
  in 
  bottom-mud. 
  

  

  Siibfoss.: 
  Dalarö 
  bathing 
  silt. 
  

  

  var. 
  Icevis 
  no 
  v. 
  var. 
  Plate 
  II, 
  fig. 
  15. 
  

   Striae 
  unpiinctate. 
  Else 
  as 
  the 
  main 
  species, 
  varies 
  as 
  

   this 
  in 
  outline 
  and 
  in 
  the 
  form 
  of 
  the 
  longitudinal 
  lines. 
  

   With 
  the 
  main 
  species, 
  less 
  common. 
  

  

  N. 
  eliptica 
  K. 
  

  

  N. 
  Parmula 
  Bkéb. 
  in 
  Schum. 
  1867. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867), 
  Gotland: 
  Klintehamn. 
  

  

  N. 
  didyma 
  K. 
  

   DoNK. 
  Brit. 
  Diat. 
  

  

  Occurs 
  as 
  N. 
  Smithii. 
  Travemlmde 
  (Ostsee 
  Exp. 
  1871, 
  p. 
  

   177), 
  Gotland: 
  Ostergarn 
  (Cl.), 
  Slite 
  (Cl.), 
  Kalmar, 
  Sölvesborg. 
  

  

  N. 
  Bomhus 
  (Greg.) 
  Donk. 
  

   DoNK. 
  B. 
  D. 
  pag. 
  50, 
  Pl. 
  VII, 
  fig. 
  7. 
  

   N. 
  gemina 
  A. 
  Schm. 
  Atl. 
  Pl. 
  XIII. 
  

  

  Very 
  rare: 
  At 
  Kalmar 
  I 
  found 
  a 
  very 
  small 
  form, 
  quite 
  

   Tesembling 
  the 
  fig. 
  7 
  in 
  Schm. 
  Atl. 
  Pl. 
  XIII. 
  

  

  N. 
  Apis 
  (E.) 
  Donk. 
  

  

  Donk. 
  Brit. 
  Diat. 
  

  

  Very 
  rare: 
  Travemlmde. 
  

  

  N. 
  Crahro 
  K. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  N. 
  interrupta 
  (K.) 
  Donk. 
  

  

  Scarce 
  in 
  all 
  parts 
  of 
  the 
  Baltic: 
  Gotl. 
  : 
  Ostergarn 
  (Cl.), 
  

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

   Subfoss.: 
  in 
  silty 
  clay 
  from 
  Rådmansö, 
  Upland. 
  

  

  A^. 
  hyalina 
  Donk. 
  

  

  Donk. 
  Brit. 
  Diat. 
  p. 
  5, 
  Pl. 
  I, 
  f. 
  1. 
  

  

  Not 
  rare. 
  On 
  open 
  coasts: 
  Oland: 
  Mörbylånga, 
  Vester- 
  

   vik, 
  Helsingfors. 
  In 
  bays 
  with 
  almost 
  fresh 
  water: 
  Norrtelje, 
  

   Helsingfors 
  (Thölö). 
  

  

  N. 
  Pupida 
  (K.) 
  Geun. 
  

  

  Gotland 
  (Cl. 
  & 
  Moll. 
  Diat. 
  N:o 
  86). 
  

  

  v. 
  hacillarioides 
  Geun. 
  

   Aret. 
  Diat. 
  p. 
  45. 
  

  

  