﻿BIHANG 
  TILL 
  K. 
  SV. 
  VET.-AKAD. 
  HANDL. 
  BAND 
  6. 
  N:0 
  21. 
  11 
  

  

  mon 
  OB 
  similar 
  localities 
  are 
  also 
  Epitliemia 
  turgida 
  Ehb., 
  

   E. 
  sorex 
  K., 
  E. 
  gibba 
  Ehb. 
  and 
  Roicosphenia 
  curvata 
  Geun. 
  

   which 
  also 
  occur 
  in 
  fresli 
  water, 
  wliere 
  still 
  I 
  never 
  found 
  

   them 
  in 
  so 
  enormous 
  masses 
  as 
  in 
  tlie 
  Baltic. 
  Soraewhat 
  

   less 
  common 
  are: 
  Mastogloia 
  Dausei 
  v. 
  eliptica 
  C. 
  Ag., 
  Navicula 
  

   peregrina 
  K. 
  and 
  N. 
  Smithii 
  Beéb., 
  Nitzschia 
  Sigma 
  K., 
  N. 
  

   punctata 
  Gkun. 
  and 
  N. 
  obtusa 
  Sm., 
  Melosira 
  nummiiloides 
  

   DiLLW. 
  and 
  Grammatophora 
  oceanica 
  E. 
  

  

  But 
  also 
  real 
  fresh 
  water 
  species 
  occur 
  commonly 
  on 
  the 
  

   open 
  coast; 
  sucli 
  are 
  Cymbella 
  Cistula 
  Hempe., 
  Amphora 
  

   ovalis 
  K., 
  Encyonema 
  caespitosum 
  K., 
  Cocconeis 
  Placentula 
  

   E., 
  Cymatopleura 
  Solea 
  E. 
  (less 
  common), 
  Surirella 
  ovata 
  K., 
  

   Staurosira 
  mutabilis 
  Sm., 
  Cyclotella 
  Meneghiniana 
  K., 
  Navicula 
  

   oblonga 
  K., 
  N. 
  rhyncliocephala 
  K. 
  and 
  N. 
  viridula 
  K. 
  

  

  The 
  fresh 
  water 
  flora 
  of 
  course 
  increases 
  very 
  much 
  in 
  

   quantity 
  and 
  number 
  of 
  species 
  in 
  deep 
  bays 
  such 
  as 
  the 
  

   Värtan 
  near 
  Stockholm, 
  the 
  Norrteljebay, 
  the 
  Bråviken 
  a. 
  o. 
  

   and 
  in 
  such 
  localities 
  where 
  nunierous 
  islets 
  protect 
  the 
  coast 
  

   against 
  the 
  open 
  sea. 
  In 
  those 
  localities 
  such 
  decided 
  fresh 
  

   water 
  species 
  are 
  found, 
  as 
  Cymbella 
  lanceolata 
  Ehb., 
  C. 
  ga- 
  

   stroides 
  K., 
  Goraphonema 
  constrictum 
  Ehb., 
  G. 
  acuminatum 
  

   Ehb., 
  g. 
  montanum 
  Schum., 
  G. 
  dichotomum 
  Sm., 
  G. 
  tenellum 
  

   K., 
  Navicula 
  hungarica 
  GrujSI., 
  N. 
  radiosa 
  K., 
  N. 
  limosa 
  K., 
  

   Surirella 
  angusta 
  K., 
  Melosira 
  varians 
  Sm., 
  and 
  many 
  others. 
  

   Moreover 
  in 
  the 
  same 
  localities 
  I 
  have 
  found 
  a 
  number 
  of 
  real 
  

   marine 
  species, 
  such 
  as 
  Amphora 
  sulcata 
  Greg., 
  A. 
  laevis 
  Gkeg., 
  

   A. 
  cymbifera 
  Geeg., 
  A. 
  granulata 
  Geeg., 
  Navicula 
  hyalina 
  DoNK., 
  

   N. 
  digitoradiata 
  Geeg., 
  Chsetoceros 
  Wighami 
  Btw., 
  Pleurosigma 
  

   Fasciola 
  Sm., 
  Berkeleya 
  Dillwynii 
  Ag., 
  and 
  sorae 
  species 
  of 
  the 
  

   genera 
  Schizonema 
  and 
  Homoeocladia. 
  These 
  species 
  generally 
  

   occur 
  on 
  the 
  open 
  coast 
  but 
  some 
  of 
  them 
  do 
  not 
  seem 
  to 
  

   be 
  very 
  sensible 
  to 
  fresh 
  water. 
  I 
  have 
  already 
  stated 
  that 
  

   some 
  of 
  them 
  occur 
  in 
  the 
  shallow 
  freshwater 
  bays, 
  above 
  

   raentioned, 
  but 
  I 
  have 
  also, 
  for 
  instance, 
  found, 
  at 
  Norrtelje 
  in 
  

   almost 
  fresh 
  water, 
  such 
  marine 
  species 
  as 
  Navicula 
  hyalina 
  

   DoNK., 
  Hyalodiscus 
  scoticus 
  K. 
  a. 
  o. 
  living 
  together 
  with 
  

   the 
  decided 
  fresh 
  water 
  species 
  Melosira 
  varians 
  Sm., 
  M. 
  

   punctata 
  Sm., 
  Gomphonema 
  acuminatum 
  and 
  constrictum 
  Ehb. 
  

   This 
  is 
  in 
  direct 
  opposition 
  to 
  the 
  observation 
  of 
  Lageestedt 
  

   in 
  his 
  paper 
  on 
  marine 
  diatomaceae 
  from 
  Bohuslän, 
  p. 
  8, 
  

   where 
  he 
  says 
  that 
  the 
  depth 
  has 
  very 
  little, 
  the 
  saltness 
  

  

  