﻿44 
  JUHLIN-DANNFELT, 
  ON 
  THE 
  DIATOMS 
  OF 
  THE 
  BALTIC 
  SEA. 
  

  

  Oiclo 
  II. 
  Placochromaticae. 
  

  

  Fam. 
  Fragilarieae. 
  

  

  Fragilaria 
  Lgb. 
  

   Fr. 
  vitrea 
  K. 
  

   Gotland: 
  Slite 
  (Cl.). 
  

  

  Fr. 
  pacifica 
  Grun. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  Diatoma 
  DC. 
  

  

  D. 
  tenite 
  Ag. 
  

  

  Grun. 
  Yerh. 
  Wien 
  1862, 
  p. 
  361. 
  

  

  In 
  brackish 
  and 
  almost 
  fresh 
  water. 
  Varies 
  as 
  to 
  size 
  

   and 
  form 
  of 
  tlie 
  valve, 
  and 
  density 
  of 
  the 
  striation. 
  Of 
  

   Grunows 
  (1. 
  cit.) 
  varr. 
  I 
  have 
  to 
  mention: 
  

  

  v. 
  normale 
  Grun. 
  

  

  K. 
  Bac. 
  PI. 
  17, 
  fig. 
  X, 
  6, 
  9—14; 
  Grun. 
  Verh. 
  Wien 
  1862, 
  

   p. 
  362. 
  

  

  Harbour 
  of 
  Pillau 
  (Schum. 
  1867), 
  Gotland: 
  Klintehamn, 
  

   Dalarö, 
  Helsingfors, 
  Hernösand 
  (Cl.). 
  

  

  v. 
  mesolepta 
  (K.) 
  Grun. 
  

  

  K. 
  Bac. 
  Fl. 
  17, 
  fio-. 
  XVI 
  1—3; 
  Grun. 
  1. 
  cit. 
  

  

  Feene, 
  Travemllnde 
  (Grun. 
  1. 
  cit.). 
  

  

  v. 
  elongatum 
  Lgb. 
  

  

  Grun. 
  1. 
  cit.; 
  VH. 
  D. 
  B. 
  Fl. 
  L, 
  %. 
  14 
  e, 
  18—22. 
  

  

  Harbour 
  of 
  Fillau 
  (Schum. 
  1867), 
  Gotland: 
  Klintehamn, 
  

   Dalarö, 
  Helsingfors, 
  Hernösand 
  (Cl.). 
  

  

  v. 
  pacliycephala 
  Grun. 
  

  

  VH. 
  D. 
  B. 
  Fl. 
  L, 
  fig. 
  15. 
  

  

  Vesterbotten 
  (VH. 
  1. 
  cit.). 
  

  

  D. 
  vulgäre 
  Bort. 
  

   VH. 
  D. 
  B. 
  Fl. 
  L, 
  fig:s 
  1—6. 
  

  

  Dalarö, 
  Hernösand 
  (Cl. 
  & 
  Moll. 
  Diat. 
  N:o 
  237). 
  

   v. 
  lineare 
  Sm. 
  

  

  VH. 
  D. 
  B. 
  FL 
  L, 
  fig:s 
  7, 
  8. 
  

   Dalarö 
  (tending 
  towards 
  the 
  foUowing 
  var.), 
  

   v. 
  constrictum 
  Grun. 
  

  

  Rare: 
  Upland, 
  Helsingfors, 
  Ångermanland: 
  Näske 
  (Cl.), 
  

   Haparanda 
  (Cl.). 
  

  

  