﻿BIHANG 
  TILL 
  K. 
  SV. 
  VET.-AKAD. 
  HANDL. 
  BAND 
  6. 
  N:0 
  21. 
  33 
  

  

  Pleurosigma 
  Sm. 
  

  

  P. 
  elongatum 
  Sm. 
  

  

  Aret. 
  Diat. 
  p. 
  50. 
  VH. 
  D. 
  B. 
  Pl. 
  XVIII, 
  f. 
  7. 
  

   Harbour 
  of 
  Travemlinde 
  (Ostsee 
  Exp. 
  1871, 
  p. 
  177), 
  

   Kalmar, 
  Vestervik, 
  Helsingfors. 
  

  

  P. 
  cBstuarii 
  Sm, 
  

  

  Malmö 
  (Cl. 
  & 
  Moll. 
  Diat. 
  N:o 
  13Ö). 
  

  

  v. 
  minutum 
  Geun. 
  

  

  In 
  tlie 
  Baltic 
  (Schum. 
  1867). 
  

  

  P. 
  strigosum 
  Sm. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  • 
  

  

  P. 
  Nuhemda 
  Sm. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  P. 
  intermedium 
  Sm. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  P. 
  attenuatuni 
  Sm. 
  

   Geun. 
  Aret. 
  Diat. 
  p. 
  54. 
  

   Södermanland: 
  Häringe, 
  Helsingfors. 
  

   Subfoss.: 
  Furusund 
  bathina; 
  slick. 
  

  

  P. 
  Hijypocampits 
  Sm. 
  

  

  Aret. 
  Diat. 
  p. 
  54; 
  VH. 
  D. 
  B. 
  Pl. 
  XX, 
  fig. 
  3. 
  

  

  In 
  the 
  harbour 
  of 
  Travemlinde 
  (Ostsee 
  Exp. 
  1871, 
  p. 
  177). 
  

  

  P. 
  Fasciola 
  Sm. 
  

   VH. 
  D. 
  B. 
  Pl. 
  XXI, 
  lig. 
  8. 
  

  

  In 
  the 
  harbour 
  of 
  Travemiindc 
  (Ostsee 
  Exp. 
  1871, 
  p. 
  

   177), 
  Kalmar. 
  

  

  P. 
  aciiminatum 
  Sm. 
  

  

  In 
  the 
  Baltic 
  (Schum. 
  1867). 
  

  

  P. 
  Brehissonii 
  Grun. 
  

   VH. 
  D. 
  B. 
  Pl. 
  XXI, 
  f. 
  6. 
  

   Kalmar. 
  

  

  P. 
  SjMnceri 
  Sm. 
  

  

  Vaxholm 
  (Cl.), 
  Malmö 
  (Cl.), 
  Helsingfors. 
  

  

  P. 
  distortuin 
  Sm. 
  

   , 
  Vaxholm 
  (Cl.). 
  

  

  Schum. 
  1867 
  mentions 
  as 
  occurriug 
  in 
  the 
  Baltic 
  the 
  

   loUowing 
  to 
  me 
  unknown 
  species: 
  

  

  3 
  

  

  