﻿BIHANG 
  TILL 
  K. 
  SV. 
  VET.-AKAD. 
  HANDL. 
  BAND 
  6. 
  N:0 
  21. 
  47 
  

  

  Fam. 
  Eupodiscese. 
  

  

  Actinocyclus 
  Ehb. 
  

  

  A. 
  Ehrenhergii 
  Ralfs. 
  

  

  Size 
  as 
  large 
  as 
  the 
  inarine 
  form. 
  

  

  Gotland: 
  Slite 
  (Cl), 
  Vaxholm 
  (Cl.). 
  

  

  Fam. 
  Coscinodisceee. 
  

   Coscinodisciis 
  Ehb. 
  

  

  C. 
  polyacanthos 
  v, 
  balticus 
  Grtjn. 
  

  

  Aret, 
  Diat. 
  p. 
  112. 
  

  

  Occurring 
  in 
  single 
  specimens 
  throughoiit 
  the 
  Baltic. 
  

  

  Subfoss.: 
  coramon 
  in 
  bottomclay. 
  Occurs 
  in 
  blackclay,^ 
  

   in 
  silt 
  from 
  Rosla2:en 
  and 
  in 
  the 
  bathino-silt 
  from 
  Ronnebv, 
  

   Dalarö, 
  Furusund 
  and 
  Xorrtelje. 
  

  

  C. 
  suhsalsus 
  nov. 
  spec. 
  

   Flate 
  III, 
  f 
  33. 
  

  

  Disc 
  slightly 
  convex, 
  marked 
  with 
  pearl-like 
  puncta, 
  which 
  

   are 
  arraueed 
  in 
  irresular 
  concentric 
  and 
  radiatino- 
  lines. 
  The 
  

  

  O 
  O 
  C? 
  

  

  pearls 
  a 
  little 
  less 
  dense 
  in 
  the 
  middle 
  than 
  half 
  way 
  to 
  tho 
  

   margin, 
  become 
  gradually 
  smaller 
  near 
  the 
  margin. 
  Diam. 
  of 
  

   the 
  disc 
  0,035 
  — 
  0,045 
  mm., 
  pearls 
  12 
  in 
  0,01 
  mm. 
  

  

  Rare: 
  Upland: 
  Lidö, 
  Norrtelje, 
  Karlshamn. 
  

  

  Subfoss.: 
  Diat. 
  deposit 
  at 
  Sunda 
  in 
  Blidö, 
  Upland. 
  

  

  C. 
  Oculus 
  Iridis 
  Ehb. 
  

  

  Subfossil: 
  alluv. 
  clay 
  from 
  Stentorpa, 
  parish 
  of 
  Wassunda, 
  

   Upland. 
  

  

  According 
  to 
  Schumann 
  the 
  following 
  species 
  are 
  found 
  

   in 
  the 
  Baltic 
  ; 
  

  

  C. 
  radiatus 
  Ehb. 
  

   C. 
  suhtilis 
  Ehb. 
  

   C. 
  excentricus 
  Ehb. 
  

  

  Hyalodiscns 
  Bail. 
  

  

  H. 
  scoticus 
  (K.) 
  Grun. 
  

  

  Aret. 
  Diat. 
  p. 
  116; 
  Podosira 
  hormoides 
  Sm. 
  

  

  Marine 
  species, 
  very 
  seldom 
  foiind 
  living 
  in 
  the 
  Baltic: 
  

   Öresund 
  (Heib. 
  Cousp.), 
  Malmö, 
  Sölvesborg 
  (in 
  mnd), 
  Karls- 
  

   hamn 
  (d:o), 
  Travemiinde, 
  Svinemlinde, 
  Norrtelje 
  in 
  almost 
  

   fresh 
  water. 
  

  

  