Náttúrufræðingurinn - 1957, Síða 49

KÍSILÞÖRUNGAR í SELTJARNARMÓNUM
205
Grammatophora angulosa (Ehr.). G. angulosa var. islandica (Ehr.). G. mar-
ina (Lyngb.) Kiitz.
Gyrosigma acuminatum (Rabh.). G. attenuatum (Kiitz.).
Hantzschia amphioxys (Ehr.).
Hyalodiscus scoticus (Grun.).
Melosira italica (Ehr.). Kiitz.
Navicula abrupta (Greg.). N. bialbata (Per.). N. digitoradiata (Greg.). N.
Galikii (Pant.). N. lyra conf. latissima (Greg.) N. peregrina (Ehr.). N. pupula
(Kiitz.). N. pusilla (W. Sm.). N. semen (Ehr.). N. tuscula (Ehr.).
Nitzschia angularis (W. Sm.). N. capitellata Hust.). N. commutata (Grun.).
N. distans (Greg.). N. navicularis (Bréb.) Grun. N. palea (Kiitz.). N. punctata
(Grun.). N. socialis var. baltica (Grun.). N. tryblionella (Hantzsch). N. trybli-
onella var. victoriae (Grun.).
Opephora marina (Greg.) Pet.
Pinnularia borealis (Ehr.). P. hustedtii (Mölder). P. nobilis (Ehr.). P. micro-
stauron (Ehr.). P. pulchra (Östrup). P. sp.
Pleurosigma anguletum (Quek).
Rhabdonema arcuatum (Ag.) Kutz. R. sp.
Rhoalodia gibba (O. Miill.). R. gibba var. ventricosa (Ehr.). Grun. R.
musculus (Kiitz.) O. Miill.
Rhoicosplienia curvata (Kiitz.) Grun.
Stauroneis anceps (Ehr.). S. parvula (Grun.). S. phoenicenteron (Ehr.). S.
Smitliii (Grun.).
Surirella linearis (W. Sm.). S. ovalis Bréb.).
Synedra ulna (Nitzs.) Ehr. S. ulna var. oxyrliynchus (van Heurck).
Tabellaria fenestrata (Lyngb.) Kiitz. l'. flocculosa (Roth) Kiitz.
Tetracyclus rupestris (Grun.).
Thalassiosira lecipens (Grun.).
Tracyneis aspera (Ehr.).
SUMMARY
Diatoms in the Submerged Peat in Seitjörn
by Jón Jónsson.
The present paper is mainly an extract of a paper, Niváförándringar pá Is-
land, that will soon be published in Geografiska Annaler, Stockholm.
The writer presents a diagrant of the occurrence of diatoms in the Seltjörn
peat. Tlie cliagram shows that at the time when the formation of peat started
Seltjörn was quite separated from the sea and probably its level was then at least
as high as the present high water leved. The peat was formed entirely in fresh
water. A list of diatoms found in the Seltjörn section, is added.