Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1975, Page 32

Náttúrufræðingurinn - 1975, Page 32
26 NÁTTÚRUFRÆÐINGURINN — Mjög lík A. filicula, en um tvöfalt stærri. Sepaþekjur 0,8—1,0 mm, og opið snýr meir út á við.................. .................... Abietinaria abietina (Linné) (19. mynd) 51 Út frá snúnum stofni ganga þéttar, stuttar og marggaffal- greindar greinar (ung sambýli þó fjaðurgreind), sem gera sambýlið að löngum (allt að 30 cm), mjóum sívalningi. Sepaþekjur sitja alveg ofan í greinunum................. .................................. Thuiaria thuja (Linné) — Sambýlið fjaðurgreint, stofninn snúinn, þannig að greinar virðast koma frá öllum hliðum (ath. flest íslenzk eintök hafa ekki snúinn stofn, og liggja þá greinarnar í sama fleti). Greinarnar langar, ógreindar. Sepaþekjur í hverri röð snúa opum sitt á hvað . . Thuiaria alternitheca Lævinsen SU MM ARY — Hydrozoa — by Erling Ólajsson A general introduction to the class Hydrozoa is given. Twenty one species collected at the southwest coast of Iceland are listed with localities. One oí them, Sertularella tenella (Alder), is recorded as new to the Icelandic fauna. One live colony was collected from a dead shell trawled at 35 m in Faxaflói, 64° 05'N, 22° 31'W, in October 1971. A key to the coastal species of Iceland and figures of the twenty one species mentioned above are given. HEIMILDARIT Kramp, P. L., 1926: Medusae II., The Danish Ingolf-Expedition V: 10. — 1935: Polypdyr, 1. Ferskvands-ogGopledolypper. Danmarks Fauna 41. Kbh. — 1938: Marine Hydrozoa. Hydroida. The Zoology of Iceland, II. part 5a. Copenhagen. Scemundsson, B., 1912: Bidrag til Kundskaben om de islandske iydroider II. Vid. Medd. nat. For. K0benhavn 63: 67—107.
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