Roemeripora tollinoides sp. n. (Anthozoa, Tabulata) is described from Upper Carboniferous strata of SW Nordenskiöld Land (Ingeborgfiellet), Bellsund area in West Spistbergen (Svalbard). The new species is characteristic for a phacelo-cerioid structure of entire corallum.

Starostinella nordica gen. et sp. n. is described from the uppermost Permian (Kapp Starostin Formation) of the Kapp Starostin (Isfjorden) in West Spitsbergen. The new genus is attributed to Trachypsammiidae Gerth - a family incertae sedis among Cnidaria. Members of the Trachypsammiidae have been previously associated with different higher rank taxa within the Cnidaria, or their skeletons were interpreted as a result of symbiosis of a cladochonoidal organism (Tabulata) with an indeterminate hydroid or stromatoporoid. S. nordica gen. et sp. n. seems to support the latter assumption. Hydrocoralla of S. nordica have a simpler structure than those of other Trachypsammiidae and are branching like those of Cladochonus. Their thick-walled, horn-shaped hydrocorallites are surrounded with a very thick cortical zone of sclerenchyme organized into trabecular microstructure. The proper corallite wall is fibro-radial in structure, sharply distinct from the outer cortical zone.

The paper presents descriptions and illustrations of Anthracoporella spectabilis Pia (Dasycladaceae) and Palaeoaplisina laminaeformis Krotov (Hydrozoa) from the Treskelodden Formation (Lower Permian, Sakmarian) of the Hornsund area (Treskelen, Urnetoppen), and Chaetetes arcticus sp. n. (Demospongiae) from the „Wordiekammen Limestone" (Pernio — Carboniferous) of the Isfjorden area of the southern and central part of Spitsbergen. A. spectabilis and P. laminaeformis common in the Hornsund area are also known from the northern Ural Mts. and Timan.

New coral taxa Tetraporinus siedlecka sp. n. and Roemeripora aspinosa major ssp. n. are erected from the Lower Permian (Sakmarian and Artinskian) Treskelodden Formation of Hornsund area, Spitsbergen and Syringopora sp. similar to S. subreticulata Nowiński, 1991 are described. Studies on stable isotope ratios of carbon and oxygen in the skeletons of tabulate and rugose corals from Hyrnefjellet and Treskelen areas show that these organism did not frac­tion the isotopes to much. The differences in isotope fractionation, both for carbon and oxygen, reached 2 ‰ comparable to the concurring brachiopods, accepted as reference level.