. Bulletin of the British Museum (Natural History) Zoology. . Figs 79-82 Steinia muscorum from life (Figs 79, 80) and after protargol impregnation (Figs 81, 82). 79 Ventral view. 80 Lateral view. Red granules (c. 1 urn) close beneath the pellicle and in the ctyoplasm. 81, 82 Infraciliature in ventral and dorsal view. pairs only. Dorsal cilia in vivo c. 3 um long. Caudal cirri on kineties 1,2, and 4. Comparison with related species. So far only 2 Oxytricha species with subpellicular granules have been described: O. granulifera Foissner & Adam, 1983 and O. rubripuncta Berger & Foissner,
. Bulletin of the British Museum (Natural History) Zoology. . Figs 79-82 Steinia muscorum from life (Figs 79, 80) and after protargol impregnation (Figs 81, 82). 79 Ventral view. 80 Lateral view. Red granules (c. 1 urn) close beneath the pellicle and in the ctyoplasm. 81, 82 Infraciliature in ventral and dorsal view. pairs only. Dorsal cilia in vivo c. 3 um long. Caudal cirri on kineties 1,2, and 4. Comparison with related species. So far only 2 Oxytricha species with subpellicular granules have been described: O. granulifera Foissner & Adam, 1983 and O. rubripuncta Berger & Foissner, 1987. Oxytricha longigranulosa differs from these species in the shape, size, colour, and arrange- ment of the subpellicular granules and the number of dorsal kineties and adoral membranelles. The beginning of the morphogenesis is rather similar to that of O. granulifera (Foissner & Adam, 1983). Steinia muscorum Kahl, 1932 Discussion and additional observations (Figs 79-82, Tables 1, 11). Since 1982 we have observed many populations of this species and found them to be usually a little wider than that figured in Foissner (1982). Thus, we show the morphology of such a population. The biometrical data agree well with that of Buitkamp (1977/?) and Foissner (1982). In vivo 140-160 x 55-60 urn, about 2 : 1 flattened. Buccal area large, partly covered by a hyaline projection. Feeds on fungal spores, zooflagellates, testaceans {Schoenbornia sp.), and ciliates (Odontochlamys sp., Opercularia sp., Gonostomum sp.). Very rarely a seventh dorsal kinety, which consists of 2- 4 basal body pairs only. Urosoma octonucleata nov. spec. Diagnosis. In vivo about 140-180 x 25-40 urn, vermiform. 8 macronuclear segments and 25 adoral membranelles on average. 3-4 transverse cirri (including the ventral cirri nearby). Type location: Soil in Garajan Kap, Madeira, Portugal. Description (Figs 83-88, Tables 1,11). Anterior end rounded, posterior one tapered and usually bent to the right. About 2 : 1 fl
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