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By Chester A. Arnold

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Two species of have been described from the lowermost Jurassic of east Greenland and one from the late Triassic of England. Naiadita. a fossil of long disputed affinities and also from the late Triassic of England, is now definitely referred to the Bryophyta, and is probably the most Hepaticites known fossil representative of this group of plants. Naiadita, with one species, N. lanceolata, is a small plant 1 to 3 cm. The linear to rounded high, with a slender sparsely branched axis. completely leaves are arranged in a loose spiral and are attached by a broad base.

Bertrand and Bernard Renault, sections of decayed silicified and who examined especially prepared thin and coprolites of calcified plant tissue In material ranging in age from Devonian to Jurassic reptiles and fishes. they found a great variety of spherulitic and rodlike objects, which they Micrococcus Zeilleri is described as species of Micrococcus and Bacillus. cuticular membranes which make " up the so-called paper coal" found at Toula in Russia. Renault believed that these objects were the remains of the organisms responsible for the disintegration of the cellular tissues of the plants that compose the coal seam.

Discovery of life in the Archean, Jour. Geology, 33, 1925. : Naiadita, a fossil bryophyte with reproductive organs, Ann. BryoL, 12* 1939. Plants that form reefs and islands, Sci. Monthly, 36, 1933. , 1937. : : Colorado Univ. Studies, 23, 1936. Lime secreting algae and algal limestones from the Pennsylvanian of central Colorado, Geol. Soc. America Bull, 51, 1940. , 38 (1), 1943. H. LANG: Old Red Sandstone plants showing structure, from Chert bed, Aberdeenshire, pt. V, Thallophyta, Royal Soc. , 52, 1921.

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