Abstract
Six new species of trilobites, Plicatolina quadrata, P. yakutica, Parabolina magna, P. monstruosa, P. angusta, and Parabolinites rectus are described. The trilobites were collected in the Tuora-Sis Range, Yakut ASSR, along the Sietachan and Neleger-Bysyta rivers, the Neleger and its tributaries, and also along the left bank of the Lena river, 6 km south of Chekurovka. All the occurrences of trilobites were in the Ogoner horizon which forms part of the zones of Protopeltura and Lotagnostus. - -R. A. Robison.
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