British Ordovician and Silurian Proetidae (Trilobita)

Abstract

British Ordovician and Silurian proetid trilobites are described and referred to 12 genera, 4 subgenera, 36 named species and subspecies (11 new) and 21 other unnamed forms, distributed among the three subfamilies Proetinae, Tropidocoryphinae and Warburgellinae (subfam. nov.).The genera classified in the Proetidae probably evolved from two major stocks whose origins appear to lie in the early Ordovician hystricurine trilobites.