ABSTRACT In Part 2 those ostracods belonging to the Treposellidae, Beyrichiidae and Beyrichiacea Family Uncertain are described, and are referred to a total of 17 genera and 35 named species. The Treposellidae comprises six genera (one new) and seven species (four new). The Beyrichiidae comprises Beyrichiinae (five genera, one new; one new subgenus; and 19 species, five new) and Kloedeniinae (four genera; and six species). Beyrichiacea Family Uncertain comprises two genera (one new) and three species (one new). A total of seven other forms are referred to the Treposellidae, Beyrichiidae and Beyrichiacea Family Uncertain under open nomenclature or are simply recorded. The biostratigraphy of British Silurian Beyrichiacea and their palaeoecological and palaeobiogeographical context is also documented.
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