The British Carboniferous malacostracan fauna is reviewed and a revision of the Hoplocarida and Eumalacostraca of that fauna is presented. No detailed revision of Phyllocarida is attempted with the exception of the Hoplostraca. Four new genera and three new species are described. Twenty-one species constitute the fauna: Anthracocaris scotica, Anthracophausia dunsiana, Bairdops elegans, Belotelson traquairi, Crangopsis eskdalensis, C. socialis, Joanellia elegans, Kallidecthes eaagari, Minicaris brandi, Palaeocaris retractata, Permiceturus parki, Pleurocaris annulatus, Praeanaspides praecursor, Pseudogalathea macconochiei, Pseudotealliocaris etheridgei, Pygocephalus cooperi, P. dubius, Sairocaris elongata, Tealliocaris woodwardi, Waterstonella grantonensis, and a possible tyrannophontid stomatopod ("Perimecturus" pattoni) Includes bibliographical references (p. 125-129) The British Carboniferous malacostracan fauna is reviewed and a revision of the Hoplocarida and Eumalacostraca of that fauna is presented. No detailed revision of Phyllocarida is attempted with the exception of the Hoplostraca. Four new genera and three new species are described. Twenty-one species constitute the fauna: Anthracocaris scotica, Anthracophausia dunsiana, Bairdops elegans, Belotelson traquairi, Crangopsis eskdalensis, C. socialis, Joanellia elegans, Kallidecthes eaagari, Minicaris brandi, Palaeocaris retractata, Permiceturus parki, Pleurocaris annulatus, Praeanaspides praecursor, Pseudogalathea macconochiei, Pseudotealliocaris etheridgei, Pygocephalus cooperi, P. dubius, Sairocaris elongata, Tealliocaris woodwardi, Waterstonella grantonensis, and a possible tyrannophontid stomatopod ("Perimecturus" pattoni) Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-)