Family Cynosuchidae. ? Middle Triassic. Cynosuchus Owen, South Africa.
Family Cynognathidae. Septomaxillae within nares; molars cuspidate; [posterior] mandibular bones more reduced.
Upper Triassic. Cynognathus Seeley, Lycochampsa Broom, South Africa.
Family Diademodontidae. Upper Triassic. Diademodon Seeley, Gomphognathus Seeley, Trirachodon Seeley, South Africa. ? Upper Triassic Cynochampsa Owen, South Africa.
5. Theriodontia (?) Incertae Sedis
Upper Triassic. ? Dromotherium Emmons, North Carolina. Tribolodon Seeley, Karoomys Broom, South Africa.
Lower Jurassic. Tritheledon Broom, Pachygenelus Watson, South Africa.
[May be either primitive mammals or cynodonts—too imperfectly known to enable one to decide. Probably each is the type of a distinct family. —R. Broom.]
