Aechmina gibberosa Knight, 1928 † accepted as Cyathus gibberosus (Knight, 1928) † accepted as Ardmorea gibberosa (Knight, 1928) † (original description)
Amphissitidae Knight, 1928 † (original description)
Bairdia auricula Knight, 1928 † accepted as Orthobairdia auricula (Knight, 1928) † (original description)
Bairdia citriformis Knight, 1928 † (original description)
Bairdia haworthi Knight, 1928 † accepted as Cryptobairdia haworthi (Knight, 1928) † (original description)
Bairdia moorei Knight, 1928 † accepted as  † (original description)
Bairdia seminalis Knight, 1928 † accepted as  † (original description)
Bairdia subcitriformis Knight, 1928 † (original description)
Bythocypris parallela Knight, 1928 † accepted as  † (original description)
Bythocypris pediformis Knight, 1928 † accepted as  † (original description)
Bythocypris rostrata Knight, 1928 † accepted as Basslerella rostrata (Knight, 1928) Cooper, 1946 † (original description)
Carbonia lenticularis Knight, 1928 † accepted as  † (original description)
Coryellites parallela (Knight, 1928) Cooper, 1946 † accepted as  † (original description)
Coryellites pediformis (Knight, 1928) Cooper, 1946 † accepted as  † (original description)
Cryptobairdia seminalis (Knight, 1928) † accepted as  † (original description)
Cytherella missouriensis Knight, 1928 † accepted as  † (original description)
Healdia leguminoidea Knight, 1928 † (original description)
Healdia limacoidea Knight, 1928 † (original description)
Healdia longa Knight, 1928 † (original description)
Healdia nucleolata Knight, 1928 † (original description)