Williamsoceras adnatum (FOSSIL) (Flower, 1964 †)
Williamsoceras ankhiferum (FOSSIL) Flower, 1968 †
Allotrioceras bifurcatum (FOSSIL) Flower, 1955 †
Williamsoceras compressum (FOSSIL) Flower, 1976 †
Williamsoceras ellipticum (FOSSIL) Flower, 1976 †
Mirabiloceras multitubulatum (FOSSIL) Flower, 1955 †
Williamsoceras pedunculatum (FOSSIL) Flower, 1968 †
Cacheoceras trifidum (FOSSIL) Flower, 1968 †
Cacheoceras uninodum (FOSSIL) Flower, 1976 †