Matsumoto & Inoma 1991. The mid-Cretaceous ammonites of the family Kossmaticeratidae from Japan. Part III. Descriptions of the species from the Shumarinai-Soeushinai area of Hokkaido. (Mid-Cretaceous ammonites from the Shumarinai-Soeushinai area, Hokkaido Part III). (Studies of the Cretaceous ammonites from Hokkaido - LXXI). Palaeontological Society of Japan Special Papers, 33, December 10 1991: 103-122