Title: Additional Acanthoceratids from Hokkaido : Studies of the Cretaceous Ammonites from Hokkaido and Saghalien-XXVIII
Abstract: blished and two new genera are proposed. Others are identified with or closely allied to already known species, which are revised on this occasion. Broadly speaking, the succession of acanthoceratids in the Cenomanian sequence of Hokkaido shows fairly good agreement with that of western Europe, if minor local differences are ignored. Numerous multituberculate species belonging to several genera occur in the Turonian, showing a considerable diversity.