Shells of "Idoceras" are evolute, with a wide umbilicus; ribbing strong, bifurcate high on flanks. It is considered a modified bifurcate merging kinship system. It is considered a modified Bifurcate merging (Iroquois) kinship system. Some fronds are not pinnately compound (or simple), but may be palmate, costapalmate, or bifurcate. Near the posterior edge of the internal naris they bifurcate. This is a system later called "bifurcate merging" or Iroquoian kinship following Morgan. It uses Bifurcate merging, but only the Iroquois system uses BM as a label. Time may also overlap, repeat, or bifurcate into multiple possibilities. It has two spiral arms that bifurcate after wrapping halfway around the nucleus. The public interests to bifurcate Tiruvannamalai district and create a new district. In our existing models of formal education, we bifurcate what Dewey viewed as indispensable. The land reforms carried out in North and South Vietnam bifurcate after 1954.