The genera Batocrinus and Dizygocrinus of the monobathrid camerate crinoid family Batocrinidae are restricted respectively to species of post-Keokuk and post-Burlington Mississippian age. The new genera Abatocrinus, type species Actinocrinus turbinatus Hall, and Azygocrinus, type species Actinocrinus dodecadactylus Meek and Worthen, are proposed for older species in the family long assigned to the 2 former genera. Revised synonymies of species judged valid in all 4 genera are included, based on study of infraspecific variation in numbers of arms in these crinoids.

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