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Collection from the marine Alapah Limestone, Brooks Range, Alaska, contain abundant and diversified ostracodes and include growth series of several taxa referable to Paraparchites. Study of these populations and a review of the world literature make it possible to discriminate several new genera in this group. I conclude that the ostracodes in these genera should be oriented so that the plenate end is posterior; that dimorphism is shown in the width of the posterior and (or) width below the midheight; that the presence or absence of dorsoposterior spines is constant within genera, and that these spines or tubercles, unlike those in the Leperditicopida, are not eye tubercles; that adults of some genera in the Paraparchitidae may be smaller than instars of other genera in this group; and that reversal of overlap and hingement is not a taxonomic criterion in this group. The presence of a well-developed inner lamella and a cyprid adductor muscle-scar pattern in some of the genera remove this group from the Palaeocopida as presently defined. In order to document the above conclusions, several genera and species from areas other than Alaska are discussed and illustrated. The following are new: Paraparchites kellettae, Shivaella n. gen., S. suppetia, S. mertiei, Chamishaella n. gen., C. aenigmatica, C. brosgei, Shishaella n. gen., S. williamsae, Shemonaella n. gen., S. dutroi, and Coelonellidae, n. fam.

New Late Mississippian ostracode genera and species from northern Alaska; a revision of the Paraparchitacea