Morphological and stratigraphie information for 239 fossil dinoflagellate taxa known to occur in northern hemisphere palynomorph assemblages constitute the major part of this paper. To facilitate identification the dinoflagellate entities, the species, genera, or 'complexes' are arranged in 17 groups, of which 16 are based on morphological characteristics. The remaining group contains forms that could not be assigned appropriately to one of the morphological groups. Arrangement of the individual taxa into the morphological groups enables the major characteristics of the various groups to be compared easily and the critical features of dinoflagellates within a single group to be identified readily. The total ranges of the dinoflagellate cysts, expressed in both relative and absolute ages, are compiled in three range charts. Range information is also presented in a series of summarizing appendices. lllustrative material includes fine drawings for each of the 239 taxa. These drawings are organized into two sets; one set is arranged morphologically, whereas the other set is arranged stratigraphically. Four new morphological terms are introduced and defined: standard sexiform, inclined sexiform, contiguous operculum, and disarticulated ( or non-contiguous) operculum. We now consider Meiourogon­yaulax Sarjeant to be a junior taxonomie synonym of Lithodinia Eisenack 1935 emended Gocht 1975b. Accordingly, we return or attribute the species previously assigned to Meiourogonyaulax to Lithodinia. We also reassign Liesbergia scarburghensis (Sarjeant 1964) Berger 1986 to Trichodinium Eisenack and Cookson 1960 as a new combination and describe a new species, Tectatodinium grande.

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