Three distinct species ofBelemnopsisare present in the Heterian stratotype. Two of them,Belemnopsis annaen. sp. andBelemnopsis maccrawin. sp., are described herein and the description of the third,Belemnopsis keariStevens, is emended.B. annaeis of lower Heterian age.B. maccrawiandB. keariappear in the upper Heterian and their zones are partially overlapping. A fourth illdefined population consisting of a heterogeneous assortment of several taxa is present in the middle Heterian. The three named species are present in restricted sets of beds and because their zones apparently represent short time intervals they are expected to be of stratigraphic value.