Abstract
Forty-six gastropod species are described from the Cenomanian of the Kassenberg quarry in Mulheim a. d. Ruhr, Germany, twelve of them are new. They are assigned to 33 known genera and two new genera.Deikella n. gen. is introduced for threeTurbo-like species which have strong axial ribs in contrast to the smooth RecentTurbo. Frydatinus n. gen. is introduced for a loosely coiled archaeogastropod with a round aperture and spine-like extensions on its outer side. A new species ofDelpeya is introduced, and it is suggested that this genus derived from the JurassicNummocalcar. The high number of pleurotomariids indicates that these gastropods still lived on rocky shores during the Cenomanian, in contrast to modern times, where they are restricted to hardgrounds in deep-water. The new species are:Bathrotomaria harasewychi, Deikella spinicostata, Deikella ruhrensis, Deikella? muelheimensis, Trochus rauenorum, Margarella (Promargarita) spiraloides, Margarella (Promargarita) trochoides, Semisolarium boehmi, Onkospira perrilliatae, Delpeya hilperti, Neritopsis kasei, andOtostoma kassenbergensis.
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