The occurence of Radiolaria in the Franciscan group in and near San Francisco, California, has been known for many years, since Hinde (1894) studied these organisms and considered them to be Jurassic in age. The discovery, during the past few years, of a few Foraminifera and megafossils in strata of this group has led to renewed interest in their age. Records, however, of megafossils in Franciscan rocks are so few that publication of the present information concerning another ammonite in these strata seems justified. The recording of the present fossil has been delayed because of its unavailability resulting from the...

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