Abstract
Recognition of a primate in the mammalian assemblage now being recorded from one of the faunal stages of the Sespe, north of the Simi Valley, California, comes with startling abruptness, yet is not wholly unexpected. No fewer than five fragments of jaws, probably representing as many individuals, have been found recently. The sudden appearance of this material in the collections of fossil mammalian remains obtained at Locality 150 Calif. Inst. Tech. Vert. Pale. commands attention when it is stated that excavations at this site have been in progress more or less continuously during the past two years.
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