Thirty-four planktonic and 132 benthonic species of Foraminifera from the cored section of the Experimental Mohole drilling near Guadalupe Island, off Baja California, are listed. The benthonic species represent a deep-water fauna from deeper than 1,000 meters. The sampled section is believed to be Miocene and Pliocene. The Miocene section is correlated tentatively, in part, with the Luisian and Mohnian stages of California; the lower portion shows some affinity with the Globorotalia fohsi Zone of the Caribbean region. Two new species are described: Bolivina guadalupae and Melonis guadalupae.