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The specimens and (or) photographs of the 21 named taxa used for California Holocene olivellids were examined to recognize four modern species now assigned to the genus Callianax and one species presumed extinct. The California Holocene species include C. alectona, C. biplicata, C. C. diegensis, and C. strigata, while the extinct species is Olivella pedroana. Other olivellid names previously used in California are also discussed and these include O. baetica, O. niplicata alba, O. biplicata angelana, O. biplicata brunnea, O. biplicata fucana, O. biplicata lapillus, O. biplicata parva, O. boetica, O. boetica diegenensis, O. boetica mexicana, O. dama, O. glandinaria, O. intorta, O. minuta, O. nota, O. porteri, and O. pycna. Olivella dama and O. intorta are valid species that occur further south in Mexico and are not present in California today despite reports. Olivella nota is also a valid name but for a west Pacific species. 38 pp., 23 figs, 2 color plates, br. 4 [21.5 x 28 cm].