I was first introduced to the jaw of Cernictis repenningi as a Master's student at the University of Arizona, under the supervision of E. Lindsay, where I did my thesis on the small mammals of the Bidahochi Formation (Baskin 1978, 1979). Although I briefly mentioned the specimen in my thesis, at that time I had limited familiarity with mustelids and did not include it in my publications on the Bidahochi Formation. While a graduate student at the University of Florida, I met with C. Repenning at the National Museum of Natural History where he had an office for the Paleontology and Stratigraphy Branch of the USGS. He was very forthcoming with information about the stratigraphy and paleontology of the Bidahochi Formation and gave me free access to specimens that he had collected that were in the USNM collections. My doctoral dissertation was a study of late Miocene carnivorans from Florida. At that time, I began a productive relationship with R. Tedford at the American Museum of Natural History, which led to led to my publication on North American Tertiary mustelids (Baskin 1998). It was during my time at the AMNH that I became better acquainted with the identification of the White Cone mustelid named in this paper. I thank L. Jacobs and L. Taylor for inviting me to participate in this volume and giving me the opportunity to finally describe the specimen. Figure 1 was drawn by W. Korth. Two anonymous reviewers provided comments that helped improve the manuscript.