Olivella quadriplicata Clark, 1918

"Shell small, solid, subovate; spire less than one-third of height; whorls five, smooth, gently convex. Sutures narrowly channeled. Aperture long and narrow outer lip thin; pillar short, slightly twisted, with a strong pillar-plate, near the lower end of which is an oblique, fairly deep groove; above this groove there are four or five medium fine plications, with one heavier plication below the groove. Dimensions. — Height, about 10 mm.; height of body whorl, 7.5 mm.; greatest width of body whorl, 5 mm.". Oligocene. San Ramon, Contra Costa County, California, USA.