Rare specimens of three new species of the Late Cretaceous buccinid gastropod Deussenia Stephenson, 1941, are reported from California. Deussenia sierrana sp. nov. is from lower Campanian strata in the Chico Formation in the Pentz area, Butte County, . . .

New morphologic information about the aperture of the brackish-marine Eocene gastropod Loxotrema turritum Gabb, 1868, allows for reassignment of this species from family Thiaridae to family Melanopsidae and shows that L. turritum is most closely relat . . .

The Cretaceous record of the nuculid bivalve Acila (Truncacila) Grant & Gale, 1931, is established for the first time in the region extending from the Queen Charlotte Islands, British Columbia, southward to Baja California, Mexico. Its record is repre . . .

Two new species of the siliquariid gastropod Tenagodus and one new species of the vermetid gastropod JSerpulorbis are described from Paleogene strata along the Pacific coast of southwestern North America. Th e new species of Tenagodus are the first re . . .

Seventeen species of epitoniid gastropods are discussed from Upper Cretaceous shallow-marine rocks in British Columbia, California, and northern Baja California. Eleven of the species are new: Opalia atra, Opalia cavea, Amaea trifolia, Amaea cerva, Am . . .