Late Cretaceous gastropods belonging to genus Lysis Gabb, 1864, from the Pacific slope of North America, bridge the morphologic gap between turbiniform trichotropids and limpet-like calyptraeids. Development of the depressed and broadened inner lip/co . . .

Numerous specimens of the neritid gastropod Nerita (Bajanerita) n. subgen. californiensis (White, 1885) are present in the Upper Cretaceous Rosario Formation at Punta Banda, Baja California, Mexico (Figure 1). Marincovich (1975) assigned these strata . . .

Paleoecology of whale-fall habitats from deep-water Oligocene rocks, Olympic Peninsula, Washington state

Igonoia, a new genus of a margaritine vetigastropod, is recognized from Lower and Upper Cretaceous rocks in the northeastern Pacific, in the region extending from Vancouver Island, British Columbia, to southern California. Eight species are known, fiv . . .

Two new genera and ten new species of shallow-marine, warm-water gastropods are reported from several Upper Cretaceous formations found between British Columbia and southern California. The buccinid Zaglenum new genus is represented by two new species . . .

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, . . .

A new genus, a new subgenus, and five new species of pterioid bivalves are described from shallow-marine faunas in the middle lower to middle Eocene Bateque Formation in the vicinity of Laguna San Ignacio to about 105 km southward, Pacific coast of Ba . . .

The clypeasteroid echinoid Astrodapsis bajasurensis n. sp. is described from upper middle Miocene beds of the Isidro Formation near the mouth of Arroyo Mezquital on the Pacific coast of north-central Baja California Sur, Mexico. The new species is the . . .

Opines constitute a small subfamily of Mesozoic astartid bivalves that lived mostly in the Tethys Sea region. They first appeared in western Europe during the Middle Triassic, became most widespread during the Jurassic and had their first undoubted ap . . .

Specimens of the large, shallow-marine, volutid gastropod Volutoderma Gabb, 1877, herein recognized only from strata of Late Cretaceous (Coniacian through early Maastrichtian) age in British Columbia, Washington, California, and Baja California have c . . .