Atrina (Servatrina) oldroydii DALL 1901
Shell large, dark brown, relatively thick, with low commarginal lamellae
and obscure, low radial ribs; periostracum thick. Length to 360 mm.

From San Pedro, CA to Punta Pequena, Baja California Sur, in 2-46 m.

See Hertlein and Strong(1943:pg. 166)
    Eastern Pacific Expedition of the New York Zoological Society. XXXII.
Mollusks of the West Coast of Mexico and Central America. Part II.
Zoologica 28(3): 149-168, plate 1
    Keen (1971: pg. 75)
    Sea Shells of Tropical West America; Marine Mollusks from Baja
California to Peru, 2nd. edition.

The above is excerpted from Coan, Valentich Scott, and Bernard, Bivalve
Seashells of Western North America, published by the Santa Barbara Museum
of Natural History.  This is an essential reference for anyone interested
in the eastern Pacific Bivalves from Alaska to Baja California.  It was
published in 2000.
Charlie
******************************************************************************
Charlie Sturm, Jr
Research Associate - Section of Invertebrate Zoology
                     Carnegie Museum of Natural History, Pittsburgh, PA
Assistant Professor - Family Medicine

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