Material examined.-Twenty specimens from CSUN loc. 1583, including one figured (USNM 531408), four specimens from an unknown locality (Burke Museum locality number B6980) in the Humptulips Formation (UWBM 97853 and 97854), and one specimen from a small presumed cold-seep carbonate block that was found on the banks of the Canyon River, Gray's Harbor County, Washington State, in the late Oligocene part of the Lincoln Creek Formation (USNM 531409). Recently, the discoveries of a vent gastropod with iron sulfide dermal sclerites (Waren et al., 2003), and of whale-bone specialists with symbiotic relationships previously unknown from the entire animal kingdom (Rouse et al., 2004), again highlighted our poor knowledge of deep-sea environments.
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