In 1979, under contract from the National Marine Fisheries Service (NMFS), Southwest Fisheries Center (SWFC), we began a study of the population biology and ecology of Lagenorhynchus obliquidens in the eastern North Pacific. We have since reported on distribution, seasonal movements and abundance, based on all records available through 1979 (Leatherwood and Walker, 1982; Leatherwood et al. , 1984). This paper reports findings on biology and geographic variation in white-sided dolphins in the northeastern Pacific based on examination of literature and specimen materials - external measurements, skulls, skeletons and osteological data, teeth, reproductive organs, photographs, stomach contents and parasites.

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