Specimens of the nominal rpeciea Pscudopcntacrror whcclcri Hardy and P. pectoralis Hardy were examined morphologically and electrophoretically to test the validity of the two speciea. Samples were collected primarily from the Hancock Seamountr of the muthem Emperor-northern H8waiian Ridge as well as from the North Pacific open ocean and northweatern Hawaiian Irlands. Morphometric resulta indicate continuity between P. wheelmi and P. pectoralis. No evidence of rpeciea aeparation waa revealed in analysea of meristic and electre phoretic data. W e conclude that the North Pacific pelagic armorhead conrists of a ringle, metamorphic rpecies, which we. aa firrt reviaerr. elect to a l l P. whcclm'. A hypothesir ir propoaed that attributa morphological variation to different l i f e history rtages.
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