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This paper examines the field identification, distribution, and taxonomy of the six species of Pachyptila. Particular attention is given to the identification of storm-cast material. The data include observations of prions at sea, on their breeding grounds, and 10,086 specimens examined over a 21-year period from 1958 to 1979. The validity of the six recognised species of Pachyptila is reaffirmed, and one subspecies each of the Fairy Prion (Pachyptila turtur) and the Fulmar Prion (Pachyptila crassirostris) is retained. The need for further ecological data, better food analyses, and carefully defined behavioural studies is stressed. The value of biochemical genetics for elucidating the speciation mechanisms of Pachyptila emphasises the preliminary nature of the present findings.