1 March on board "Golden Bear", Galapagos to Guayaquil, Ecuador but thus seemed to be no difference in size or flight between the two species, nor did I see any other differences. The double indistinction of the patch of the heel's was quite marked, and no small Oceanodroma I saw had as much black on the trail tip. Went to the store to see 15+ Black Petrels and 2 or 3 smaller Oceanodroma following the boat, all out over 200 ft as has been the rule. Most are way off, barely visible in binoculars. Went again to the Bow, after seeing about 30 of a medium-large guy porpoise and 10 or few petrels heading towards the bow. Between 5 and 5:30 saw 4 Black Petrels, 7 white-rumped Oceanodroma (which seemed to be 3 Castos by slow flight) and 4 tethys by fast flight), a dark-rumped Oceanodroma with the flight of and prob. the size of O. tethys or castros, dark under the wings, and not with any other petrel. Not sure what this is. Can't see the tail well; The wing beat is fast, al- mort no pause between strokes and quite high, and (4-5 ft) the bird goes quite high off the water. The "Bear" flew into a Phalaropes which sounded like a Red but could have been Northern; the wind and engines may have distorted what I heard. Between 5:30 and 6 saw 3 Northern Phalaropes (2 at once), 2 Black Petrels, 3 white-rumped Oceanodroma