-11- White-throated Storm Petrel (Nesofregetta albigularis) Expecting Fregetta grallaria, I was quite surprised to find Nesofregetta the only white-bellied Storm Petrel present along the southern equatorial counter-current. When taken into consideration the scarcity with which this species is recorded in close proximity to nesting colonies, I must conclude that Nesofregetta is an abundant bird of the counter currents transversed on this trip! Birds south of the equator are probably of Marquesas origin. It is quite possible that birds north of the equator are from the Christmas Island population. Least Petrel (Halocryptena microsoma) This species was recorded regularly in the seas surrounding the Revilla-Gigedos Islands and to the east. The majority of the population winters in the seas around Panama along with the Black Petrel (Oceanodroma melania) which was totally lacking from the area covered in this cruise. Red-billed Tropicbird (Phaethon aethereus) Red-billed Tropicbirds were found in proximity to the coast, or islands which they breed on. Unlike its larger relative, the Red-tailed Tropicbird, it was very rarely attracted to the ship. Red-tailed Tropicbird (Phaethon rubricauda) This species was found commonly in the Southern Hemisphere, regularly around Clipperton Island and occasionally in other areas with the exception of area "A". The origin of birds observed throughout the trip is quite difficult to determine. It may be safe to say that Southern Hemisphere birds were from the Marquesas, but this would have to be proven. Birds around Clipperton Island indicate previously unrecorded breeding population may be present but this is unconfirmed. If there isn't a breeding population in this area, the birds are probably from the Galapagos - 1,200 miles, or the Hawaiian Leewards - 3,500 miles away! Blue-footed Booby (Sula nebouxii) Blue-feet were encountered only rarely. They evidently do not wander far from their breeding islands.