RED-TAILED TROPICBIRD Two collected Nearly all were observed in the western portions of this cruise, with the largest numbers south of 10°S. WHITE-TAILED TROPICBIRD Only three were observed in the extreme southwest portion of the trip. RED-BILLED TROPICBIRD Observed only in the vicinity of the Galapagos Islands and off the coast of Mexico. RED PHALAROPE These birds were present in very low numbers throughout the trip. Several small flocks (not over 300 total) were observed around the Gala- pagos Islands. SWALLOW-TAILED GULL Two collected Two of these Galapagos-breeding birds were collected over a Wesson oil slick about 350 miles west of the islands. This may be the western- most record for this bird, as Murphy's Oceanic Birds of South America gives records only to 250 kilometers southwest of the Galapagos. DATA COLLECTING ACTIVITIES Standard EASTROPAC environmental data concerning weather, productivity, plankton, micronekton, temperature and salinity with depth, and chemical nutrients was collected. In addition, air samples for CO2 determinations were taken, and current studies were carried out on the equator.