-8- Townsend Shearwater (Puffinus puffinus auricularis) A very abundant shearwater in the seas around the Revilla-Gigedo Islands. In March they were found farther north than in February, but this form probably has a limited pelagic range. Black-vented Shearwater (Puffinus puffinus opisthomelas) This sub-species inhabits the cold California current, breeding on islands along the Baja Coast. It is readily identified from the predeeding form by its larger size, brownish back and dark flanks. Dark-rumped Petrel (Pterodroma phaeopygia) Dark-rumps were found regularly in the equatorial counter current at 112°W. These birds appeared rich brown dorsally, differing from the single sighting along the equator which was sooty black above. It is remotely possible that the northern population is P. p. sandwichensis from Hawaii. The southern bird was almost definitely P. p. phoeopygia from the Galapagos. Juan Fernandez Petrel (Pterodroma externa externa) The scarcity of Juan Fernandez Petrels sightings along the rich counter currents is indicative of birds remaining on their non-breeding grounds during the breeding season. Most Juans appeared in bad molt with occasional individuals showing large white patches on the dorsal surface of their wings. These white patches were so pronounced that they gave me a first impression of being Daption. Mr. Heiden also observed this phenomonon on the Rockaway cruise. Tahiti Petrel (Pterodroma rostrata) Although this species is very difficult to separate from Phoenix Petrels, both individuals observed this trip came close enough to be positively identified. Factors making identification possible were: large size, worn light brown plumage, and massive bill-small head appearance. I believe that I saw a couple during nocturnal observations but listed them as Pterodroma sp.