Puffinus tenuirostris. Slender-billed Shearwater. We observed this species commonly in the vicinity of the Aleutian Islands on the Bering Sea side. The most southerly of our records was 50° 38'N 172° 51'E. Upon our return to the Adak area on 19 October we observed only five, indicating the southward migration was nearly over. Pterodroma inexpectata. Scaled Petrel. Several observed on the Bering Sea side of the Aleutians and south to 41°N. One specimen was collected at 49° 32'N 173° 00'E. Kenyon (unpublished manuscript) reports seeing several at 55° 28'N 175° 25'W which is the first report from the Bering Sea. It appears that the northwest Pacific area is one of the major wintering areas of this species. Pterodroma sp. Several small white-bellied Pterodroma were seen below 46° 52'N 173° 38'E. We collectively called them Cook's-Bonin Island as we were unable to obtain specimens. The Cook's Petrel has been taken on Adak Island in the Aleutians. Oceanodroma furcata. Fork-tailed Petrel. The Fork-tailed Petrel was seen as far south as 41° 35'N 172° 55'E. It was never very common which may reflect the difficulty in seeing it against the gray waters of the North Pacific. Oceanodroma leucorhoa. Leach's Petrel. The most common petrel in the area covered by the cruise. There is a possibility that we were also seeing some Oceanodroma castro but this could not be ascertained. Oceanodroma markhami. Sooty Storm Petrel. Petrels thought to be this species were first seen at 44° 51'N 173° 02'N and south to 41°N 173°E. It was impossible to be positive of the identifications except that they were large dark petrels. The forked tail was distinctly seen in at least