OCEAN WATER TYPES Although the writer is not well versed in oceanography, the following discussion is attempted because the effect water types have on bird dis- tribution is well known. Before any correlations are attempted a general discussion is prerequisite. Probably the most graphic water type surveyed on this cruise was the North Equatorial Countercurrent. Although I am not certain of the boundaries, some of the oceanographic data suggest that on the western leg of the cruise the north boundary was at about 14°43'N - 119°10'W. In this area there was a significant change of salinity and also the writer observed "a line of marked current activity" at about 1735 hours (local-+7) on 22 October. The southern boundary of the North Equatorial Countercurrent was also indicated by a line of marked current activity. Oceanographic data also substantiated this observation with marked salinity and temperature changes having been recorded at 03°59'N - 119°10'W. Travelling eastward and then north along 112°10'W, the southern bound- ary of the countercurrent was again visually observed as well as substant- iated by oceanographic data at 04°53'N. The northern boundary was not visually observed, and oceanographic data as available at present do not make the boundary unquestionably clear. However there were rather marked salinity and temperature changes near 15°N - 118°W. Whether this was the countercurrent boundary or some other water type is not clear. Avian changes, however, suggest that it may have been the boundary and it is considered as such in this report. On the remainder of the cruise the countercurrent boundaries were not visually observed. Oceanographic data suggested boundaries near 11°N and between 1° and 2°N along 105°10'W longitude, and was somewhat confused along 098°W. These unclear definitions in the eastern portions of the survey area are not surprising as it is near the terminus of the North Equatorial Countercurrent and is also near the area where the eastward moving equatorial undercurrent breaks and diverts in the vicinity of the Galapagos Islands. Thus with the data available to the writer at present the water type boundaries in the eastern areas should remain indefinite. COASTAL WATERS The survey area along the Mexican coast between Manzanillo and Acapulco is separated for discussion purposes only, and is probably incorrectly con- sidered a single water type. The oceanographic data collected on three five-hundred mile transects through the area are confusing and suggest several influences with upwelling probably being major. Along the central and northern Baja coastline the California Current is without doubt the major influence. Although few oceanographic data were collected, the junction of the Current and southern water appears to have been off Magdalena Bay where high seas, high winds, and spectacular numbers of animals were recorded.