MAMMALS Common Dolphin (Delphinus delphis bairdi): 25. This species was identified in waters off the coast of southern Baja California, and may have been present as far south as Manzanillo Harbor. Spotted Dolphin (Stenella graffmani): 5. Definitely; identified only in the area of Manzanillo Harbor where a few played around the bow of the ship as it entered the harbor. Pilot Whale (Globicephala melaena): 41. Recorded in coastal waters of southern Mexico from ca. 18° to 20°N, and in the Counter- current from ca. 105° to 97°W. Sperm Whale (Physeter catodon): 1. One small (ca. 8 feet) individual drifted by the ship at 10°45'N by 104°34'W. Fin Whale (Balaenoptera physalus): 3. Three individuals were observed in the South Equatorial Current at 00°25's by 97°30'W. All were large (75+ feet) adults moving southwest. Sea Lion (Zalophus californicus): 1. An immature male Sea Lion was tentatively identified as belonging to this species as it followed the ship at 2400 hours on 22 July. The location was 03°36'N by 97°35'W. TABLE 6 gives a summary of all Mammal sightings during the cruise. TABLE 6 MAMMAL SIGHTINGS FOR EASTROPAC 30 Date Porpoise/ Dolphin Spotted Dolphin Common Dolphin Whale Pilot Whale Sperm Whale Fin Whale Sea Lion 16 June 75 0 0 0 0 0 0 17 June 30 0 0 0 0 0 0 30 June 0 0 0 1 0 0 0 07 July 200 5 0 0 20 0 0 13 July 20 0 0 0 0 1 0 14 July 0 0 0 0 12 0 0 17 July 25 0 0 0 0 0 0 21 July 0 0 0 0 0 0 3 22 July 0 0 0 0 0 0 0 23 July 50 0 0 0 0 0 0 24 July 30 0 0 0 4 0 0 29 July 40 0 0 0 5 0 0 30 July 0 0 0 1 0 0 0 31 July 50 0 25 0 0 0 0 Total 520 5 25 2 41 1 3 1