1948 Phalacrocorax auritus Oct. 9 - Municipal Fishing Pier, Berkeley, Calif. 10:00 + ½ hr. off - flock of approximately 250 fishing en masse just offshore S. of pier, after the manner described by Marshall. Oct. 17 - Point Richmond, Contra Costa Co., Calif. 11:00 - 11:30 - While we watched to W. & S.W. from small sandy beach opposite 100 block of Western Drive at least 15 flocks of from 5 to 40 ± birds each passed to the southward. Most of them flew very close to the surface of the water but would occasionally rise suddenly in stepwise fashion (i.e. leading birds first, followed at some location by others) to a height of 15 - 30 ft., only to drop again. A few flocks flew steadily at a 50 to 100 feet height. A single immature bird which was diving about 300 ft. off the beach was watched for several minutes. Its periods under the water averaged about 25 seconds, above water about 15 sec. or less. Dec. 18 - Tomales Bay, Marin Co., Calif. - relatively few of this species as compared with P. penicillatus. A few flocks of up to 5 or so of P. auristus were seen, as well as scattered individuals which were mixed with flocks of the other sp. The contrast between yellow lower mandible of these, & dark of [illegible] was very evident.