Feb. 13 Left Berkeley about 2:00 PM w Marianne. Drove to Martin's via Soffette and Pleasant Hill. Spent about an hour looking over the nearby salt marshes. The area directly north of Martin's appeared very wet, the vegetation being rushes. It seemed unsuitable for small mammals. Marsh 1/2 mi. N.E. of Martin's were inaccessible because of intervening oil refineries. The marsh area along the Martin's-Avar road 1.5 miles from Martin's (E.N.E.) posted north of the road and heavily grazed south of the road. Traps were set in the marsh area 2.4 mi. E.N.E. of Martin's. This marsh stretches along Lucien Bay for about 5 miles extending inland less than 1 to 2 miles. In the area were 1 set traps Salicornia was the dominant vegetation. This area contained several drainage ditches. The earth dug from these furnished higher land that was covered with a variety of vegetation a grass with leaves in thick clumps being the most abundant. At this time the vegetation was almost all dead. Only occasionally did we see individual Salicornia have fresh growth. The adjacent high ground is grass, heavily grazed & a few scattered bushes and trees. A dump in located about 0.3 mi East of the area trapped. Minty traps were set forty five were set along the higher ground bordering the ditches. The other 45 traps were set in the pure Salicornia which in some places had shallow (7"-1") water over it. Debris in the Salicornia indicated that exceptionally high tides flooded the area. Three marsh hawks (1 & 2 DD) were seen hunting over the marsh. Song sparrows were seen commonly in the higher vegetation. A flock of 8 Greater Yellowlegs flew overhead. Feb. 14. Left Berkeley at 7:00 AM. The traps from the ditch yielded 17 Reithrodontomys raviventris halocetes, 6 Mus. The other traps yielded 6 Reithros and one Mus. Returned to Berkeley by 9:20 A.M. Feb. 15 Left Berkeley at 10:20 AM. The traps from the ditch yielded 17 Reithros, 4 Mus, 3 Microtus californicus, & Songe. Those from the Salicornia 13 Reithros, 2 Mus, 1 Sorex.