Hooper, 1937 1 mi. W. Avon (Salt marsh), Contra Costa Co., Calif. Feb. 28, on occasional growth of Typha in low-lying marshy places (this growth indicating that the water is not too saline - Pacheco Creek probably supplying some fresh water) and Spartina on the higher ridges. The Salicornia is quite brown and superficially dead; however, near the bases of many plants new growth is appearing. On the south side of the S.P.S.F. & New Orleans line-tracks and at places on the north side - particularly along slough channels, a coating of oil covers soil and vegetation. Here, as at Giant, mammal sign is abundant - Microtus run- ways, droppings of meadow mice, harvest mice, some carnivore drop- pings which contained a very high percentage of bones and fur of small mammals. Steel traps were found set for raccoon and mink. The owner of the traps stopped this morning when we were collecting our mouse traps; he reported he had taken 12 mink from that region during the past year.