Coggswell 1949 Journal 69 4 Big Lagoon, Humboldt Co., Calif. (SUMMARY) Aug 8-19 (cont.) and consequently the animal life over wide areas, whereas other areas are still relatively undisturbed. In the valley of Maple Creek this complication of habitats is magnified by the natural succession of river bottoms and its retardation by grazing as well as by logging & fire. The marsh at the S.E. end of the lagoon is also partly grazed. The lagoon is primarily fresh water although oc- casional high waves slop across the beach into the N. end of the lagoon. The time available for studying of the vegetation and flora did not allow gaining a full picture of the succession; but certain "associations" or "habitats" may be recog- nized. Based largely on vegetation, with consid- eration of species composition of the dominant plants only where it obviously affected the animal population, I am listing here the habitats or "associations" referred to in the species account summaries for Big Lagoon. These distribution of these associations is also indicated in a very general way on the map (p. 72 A). Coniferous Forest Formation Redwood forest 1. Sequoia sempervirens forest -- understory complex, chiefly of Swettieria shallon, Polystichum munitum, Phyllodium sp. Vaccinium parviflorum, and Lomaria spicant 2. Abies nitidensis - abies grandis forest -- extensively mixed with last, but pure on lowest slopes. Under- story similar to last + Vaccinium ovatum, Corylus rostrata, &c., Tamienia involucraria, etc.