E. YALE DOWSEN has compiled a most useful "Annotated List of the Marine Algæ and Marine Grasses of San Diego, California" (Occas. Papers, San Diego Society of Natural History, No. 7, March 1945). This is intended primarily for the amateur, and is simplified as much as possible. Directions are given for collecting, preserving and examining marine algse, and there are also keys to genera and list of species with habitats, notes on marine grasses, a glossary of terms and a bibliography. With this little manual much may be accomplished by anyone interested in these plant groups.