Area of Study.- Water masses.- Cape Horn current.- Malvin current.- Coastal Argentine waters.- Area influenced by the R?o de la Plata.- Coastal waters of Uruguay and Southern Brazil.- Benthic foraminifera provinces.- North Patagonian subprovince.- South Patagonian subprovince.- Malvin subprovince.- Summary of Benthic Foraminiferal Investigations in the Area.- Principal Factors Influencing the Benthic Foraminiferal Distribution.- Salinity.- Euhaline foraminifera.- Hypohaline foraminifera.- Fresh water foraminifera.- Salt marsh foraminifera.- Temperature.- Depth.- Water mass.- Systematics and Distribution.- Euhaline species.- Hypohaline and fresh water species.- References.- Plates.- Maps.Springer Book Archives