Mound A was erected on an alluvial terrace of Big Cypress Creek for the purpose of covering a grave. Prior to construction of the mound approximately a foot of humic topsoil was dug away from the surface of the terrace at the selected spot. A shallow grave was then dug in the excavated area, the body was placed in the grave along with two pottery vessels and an arrow point, and the mound was formed over the grave. When the basal portion of the mound was in place, the work was halted temporarily while a fire of considerable intensity was kindled on the incompleted mound—perhaps for ritual purposes. After the fire had been extinguished work on the mound was resumed and brought to completion. The presence of artifacts in the sub-mound Zone IIb formation indicates that the surface of the terrace in the Mound A area had been lightly occupied prior to construction of the mound. The fill of the mound contained artifacts similar to those in the sub-mound formation, but also contained burned bone scraps, mussel shells, and fragments of charcoal in some quantity. This circumstance shows that the soil of which the mound was built came from a more intensively occupied area than any discovered in the terrace around or under the mound. The source of the mound soil was not determined. Mound B This low, approximately circular mound was located on the floodplain of Cypress Creek, about 125 feet south of the stream channel, at the south end of the lake (Fig. 1). A shallow depression about eight feet across lay just southwest of the mound, and a similar but smaller depression was recorded at the northeast edge of the mound. These features probably are borrow sources. An intrusive pothole, located near the center of the mound, was three to four feet in diameter at the surface, but fortunately it proved to be quite shallow and damage to the mound was slight. The maximum diameter of Mound B, measured north-south, was 55 feet (Fig. 4), and the mound reached a maximum height of 2.8 feet above the floodplain. Mound B was staked for excavation with the usual grid of 5-foot squares oriented on magnetic north. The base stake was 100 feet south and 100 feet east of the approximate center of the mound. Excavation was carried out by the quadrant method as previously described, the southeast and northwest quadrants being excavated first, the southwest and northeast quadrants last. Each quadrant was taken down by ½-foot levels which were keyed to the vertical reference datum. In addition to work in the mound itself, the area immediately south of the mound was tested by means of trenches (Fig. 4). The trenches were dug in ½-foot levels measured from the surface of the floodplain at each square. The excavating and recording methods used at Mound B were generally the same as described for Mound A. STRUCTURE OF MOUND B