. Bulletin. Ethnology. 142 BUREAU OF AMERICAN ETHNOLOGY [BULL 52 smoothed at the larger end by use. Three other pestles somewhat pointed at both ends are slightly flattened on one side by use as mullers. One rectangular muller with rounded corners and margins, 5f inches long, 3i inches wide, and 21 inches thick, made of quartzite, is smoothed and flattened on one face by use. SOUTHERN GROUP RIO NEGRO DISTRICT. 'sJ| .T'l Fig. 33. Quartzite muller-pestle of exceptional size and sliape. (| actual size.) Campo Fe- ral ta. The collections made by Doctor Hrdlicka in the southern area, principally on
. Bulletin. Ethnology. 142 BUREAU OF AMERICAN ETHNOLOGY [BULL 52 smoothed at the larger end by use. Three other pestles somewhat pointed at both ends are slightly flattened on one side by use as mullers. One rectangular muller with rounded corners and margins, 5f inches long, 3i inches wide, and 21 inches thick, made of quartzite, is smoothed and flattened on one face by use. SOUTHERN GROUP RIO NEGRO DISTRICT. 'sJ| .T'l Fig. 33. Quartzite muller-pestle of exceptional size and sliape. (| actual size.) Campo Fe- ral ta. The collections made by Doctor Hrdlicka in the southern area, principally on sites about the mouth of the Rio Negro, number several hundred objects, including mortars, pestles, mullers, anvils, hammers, bolas-stones, and an ex- tensive series of chipped imple- ments, unfinished chipped forms, and the refuse of chipping opera- tions. The larger implements, chiefly domestic utensils, are much like corresponding varieties to the north of Bahia Blanca. The well- specialized mortars, pestles, and mullers were shaped by the pecking- abrading processes from masses of quartzite and sandstone. Excel- lent examples of mortars made of sandstone are shown in figure 35. The numerous mullers are well-shaped and fuiished and range in form from discoidal to subrectangular outlines. Two specimens are illustrated in figure 36, a, h. A cigar- shaped pestle made of quartzite, 15 inches in length and 2^ inches in diameter at the middle part, is shown in figure 37, a. It tapers gradually from the middle to the rounded points. The surface, which has been finished by pecking, is somewhat smoothed by use toward the ends. A second specimen, made of sand- stone, 16 inches in length, is unsymmetric in shape and appears to be unfinished. It is larger at the lower end and tapers somewhat irregularly to a rounded point at the top. The fragment of a third pestle is shown in figure 37, h. An exceptional specimen is the broad blade of an axlike imple- ment, the upper portion or poll of
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