3. Slightly beveled disk like the above specimen only more refined and with more grooves. Slightly pitted on both surfaces. Grooves appear to have first been made by a sawing technique and then later smoothed down. Height, 3 cm.; average diameter, 7.3 cm. Material is volcanic tuff (pl. 23, _b_). _Stone Disks_ Discoids, like cogged stones, do not appear to have been utility items. That there may be some relationship between these two groups in a functional complex is attested by their direct association in the Banning Site as reported by Winterbourne. Eventually they may prove to be as important as cog stones in terms of cultural time-markers, though at present little is known concerning their distribution. Stone disks have been divided into two gross categories: (I) those with flat to convex faces; (II) those on which one or both faces are concave. In either group the sides may be beveled or straight (for illustrations, cf. Treganza and Malamud 1950, pl. 24, _c_, _d_, _f_, _i_). The three specimens recovered this season fall into the first group. All are characterized by flat faces and all are made of sandstone. 1. Sides beveled with the lower or larger face battered about the entire periphery. Height, 4 cm.; diameter, 6.5 cm. to 9 cm. 2. Fragmentary specimen with straight sides and slight central depression on one face. Height, 4.2 cm.; diameter, 7.7 cm. 3. Fragmentary specimen with vertical sides. Height, 3 cm.; diameter undetermined. A barrel-shaped object of sandstone was recovered which, if it is a finished product, should not be classed here as a stone disk. However, there is some possibility that it represents a discoid in the initial stages of manufacture, and as such it is without parallel in the collection. Height, 6 cm.; diameter 5.9 cm. at ends; 6.8 cm. at middle. There is no reason to assume that any of our specimens are in any way related to the so-called "bowling" stones reported for southern California in late prehistoric or historic times. _Rubbing Stones_ This class includes small flat cobbles, showing abrasive wear on one or both faces. They may be distinguished from manos by their reduced size though many appear to look like "little" manos. None shows any shaping other than through continued wear from use.