32 BUREAU OF AMERICAN ETHNOLOGY [Bull. 189 



Shaft smoothers 

 (6 specimens) 



These abraders consist of shaped blocks of a coarse, buff sand- 

 stone with either rounded or squared ends, convex sides, a flat grooved 

 surface, and a flat or convex undersurface. The grooves are straight 

 and are either V-shaped or U-shaped. One complete abrader is 161 

 mm. long. Another specimen, 64 mm. long, has a second grove on the 

 undersurface. The illustration (fig. 5, /) depicts a fragment with 

 a squared end. 



Grooved abraders 



(18 specimens) 



These objects are composed of a buff or rust-colored, coarse-grained 

 sandstone. There is considerable variation in size, ranging from 

 specimens no more than 75 mm. in diameter to those 175 mm. in 

 diameter. There is no consistent form; the pieces were not altered 

 in form except for the V-shaped or U-shaped grooves worn into 

 their surfaces. The grooves are of various lengths, depending upon 

 the available surface. The grooves are commonly convex in longi- 

 tudinal section. 



Faceted abraders 



(59 specimens) 



Fifty-two pieces of scoria and seven pieces of sandstone, none 

 of which exceeds 105 mm. in diameter, have been used as abraders. 

 These objects consist of irregular pieces of stone that are faceted 

 from rubbing or grinding. In some instances the entire stone is 

 smoothed, and some such stones have a superficial resemblance in size 

 and form to the bone abraders made from the cancellous tissue of bison 

 humeri. Many of the stones also bear small, shallow V-shaped or 

 U-shaped grooves. 



Beads 

 (4 specimens) 



A tubular piece of concretionary sandstone, 40 mm. long and 11 

 mm. wide, has a natural hole along its long axis. The ends of the 

 hole are smoothed (fig. 5, &). 



Two circular disks of scoria are biconically pierced. One of 

 them is 8 mm. (fig. 5, e) and the other 12 mm. in diameter (fig. 

 5, d). The latter bead is not complete, since the perforation is not 

 finished. 



A scoria bead 16 mm. long and 15 mm. wide is split down the long- 

 axis, showing that the perforation was drilled from both ends. One 

 end is ground flat (fig. 5, c) . 



