JOURN. ACAD. NAT. SCI. PHILA., 2ND SER., VOL. XVI PLATE X 
/IT.L.BAMER: 
MESH-SPACERS. “THE INDIAN KNOLL.” 
A, SL DUNT. BUR. NO. 20; B, BANDED CLAYSTONE, BUR. NO 161; C, CHALCEDONY, BUR. NO. 163; D, GRANITE, BUR. NO. 115; 
E, QUA BUR. NO. 82; F, GNEISS, BUR. NO. 259; G, SILICIOUS аты; RESEMBLING JADE, BUR. NO. 216; H, COARSELY 
CRYSTALLINE ROCK, BUR. NO. 87, I, SILICIOUS ROCK, BUR. NO. 67. (FULL sıze.) 
