4G 



EXPLANATION OF PLATES. 

 Platk I. 

 Fig. 1. Obsidian button, from near Coolgardie, Western Australia. 



Fig. 2. Do. do. Reverse. 



Fig. 3. Do., from Thomas Plains, Tasmania. Convex surface showing 

 annular beading and pittings. 



Fig. 4 Do. do. Flat surface with beading, and rounded central area. 

 Slightly eularged. 



Fig. 5. Do., from Thomas Plains, Tasmania. Abnormal form, appa- 

 rently drawn out in viscid condition. 



Fig. 6. Do. Reverse. 



