Journ. Nat. Hist, and Sci. Soc., W.A. Vol. V. Plate XX. 
Fig. 4. 
Fig. 6. 
Fig- 5- 
Fig. 8. 
Fig 7- 
Fig. 9. 
Fig. 13. Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. IS. 
Fig. 1. — Normal Lens Shape, with sharp circumferential Ring. 
Fig. 2. — Lens showing Line of Fracture of Ring on upper side of the ring. 
Fig. 3.— Lens showing a portion of Ring attached, and other portions of the 
Ring, both showing Line of Fracture and complete, as in Fig. 1. 
Fig. 4. — Button form from South Australia showing the Conical Shape of 
the Core. 
Fig. 5. — Button form from South Australia showing the Conical Shape of 
the Core. 
Fig. 6.X 
Fit' 8 C Upper and lower Surfaces of Buttons after W. Dunn. 
Fig. 9- ' 
Fig. 10. — Exaggerated Conical Shape showing long Fracture Facets. 
Fig. 11. — Normal Conical Shape showing long Fracture Facets. 
Fig. 12. — Highly glazed Conical Shape showing little trace of Fracture 
Facets, probably caused by the bubble bursting high in the 
atmosphere and the consequent air friction can-ring excessive 
fusion of the surface. 
Fig. 13 — Oval Lens Shape showing sharp Longitucinal Curve. 
Fig. 14. -Lens Dumb-bell showing Longitudinal Curve. 
Fig. 15. — Flat Conical Dumb bell showing Longitudinal Curve. 
Fig 16.— Deep Conical Dumb-bell showing long Fracture Facets and Longi- 
tudinal Curve. 
Fig. 17. — Dumb-bell that has evidently been in a fire and exhibits the 
chipping of the surface caused by sudden heating. 
Fig. 18. — Large Dumb bell showing very slight Longitudinal Curve. 
