22 1 E. J. Dunn.- 



Fig. 4 shows still further development; the core became enlarged,. 

 and tlic rim became more strongly developed before the glass lost 

 its viscosity. 



Fig. 5. This example has bee'n broken across, but enough re- 

 mains to show the core much enlarged, and the rim to have become- 

 much more like that of normal australites, while the proportions of 

 the rim to the core approximate more nearly to these found in 

 normal australites. There is one feature, however, in this example- 

 which differentiates it from the usual forms, and that is its thick- 

 ness, which is only H millimetre, and quite out of proportion to its 

 diameter (15 millimetres) as eonipared with normal types. Although 

 go thin that the alass is nearly transparent, there are the usual 

 rudely spiral ridges on the underside. Comparison of the above 

 tortus with normal types of australites leaves no doubt as to both 

 being formed in the same way, though in the case of those now 

 dealt with conditions seem to have prevailed which caused some 

 modification in their forms, for they are exceptionally thin as com- 

 pared with their diameter. All the above examples evidently 

 reached the surface in a rigid condition, though in different stages 

 of development. Possibly this may have resulted from the varying 

 distances above the surface at which their careers began. Rapid 

 rotation would he necessary to produce such forms before rigidity 

 set in. 



Fig. 6 shows a deformed example. It was apparently in an early 

 stage of development (between Figs. 1 and 2) when it reached the 

 surface in a semi-plastic condition, with the result that impact 

 with the soil or some hard object caused an interference Witt) its 

 symmetrical form, and distorted it as shown in the plate = 



Fig. 7 shows a symmetrical ovoid form, with a centre or core less 

 tegular. It belongs to one of the aberrant types such as occur in 

 the larger australites. It is quite symmet rical at its periphery, and 

 evidently has not had its shape interfered with by impact with 

 another body, hut may have resulted from rotary action. 



Fig. 8 is remarkable as being cup-shaped, and is the only example 

 the writer has seen approaching this form,. In its present state 

 ''"• 'up has been ilattened. This also appears to he an example 

 ,llir reached the surface while still in a semi-plastic condition, with 

 ,l; '' I'esull that it collapse. 1 on its side when it came in contact with 

 the ground. 



Ki '- r ■' is the smallest of the series, weighing drily .'2044 gram- 

 It is deformed like Fig. (i and apparently reached the earth in an. 

 ,:!llv stage of formation and while still semi-plastic. 



