204 MEMOIRS OF THE QUEENSLAND MUSEUM. 
length of each whorl were obtained measurements along a line at about 
the middle of the lower surface. The measurements of the diameters of the 
whorls were made at right angles to the line. Whorl No. 1 is that shown 
at the right-hand side of the figure. 
— 
Length of Whorl, 
(in cms.) 
Diameter of Whorl, 
(in cms.) 
1 
15-8 
2 
9-5 
22-5 
3 
9-2 
20-7 
4 
8-5 
170 
5 
6-4 
18-1 
6 
8-3 
181 
7 
7-7 
18*0 
8 
6*3 
16-8 
9 
7-5 
16-1 
10 
5-6 
16-2 
11 
7-5 
17 0 
12 
7-0 
16-0 
13 
5-4 
16-6 
14 
7-4 
17-2 
15 
4-9 
18*4 
16 
8-1 
19-9 
Break 

17 
18 
8-2 
18-8 
19 
6-9 
' 18-6 
20 
7-8 
19-8 
21 
6-0 
18-5 
22 
8-4 
20-8 
23 
6-8 
19-6 
24 
7-8 
25 
8-8 
21-2 
Composition . — Microslides have been made of the substance from each 
end and from about the middle of the specimen. These all agree in being a 
brown, calcareous sandstone with fontainebleau structure, and with the grains 
small in size, angular and composed mainly of quartz but with some fresh 
felspar fragments present. A certain amount of argillaceous matter is present 
also. This is one of the commonest rock types in the beds of the Great 
Artesian Basin. 
Occurrence . — Along two opposite faces the specimen shows a slight 
grooving. On one side of this the surface is washed clear of extraneous 
matter. On the other side of the grooving the surface is covered with a 
structureless, white, calcareous substance identical with the precipitated lime 
deposits in the normal pedocalcic soils of this region. This suggests that the 
specimen has been embedded in the ground or in the rock up to the level 
of the grooving, the coated portion being thus the lower part. This pulverulant 
lime coating has nothing to do with shell substance ; and it may be pointed 
out that nowhere on the surface of the whorls or in the impressed zone between 
them is there any trace of shelly calcareous matter. 
t 7 %J * 
