EXPLANATION OF PLATE IX. 
. 1. Niso, sp. Vertical section of a species from the Tertiary beds of 
Muddy Creek, Victoria — x 3. 
2. Niso (Vetotuba) brazieri, Eth. fil. Portion of a specimen, partly 
in relief and partly in broken section, showing the umbilical 
tube. 
3. The same. Specimen with ten whorls. 
4. Cyclonema australis , Eth. fil. Portion of an individual showing 
the general features of the species. 
5. The same. Portion of the surface ornament — x 6. 
6. Oriostoma northi, Eth. fil. Upper view of a nearly complete 
specimen. 
7. The same. View of the back. 
