Really need to see if the shell has an umbilicus or not. If it does not have an umbilicus it will be Isidorella hainesii. If it has an umbilicus it will be Isidorella newcombei. Isidorella newcombei is found more in far western NSW and Isidorella hainesii in the east. This shell more resembles Isidorella newcombei by its globose shape however the ACT location does not agree with Isidorella newcombei
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