Small, round, brown egg 'sacks' on ground

Small, round, brown egg 'sacks' on ground

Observation - Small, round, brown egg 'sacks' on ground. Description: Egg 'sacks' (?) found on soil near the base of my corn plants in the garden. Found this morning after heavy rain, but they may have been there for longer. Location is South East QLD, Australia. Sacks are small (pictured with thumb for scale), approxim

Egg 'sacks' (?) found on soil near the base of my corn plants in the garden. Found this morning after heavy rain, but they may have been there for longer. Location is South East QLD, Australia.

Sacks are small (pictured with thumb for scale), approximately 3-4mm in diameter. They are brown and appear to look rather spiky. Enclosed are grey, slimy eggs (a few eggs per 'sack').

Thank you in advance! :)