Pi Pi Shells

1. Ancylocerapina

The Ancylocerapina were a coretra suborder of ammonitea, evidently related to the sub-order Lypouatina

Fig Y Half Shell

Fig X Open Sleeve

Fig Z Innards Cavity

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2. Fig Y Half Shell

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3. Fig X Open Sleeve

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4. Fig Z Innards Cavity

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Information from Wikipedia: Paphies australis or pipi (from the Māori language) is a bivalve mollusc of the family Mesodesmatidae, endemic to New Zealand.

Classification

Species deltoides

Genus Donax

Order Veneroida

Class Bivalvia

Phylum Mollusca

Kingdom Animalia

Size Range5 cm

This is one of the most common molluscs encountered on Sydney’s ocean beaches. The Pipi lives only a few centimetres beneath the surface and uses its muscular foot to burrow into the sand

You can read more about it here