False Cowries,  family Ovulidae Fleming, 1822 

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Calpurnus verrucosus

Cuspivolva formosa

Cuspivolva tigris

Dentiovula sp. 01

Diminovula alabaster

Diminovula culmen

Diminovula margarita

Ovula ovum

Phenacovolva gracilis

Phenacovolva rosea

Primovula panthera

Primovula rosewateri

Prionovolva brevis

Prosimnia semperi
Species of the family Ovulidae Fleming, 1822 are sometimes mistaken for seaslugs, especially when the shell is covered by the large colourful mantle. Let me quote Bill Rudman:
"One easy way to separate snails from slugs is to look for their eyes. If they are raised from the skin like this then they are a snail. If the eyes are embedded in the skin they are an opisthobranch."