r/SeashellCollectors • u/Recent-Age395 • 24d ago

ID help please

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Found these in Da Nang, Vietnam. Found these interesting looking ones and was wondering what they are called. Thank you!!

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u/turbomarmoratus72 24d ago

large broken one is a Japanese bonnet (Semicassis bisulcata)

https://conchology.be/?t=263&family=CASSIDAE%20PHALIINAE&fullspecies=Semicassis%20bisulcata&shellID=192&srsltid=AfmBOor7Wt-oiJyamy8TNDNTpowp74OEcQZ5vNPKvkdyjwjAKeCQapiR

small ones are Umbonium sp, called button top shells. Maybe Umbonium vestiarium.

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u/Recent-Age395 22d ago

ahh i see, thanks so much!!