- Source: Semicassis pyrum
Semicassis pyrum, common name the "pear bonnet" or "common helmet", is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells, bonnet shells and their allies.
References
Powell A. W. B., William Collins Publishers Ltd, Auckland 1979 ISBN 0-00-216906-1
"Semicassis pyrum". Gastropods.com. Retrieved 16 January 2019.
Media related to Semicassis pyrum at Wikimedia Commons