Semicassis pyrum

{{Short description|Species of gastropod}}

{{Speciesbox

| image = Semicassis pyrum (top).JPG

| image_caption = A shell of Semicassis pyrum, lateral view

| genus = Semicassis

| species = pyrum

| authority = (Lamarck,1822)

}}

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.

Image:Semicassis pyrum (base).JPG]]