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 
 

Category:Cassidae
Category:Taxa named by Jean-Baptiste Lamarck
Category:Gastropods described in 1822