1913 ] 
Pearse: Fauna of the Rock Beaches 
Fig. 10. Purpura lapillus with One of its Own Egg Cases Attached 
to its Shell (above). General View of Same Species with its Egg 
Cases beneath Ascophyllum. 
Fig. 11 . Purpura lapillus and its Clusters of Egg Cases in Crevices 
Beneath Ascophyllum. Acmaea testudinalis in Lower Corner. 
