In Toothacher Cove, the herbivorous snail L. littorea is commonly found in 22 densities of 192 m (P.S. Petraitis, unpublished data). All other herbivores are rare 22 22 (Littorina obtusta L., 24 m ; Littorina rudis (Maton), , 1m ; Tectura testudinalis 22 (Muller), 8 m ) (P.S. Petraitis, unpublished data)