PLATE 1 
Fig. 1. A view of terrain type 1 at Pacific Grove, California. Note tide pool in foreground and nu¬ 
merous crevices. 
FIG. 2. A view of the mud bank along Bolinas Bay. Note the holes in the bank which serve P. cras- 
jvper as refuge places. Ulva lactuca is abundant about the stems of Salicornia sp. shown above the vertical 
