ing out of the same structural type under slightly different adaptational conditions.
In the sheltered pot-holes where the motion of the water en masse not possible and where the total movement is comparatively less violent, one finds an altogether different flora and fauna from that in evidence on exposed reefs. Figure 14, showing the edge of a tide-pool and penetrating below the surface of the clear liquid that fills it, presents a view of two genera of Corallinaceae—Amphiroa on the right and towards the center, and Corallina on the left. Below, suffering from slight refraction, may be identified the frond of Codium mucronatum californicum.
The latter alga, a somewhat characteristic inhabitant of the tide-pools, is shown exposed to the air in Figure 15. Its size may be judged by the leaves of Phyllospadix above and the Chiton clinging to the rock.
Some of the seaweeds of Port Renfrew were difficult to gather except from the wash. Here certain large forms such as Dictyoneuron, Desmarestia, Callymenia and others were particularly abundant. Figure 16
