224
J. A. KITCHINQ AND F. J. EBLINQ
Fronds
Flats of stipes
U l l l U W l f I t I
50
Frills of stipes
FIa. 20. Average number of colonies of Hippothoa hyalina per plant, on fronds, flsts of
stipes, and frills of Saccorhiza polyschidea in September 1946, a8 determined by counts
from samples.
We collected boulders from all over the Rapids area as a means of
sampling the bottom and studying the sessile fauna (Lilly et al., 1953).
Of the species found attached to rocks, forty-eight were common enough
for us to examine for preferences. Of these, eleven preferred stations in
the strong current. For example, the anemone Metridium senile (Fig. 22)