108 
PACIFIC SCIENCE, Vol. XX, January 1966 
Norrisia 
norrisii 
Egregia 
33.9 
Lominoria 
30.0 
Macrocystis 
29.1 
\ 
P t erygophora 
8.9 
E isenia 
12 4 
Gigart ina 
2.3 
Cystoseira 
1 .9 
WSD = - 15.4 
Strongylocentrotus f ranciscanus 
WSD « I 1 7.2 
Pugettia producta 
Laminaria 
Cystoseira 
I 3.0 
5.5 
E isenia 
2.6 
Gigartin a 
0.0 
WSD = * 17.4 
Strongylocentrotus purpuratus 
Macrocystis 
75.5 
Laminaria 
56.0 
Gigartina 
4 4.9 
Egregia 
35.1 
E i s enia 
30.0 
Pterygophora 
29.4 
Cystoseira 
2.4 
WSD » I 2 8.4 
Toliepus nuttallii 
Macrocystis 
64.4 
Egregia 
48.4 
WSD = I 23.6 
Fig. 1 (coni .) . Differences in amounts of various algae consumed by invertebrate grazers. 
