Scientific name: 
Metridium senile/Metridium farcimen
Distinctive features: 
Thin, fluffy tentacles.
Size: 
M. giganteum max. 3 ft. high, M. senile max. 4 in. high
Large, aggregating, white, orange, tan, or brown anemone. M. giganteum has up to 200 translucent tentacles. It is larger than M. senile. M. senile has fewer than 100 short tentacles. Both are monitored together in survey program.