Information authenticated by Dr Keith Hiscock of the Marine Biological Association of the UK: http://www.mba.ac.uk/
Glossary
Larvae: stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Polyp: typically sedentary soft-bodied component of cnidaria (corals, sea pens etc), which comprise of a trunk that is fixed at the base; the mouth is placed at the opposite end of the trunk, and is surrounded by tentacles.
References
Hiscock, K. 2000. Pink sea fan, Eunicella verrucosa. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. (November, 2001) http://www.marlin.ac.uk/species/Eunicellaverrucosa.htm