REFERENCE: ''Pacific Coast Pelagic Invertebrates'' by David Wrobel and Claudia Mills
Note: This source had an error which was pointed out to us by Moira Galbraith of DFO:
"I think that your video in the Race Rocks portion of the website is actually of Corolla spectabilis. The 12 mucous glands on the anterior lateral borders of the wing plate are a species characteristic; C.calceola will have 18. Also according to Carol Lalli, only Corolla spectabilis occurs in the eastern Pacific.
See http://faculty.washington.edu/cemills/ActaErrata.html for an update.