This nudibranch is fascinating to watch, particularly if it has been threatened off its perch on the eelgrass or kelp beds.  It will dance, moving itself back and forth and up and down the water column, sometimes just resting as the tide carries it from one home to another.  These animals are so translucent that their nervous system and intestines can be entirely visible.  I have come across years where they are so plentiful that hundreds have been seen in one eelgrass bed — their yellowish, white and orange ribbon-like eggs twisted like beautiful decorations. In other years, not a single one will appear.  They smell like watermelon when held or taken out of the water — though I don’t suggest doing this.  They will drop their cerata if at all threatened.