Aplysia kurodai is a sea slug ! Photos of these beauties can be found on www.sea-slug.com/species/umisusi207/htm
Looking at the photos, I suppose their various protuberances could look a bit like hare's ears, hence the name.
Sea slugs have their own version of Mudcat: The Sea Slug Forum on www.seaslugforum.net/seahchem.htm
I wouldn't mind having one for a pet, anyway...they don't look as though they would be much trouble !