Dolabrifera dolabrifera
The photo on the left was identified by Erwin Kohler from Medslugs. The quality of my photo's not very good, but it probably is Dolabrifera dolabrifera. I found this guy in a tide pool. You can tell that it is an Aplysiidae from the distinctive rhinophore and oral tentacle pairs.
The photo on the right was identified by Yolanda Camacho.