This species (found 30-08-2019) is more likely to be an Okenia species accrding to Marta Pola, when she gets the specimen all will be revealed.
Bob Burn has seen these latest photos and doesn't think they are Okenia because of the 2 protuberances he thinks it is something else.
Previously this was called Goniodoridella sp. 4. Gosliner et al. have said Goniodoridella species have smooth rhinophores.

Below: The two protuberances on the anterior end could prove to be something else. Bob Burn