I found 2 of these interesting slugs under fallen branches in damp riparian. Maybe it's something super cool like Hesperarion.

Notes:

-seems to have a keel on the back, though its subtle.
-pneumostone very small.
-sole white
-they move in a side-to-side motion, retracting and extending each eye independently as if they were performing some cheerleading dance
-they do not hunker down when disturbed, easily departed from surfaces, however they are very sticky, particularly at the tip