Is this Miffy's underwater lovechild?!

These photos were taken in the Red Sea's Aqaba Straight near Taba. The bottom image gives a sense of scale - it was about 1cm long. Anyone have any ideas on ID?

Here's another photo:

Yup, sea slug although not a nudibranch. It's a shelled cephalaspidean called Haminoea cyanomarginata. Cute little thing.

Cool, thanks!