"slug" ID

[ctgretzky9]

Sorry, no pic, but easy to describe.
It looks like a slug of some sort. It is round to oval, all black with a small white/off white line on its back. About 1/2' long/wide if that.
Find it on my live rock only so far.
Any ideas?
Thanks!!!

 

[bang guy]

Scutus sp..
Also known as Elephant Slug, Black Skirted Limpet, Skunk Limpet, Ducksbill Limpet, etc.
Algae Grazer.

 

[ctgretzky9]

cool....thanks as usual Guy!