Zigs and zags

I've been working on some photo organization today (long overdue!).  Here are two beautiful chitons that I haven't had a chance to share yet:

 

 

These chitons were photographed in the low rocky intertidal zone on 22 January 2019.  They both appear to be in the genus Mopalia, but I'm not sure which species yet.  (If you have any ideas, let me know!)